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 .. 3.42 posi fact s10 disc brake rear end.. caltracs.. 275/60/15 Nitto Extreme 555 drag radials
XXXXXXXX
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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 .. 3.42 posi fact s10 disc brake rear end.. caltracs.. 275/60/15 Nitto Extreme 555 drag radials
XXXXXXXX
I use a rag as an 710 cap
 
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Joined: Wed Aug 05, 2015 9:35 pm

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
385
700r4
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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
92 S10 Ext cab
385
700r4
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