smokin87iroc

what are the torque specs on the intake manifold for an 87 TPI setup? my book says 30 but i'm not sure cuz later on it says 68 for 88 and later TPI so i just wanna make sure
thanks
Andrew

MikeInAZ

http://www.gmtips.com/3rd-degree/

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I think it's 40~45 lbs.

smokin87iroc

ok so i put it at 30 is that gonna give me problems? i really don't want to take it all off again but if i must i guess i will.
Andrew

Brett Gutshall

Should the throttle body be torgued to the Plenum? I had mine off the other day because i was going to port the plenum but then I didn't. I don't have a torque wrench so I just put the bolts on as tight as I could. Is this bad? The car didn't seem to run any different.

smokin87iroc

its like 15-20 ft/lbs on the TB to Plenum. if its tight it won't do any harm. there is no strong flex or pull on the TB/Plenum connection so its not a big deal
Andrew

rondubbs

http://www.racer-x.f2s.com/proc/torkseq.htm

follow the tpi torque sequence article to find out the correct way to bolt them down.

Guest

I wouldnt even think about torquing down an intake manifold to 68 ft-lbs, thats a cylinder head spec not an intake spec.

MikeInAZ

Smokin ~ I don't think 30# will give you any problems BUT if you ever get a code 44 Lean Exhaust check the manifold bolts first.

Proper torque into aluminum IS a big deal less' your real handy with an extractor and tap & die set.

If you're flying by the seat of your pants I've always found that resisting that last little urge to get it "just a bit" tighter........ is a good thing.

JoelOl75

Make sure to go back and re-tighten them in a week... Odds are they will only be finger tight no matter how much you tightened them down the first time...

smokin87iroc

well it wasn't tight enough for the stupid rear part to seal and it leaked oil from the intake/engine meeting point. so i get to take it off and do it again
Andrew

Guest

I wouldnt use the end seals that come in the gasket kit, dunno if you did or not. Silicone works much better, just make sure the surfaces are clean.

smokin87iroc

no i used silicone it just didn't squish the right way and got pushed out the back. it didn't get squished towards the inside keeping it in place.
Andrew