engine runs funny....something isnt right

[zeroz400]

ok put a new intake gasket on it, ditched the end seals for some rtv and torqued down the intake, fired it up and got it to idle.......very rough, hooked up a vacuum gauge and it was all over the place, checked firing order again, everything looked right, re-torqued all rocker arms down still running rough, sprayed carb cleaner all over carb, and down every part of the intake, nothing.....played with the timing and it is still rough, i pulled a couple plugs and the were drenched in gas, switched carbs again and nothing.....where do i go from here?

http://www.secondchancegarage.com/public/186.cfm They got a cool little animation showing you what the guage is doing and potential reasons why. See what you find.

 

[bigbadchev84]

ok well today i threw a new head gasket at it and adjusted all the valves, before i went any further i threw the compression gauge on it and i got 150psi on the back cylinder 175 on all the others and nothing in the original cylinder i had probs with. i pulled the head back off and nothing looks wrong with it.....am i gonna need to get a new head?

 

[ryoken]

did you oil that low cylinder?

 

[bigbadchev84]

no oil, but that is probably the prob on that one, what about the dead one? if i cant see any cracks in the head does that mean its fine?

 

[78Suburban]

squirt about a table spoon or two of oil into your plug hole and do the compession test in the dead cylinder again. That will tell us alot.

 

[bigbadchev84]

im not too worried about the rear cylinder it was fine before, and the head gasket that leaked ended up not being torqued tight enough....i torqued it to 302 specs-65ft lbs and needed 351specs-112ft lbs....whoops anyways the head is off now, im just gonna go buy a new one, i have had nothing but probs with this one.