882 heads on a 305?

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882 heads on a 305?

Postby XXXXXXXX » Mon Nov 28, 2016 2:31 pm

Does anyone know if a set of factory chevy 882 (large 76cc heads with 1.94 valves) will fit on a 305? The reason I ask I have heard you cant use 1.94 heads on a 305 as they wont clear cylinder walls?? Anybody know or have experience with this?

Thanks X
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
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Re: 882 heads on a 305?

Postby XXXXXXXX » Wed Nov 30, 2016 3:05 am

Anybody?

X
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
I have Fred Flintstone brakes
 
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Re: 882 heads on a 305?

Postby redneckgames » Wed Nov 30, 2016 8:10 am

http://www.thirdgen.org/forums/tech-gen ... -94-a.html

people have ran 305s with 1.94 valves
Brad

85 S10: 350/350 combo, Dart 200P Pro1s, 10.5:1, Lunati 40150 244/249 @ 50 .565/.543, Air-Gap, 650 DP
88 Iroc: 97 Vortec 350 w/lt4 hot cam, A4, 3.73
67 Chevelle SS: 396, 4 speed, 3.73
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Re: 882 heads on a 305?

Postby Rickracer » Wed Nov 30, 2016 9:06 am

Yes, they will "probably" fit, but I would NOT put them on a 305 unless it's gonna have something to up the dynamic compression....
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: 882 heads on a 305?

Postby XXXXXXXX » Wed Nov 30, 2016 2:27 pm

Ok thanks I will read that thread.

No I need to lower the compression.. its at about 9.5 right now and with the blower it detonates like crazy with our cheap az 91 octain and oxygenated fuel. Even pulling massive timing.. still detonates.. so I was thinking of throwing on the 882 heads while I build the 350. Wont take long to build it but its a money issue.. prob wont have the funds till spring.

X
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
I have Fred Flintstone brakes
 
Posts: 551
Joined: Wed Aug 05, 2015 9:35 pm

Re: 882 heads on a 305?

Postby Rickracer » Thu Dec 01, 2016 6:50 am

Still not a good plan, but I guess it WILL drop your compression.....
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: 882 heads on a 305?

Postby redneckgames » Thu Dec 01, 2016 2:01 pm

Rickracer wrote:Still not a good plan, but I guess it WILL drop your compression.....



At some point convenience out weighs if its the "best plan or not". Not sure I understand your post.

I know you know your stuff, but I don't see the issue with him running it based on what he has mentioned. Needs to lower the compression, will be temporary, and isn't working with a large budget. I don't see the downside if the he already has the heads or can get a super cheap set. Now if he is going to drop a lot of money into the 882s, that's a different story.
Brad

85 S10: 350/350 combo, Dart 200P Pro1s, 10.5:1, Lunati 40150 244/249 @ 50 .565/.543, Air-Gap, 650 DP
88 Iroc: 97 Vortec 350 w/lt4 hot cam, A4, 3.73
67 Chevelle SS: 396, 4 speed, 3.73
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Re: 882 heads on a 305?

Postby bgblock427 » Thu Dec 01, 2016 5:28 pm

Coming up with 7.49 CR with the 76 cc head, wont run for crap NA
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Re: 882 heads on a 305?

Postby Rickracer » Thu Dec 01, 2016 9:36 pm

Small bore - big combustion chamber - lots of dead air in there - liable to detonate even worse, even with WAY less compression. The 882s breathe so-so/ok compared to most other stock SBC heads, but the chamber isn't great at all, especially on too small a bore. You know how 906/062 Vortecs are worth up to 40 HP over other SBC heads? Well, 882s on a 305 are pretty much the exact opposite, :? :thumbsdown:
A much better plan would be to open up and polish the chambers on the current heads, match the spark plug side of the chamber to the edge of the bore, perhaps run a little thicker gasket. See the build thread on my truck for some pics of my head work, NO port work, just chamber work, starts here: viewtopic.php?f=28&t=29405&start=80 , :thumbup:
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: 882 heads on a 305?

