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electricjohn

Exhaust manifold bolts

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electricjohn

Knowing that GM engines a notorious for loose exhaust manifold bolts, I checked mine today and found that they were quite loose. Using a torque wrench they were only tightened to 15 lb/ft. Specifications say they should be at 30 to 35 lb/ft. Each of the 16 bolts took about a half of turn to get back to spec.

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jgouveia3

interesting. i just replaced my manifolds and risers and it took me about 4 hours total to grind all the manifold bolts off that where corroded away and instantly rounded when i tried to remove them.

next time i will swap with you :)

Edited by jgouveia3

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electricjohn

Put some Fel-Pro C5 anti seize lube on them. Never had a salt water seize problem using it. Makes prop removal easy too.

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jgouveia3
Put some Fel-Pro C5 anti seize lube on them. Never had a salt water seize problem using it. Makes prop removal easy too.

its got it on them now. unfortunate thing is they come from the factory with nothing on them. so if you wait until you need to replace them like i did, then you run into that problem...

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Pistol Pete

FWIW,

I took John's advice and checked all my bolts yesterday, got about a 1/4 turn out of them at 450 hrs.

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electricjohn

I was just under 200 hrs. with 5 summers on the engine.

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