1985 Blazer V8

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Re: 1985 Blazer V8

Postby XXXXXXXX » Tue Apr 11, 2017 1:18 am

Well sounds like your "dog approved" so time to go on that trip!!

X
82 S10 Longbed.. stock 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. dyno'd 194rwhp...holley 750dp.. 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 .. 3.73 posi fact s10 disc brake rear end.. caltracs.. 275/60/15 Nitto Extreme 555 drag radials
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Re: 1985 Blazer V8

Postby ChevelleFan » Fri Jun 30, 2017 12:00 pm

Been a while since I've been here and a lot has happened since my last post..

So after getting the engine back together with the new heads, all was going well. I ended up ordering a new set of rear-axle U-bolts from JTR and putting my 3" lowering block back in with the ZQ8 rear leaf springs. The stance is now *perfect* IMO.

Image

I drove it around for a few days before heading out to Carlisle, and all was mostly good. I was having trouble getting to WOT on the carb, like it was a cable issue. It wasnt a big deal for now, I'd get it later. . I got the fans wired up to come on/off automatically using a Spal thermostatic switch to control a relay, and it works perfect. https://www.summitracing.com/parts/spu-ix-195ts

So on Sat the 21st (apr), I left the house at 6:30am, planning to get ot Carlisle in time for lunch. Well, at about 9am on the PA Turnpike, I started hearing a ticking from the engine and within a few miles, it got worse. I got off the highway and into a parking lot. Called my friends to tell them I was having problems, I pulled the valve covers to see if it was something like a loose/broken rocker, but no such luck. In the end, I called Hagerty Roadside Assistance and arranged for a tow home. Hagerty covered 150 of the 168 mile tow home.

Here's the noise it was making: https://youtu.be/HFhVxro9spo

I was fed up with it, so I washed it, covered it, and left it in the back of the garage for a couple months while I worked on other stuff. I'm finally getting back to it now. I cut the oil filter open and found some metal, so it will be coming out this weekend. I just wanna get this thing done and back together. It was supposed to be my cool daily driver this year.

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: 1985 Blazer V8

Postby XXXXXXXX » Sun Jul 02, 2017 1:14 am

Its weird ... it sounds like a rod at idle... but like a rocker when you rev it up... before you pull it... have you pulled both valve covers and check to make sure all the valves are opening and that you don't have a bad rocker, push rod, or flat cam lobe?

X
82 S10 Longbed.. stock 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. dyno'd 194rwhp...holley 750dp.. 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 .. 3.73 posi fact s10 disc brake rear end.. caltracs.. 275/60/15 Nitto Extreme 555 drag radials
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Re: 1985 Blazer V8

Postby lowblazin94 » Sun Jul 02, 2017 2:17 am

Sounds like top end. Triple check the springs. See if any can be pressed down by hand as you slowly rotate the motor.

If I were you i'd drain the oil and check for any metal. Pull the rockers and see if any push rods are bent. If you have press in rocker studs then see if any lifted. If all is good then drain the coolant and pull the intake and inspect each lifter for any unusual wear.
92 S10 Ext cab
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Re: 1985 Blazer V8

Postby lowblazin94 » Sun Jul 02, 2017 2:21 am

Nvm just saw the end of your post, phone doesnt always load.

Metal in filter then just yank it out. There could be metal in all the mains and cam could be wiped. Tear it down and hopefully something obvious pops up
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Re: 1985 Blazer V8

Postby ChevelleFan » Fri Aug 04, 2017 1:02 pm

After getting everything apart, it was definitely a spun rod -- #1 to be exact. I could rattle it with my fingers. The journal was pretty beat up too.

I've had a Goodwrench 350 in the corner that was purchased by my uncle in the 80s as a replacement engine for his '78 Truck. When the truck was eventually scrapped a few years later, the engine was removed with only about 20k miles. It's been sitting around for probably 30 yrs waiting to be used in something, probably the last 10 yrs at my house. It was time to get it out of my garage. I removed the heads and cam, installed my Lunati cam and Summit heads, along with a new oil pan and timing cover. As fate would have it, Uncle Bill passed away while I was in the middle of the swap. (he'd been declining for a while) But he'd be happy to see it being successfully used again.

It fired up immediately last night and I put probably 40 miles on it just to make sure everything was ok. So far so good! I want to get some good shakedown mileage on it, as The Woodward Dream Cruise is coming up in a couple weeks (Aug 19) and I've been hoping to take this thing up there. It'd be my third different vehicle driven to The Cruise. If you're within driving distance of Detroit and have never gone, I highly recommend it.

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: 1985 Blazer V8

Postby lowblazin94 » Fri Aug 04, 2017 1:36 pm

Did you use the cam from the damaged motor?
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Re: 1985 Blazer V8

Postby ChevelleFan » Fri Aug 04, 2017 1:46 pm

Yes. Cam and lifters all looked very good, so they were re-used. Lifters were kept on the same lobes.

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: 1985 Blazer V8

Postby ChevelleFan » Sat Sep 09, 2017 10:37 pm

Update:

So I didnt make it to the Dream Cruise, I just wasn't quite comfortable taking it on a longer journey like that with it.

Replaced the garbage Holley 600 (1850) with a Street Avenger 670 from a friend that had been on a similar 350. It runs soooo much better. Idles better, drives better, has more power. My GF and I were out cruising it on Labor Day weekend, and ended up in Erie PA, which is probably 90 miles from here. Did 180-200 miles that day and it ran flawlessly.

ImageImage
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The next major thing I need to do is change the tailpipes. They go between the top of the leaf spring and the body. They're hitting the springs and the body and rattling/squeaking like crazy.

Gonna try to hit the dragstrip on Wednesday or Friday. It's a lot quicker/stronger than it used to before I started this whole project. Time to put a number on it.

With the 350 it came with, after I improved from torker2-->performer and old crappy Mallory distributor with broken vacuum advance-->HEI w/MSD ign module, with a recurve kit. With those two improvements, the 350/TH350/2.73 produced a whopping 15.79@89 MPH, finishing in 2nd gear. Total fudging turd.

I've replaced that 350 with a different one, an 80s Goodwrench 350, with Summit Vortec heads, Lunati 219/227 HFT cam, Performer RPM AG, Holley 670 SA, a new 700R4 with Summit 2600 stall converter, and a 3.42 posi. Only problem is I can't get my shifter to give me 1st gear, so it upshifts to 2nd at 4500. I can get the shifter into 2nd, so I can run it up a little more to 5000+, then manually shift to 3rd. I bought the governor re-cal kit (wts/springs), haven't put it in yet.

Hope all you Florida guys have good cover from Irma.

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: 1985 Blazer V8

Postby lowblazin94 » Sat Sep 09, 2017 11:30 pm

Should put you a good second faster at the very least. Glad its cruising now, keep it up.
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