Postby XXXXXXXX » Fri Dec 02, 2016 3:23 am

Really you think they will detonate worse than the 801 heads I have now? I have not heard that before about there being "dead" air with a small bore.. can you expand on that a little rick?

I have the 882's but if they are going to make a bigger problem than what is a good budget head that I can use that I can put on my 350 when I build it and use now for the 305? I know I know vortec.. but.. my 144 blower wont sit on those heads so.. what else? I need something with a 1.94 valve max. Also would like to keep a smaller intake running to keep the low end torque.. I will be running a summit 1103 or 1104 cam.

Thanks X
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
I have Fred Flintstone brakes
 
Posts: 551
Joined: Wed Aug 05, 2015 9:35 pm

Re: 882 heads on a 305?

Postby XXXXXXXX » Fri Dec 02, 2016 4:23 am

I wish I could run these https://www.summitracing.com/parts/sum- ... /chevrolet but my blower intake wont fit.. I don't think.

X
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
I have Fred Flintstone brakes
 
Posts: 551
Joined: Wed Aug 05, 2015 9:35 pm

Re: 882 heads on a 305?

Postby redneckgames » Fri Dec 02, 2016 6:32 am

XXXXXXXX wrote: than what is a good budget head that I can use that I can put on my 350 when I build it and use now for the 305? I know I know vortec.. but.. my 144 blower wont sit on those heads so.. what else?


If you plan on using them in the future as well, then I definately don't recommend it either. Just a waste of time and money. I thought you was looking for a temporary crutch. Save the 882s for the class circle trackers.
Brad

85 S10: 350/350 combo, Dart 200P Pro1s, 10.5:1, Lunati 40150 244/249 @ 50 .565/.543, Air-Gap, 650 DP
88 Iroc: 97 Vortec 350 w/lt4 hot cam, A4, 3.73
67 Chevelle SS: 396, 4 speed, 3.73
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Re: 882 heads on a 305?

Postby Rickracer » Fri Dec 02, 2016 6:52 am

XXXXXXXX wrote:Really you think they will detonate worse than the 801 heads I have now?


Not certain about that, but it's a STRONG possibility.... :(
Vortec and Fastburn heads work so well because the keep the intake mixture moving and churning inside the chamber, creating a more "homogeneous" mixture. The old style chambers don't do this, so you wind up with rich and lean pockets inside the chamber, which, as you might imagine, don't burn at a consistent rate. This is what causes the detonation, but it's not predictable. :wink: 8)
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: 882 heads on a 305?

Postby XXXXXXXX » Fri Dec 02, 2016 3:45 pm

redneckgames wrote:
XXXXXXXX wrote: than what is a good budget head that I can use that I can put on my 350 when I build it and use now for the 305? I know I know vortec.. but.. my 144 blower wont sit on those heads so.. what else?


If you plan on using them in the future as well, then I definately don't recommend it either. Just a waste of time and money. I thought you was looking for a temporary crutch. Save the 882s for the class circle trackers.


Well I wanted to use the 882's cause they are a large chamber (76cc) which on the 350 with piston in the hole a bit would put it at 7.8 to 8.0 compression.. I am going to run the blower on the 350 first.. then its going to get a t-76 single turbo and about 15lbs of boost.. the 882 heads flow almost identical to the chevy 461 heads up to about 5.5 lift.. so I rhough maybe I would through the 882 on the 305 since I have such a detonation problem. If you guys think the 882's are a bad choice let me know I can do something else i guess.. I just wanted something basicly stock with some boost to have some fun.. but the goal here was for a daily driver type of car. I am not looking to spend a ton of money on this combo.. more of a "let the boost" make it fun type of thing..

Thx X
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
I have Fred Flintstone brakes
 
Posts: 551
Joined: Wed Aug 05, 2015 9:35 pm

Re: 882 heads on a 305?

Postby XXXXXXXX » Fri Dec 02, 2016 3:49 pm

Rickracer wrote:
XXXXXXXX wrote:Really you think they will detonate worse than the 801 heads I have now?


Not certain about that, but it's a STRONG possibility.... :(
Vortec and Fastburn heads work so well because the keep the intake mixture moving and churning inside the chamber, creating a more "homogeneous" mixture. The old style chambers don't do this, so you wind up with rich and lean pockets inside the chamber, which, as you might imagine, don't burn at a consistent rate. This is what causes the detonation, but it's not predictable. :wink: 8)


Hey I do have a set of 193 and 801 swirl port heads... I forgot I had those till just now.. the 801's are the same as the 193 just they have a sodium filled exhaust valve so they are better for exhaust heat. Swirl ports are torque monsters.. on a 305 (ric I think you said a while back) the swirl port will flow more than on a 350.. I could put the swirl ports on the 305 with blower... then run the 882's on the 350?? What do you think?

X

edit.. also I think the swirl ports have a 64cc camber vs the 801's have the 58.. that is a guess though as I have never been able to find any specs on the 801 head other than they came on trucks and vans.. but I think the specs are the same for the 801 as the 301's. But what do think about the swirly's? A little bigger chamber and they have the famous "swirl port rramp" lol.
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
I have Fred Flintstone brakes
 
Posts: 551
Joined: Wed Aug 05, 2015 9:35 pm

Re: 882 heads on a 305?

Postby bgblock427 » Fri Dec 02, 2016 4:48 pm

Are your 882,s off a 400? (look for steam holes then look for cracks) I had a few sets and they had a 2.02 intake.

some small cc aluminum heads are the best bet for running that 144. I have built them all the way to 10:1 Cr with no or little detonation. 350 and 383's mostly.
little engines were beasts over 500hp on pump gas. I used a Howards hyd cam and canfield heads. (THIS WAS A FEW YEARS AGO)
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Re: 882 heads on a 305?

Postby Rickracer » Fri Dec 02, 2016 6:43 pm

I think if I were in your situation, and didn't want to spend any money, I'd grab those 193s, take out the swirl ramps, gasket match them, open up the chambers a bit by matching the chamber edge to the cylinder walls, unshrouding the valves, and polish the rest of the chambers a bit. It would be pretty easy to get them up to 66~67ccs with a nice smooth finish, with no swirl ramp, and the blower, they should make decent power. But like Joe said, some small cc aluminum heads would be a better solution. 8)
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: 882 heads on a 305?

Postby XXXXXXXX » Fri Feb 17, 2017 3:15 am

I though it would resurrect this thread in stead of starting a new one.. first I have given up on 882 head idea for the 305 based on comments here. I have been looking (and found) a great set of aluminum heads but couldn't buy them cause its the "slow" season here for work so.. just couldn't pop the money right now. So I am back to wondering about the swirl ports... here is the question... I know the swirl ports have poor intake flow but really good exhaust flow.. and they are torque monsters below 4500.. even though they only flow like 170 on the intake side cause of that damn ramp... the question I have is this.. wouldn't boost from the blower make them flow anyway?? So my thinking is great torque to 4500.. then boost forces the gas in... and they still have good exhaust flow.. kind of the best of all 3 worlds??

I have a set of 193 swirl and a set of 810 swirl ports I can use.. the truck now has 801 castings... I cant find any flow numbers for a stock 801 head.. the reason I am wondering about all this is a am about to order the 1103 summit cam and I am thinking if I do all that why not change the heads?? 810's? or 801's?

Opinions please.

Thx X
82 S10 Longbed.. stock 160hp 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. holley 600dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.42 posi fact s10 disc brake rear end. 275/60/15 Nitto Extreme 555 drag radials
(keeping the 600dp for now to reduce boost until I can get a larger upper pulley then going to my quick fuel 750dp)
XXXXXXXX
I have Fred Flintstone brakes
 
Posts: 551
Joined: Wed Aug 05, 2015 9:35 pm

Re: 882 heads on a 305?

Postby Rickracer » Fri Feb 17, 2017 9:55 am

I think they would be too restrictive without taking out the ramps, but I'm not positive about that, could actually work fairly well, but if it were me, I'd get the die grinder and burrs out and remove some metal chips, 8)
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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