Think I found the problem
Think I found the problem After installing my heads and cam I had no power increase over stock. I was asking around about what pushrod length to use, and was told the stock length would work as long as I was within 1 to 1.5 turns from 0 lash. Well that is wrong, they are supposed to by 22 ft lb. I guess the guy thought I had adjustable rockers. The rockers are basically tightened all the way down and maybe holding the valves open. Will this cause a valve to burn? What can of damage would be possible if any?
Well, actually the lifter preload isnt too far off, but it is off. Yes you should have torwued them down to 22ftlbs, and in doing so, whould have turned the bolt about 1-1 1/2 turns. Most important part being the torque. Back them off, hand tighten with a qtr inch ratchet, and once bottomed, torque.
Originally Posted by CAT3
Well, actually the lifter preload isnt too far off, but it is off. Yes you should have torwued them down to 22ftlbs, and in doing so, whould have turned the bolt about 1-1 1/2 turns. Most important part being the torque. Back them off, hand tighten with a qtr inch ratchet, and once bottomed, torque.
If the valves are not fully closing AND opening, yes you could be down on power, but I would imagine that youd also hear it, either a ticking, rushing air, or popping. But maybe not. Redo them, takes an hour.
I m going to do them for sure, I do have some valve train noise that i didnt have before. I was told with the cam that I would get more noise. Either way they will be torqued to specs, and if there is no change I will keep searching! thanks for your in put!
Originally Posted by work in progress
After installing my heads and cam I had no power increase over stock. I was asking around about what pushrod length to use, and was told the stock length would work as long as I was within 1 to 1.5 turns from 0 lash. Well that is wrong, they are supposed to by 22 ft lb. I guess the guy thought I had adjustable rockers. The rockers are basically tightened all the way down and maybe holding the valves open. Will this cause a valve to burn? What can of damage would be possible if any?
The rocker's need to be torque'd the 22 ft/lbs to keep them from loosening,ie-falling out.So I'm sure your mechanic did it right.
I think this is what you mean-- You could possibly have too much preload causing the valves to hang open.On most H/C cars I do I install 7.350 pushrods because the Heads are shaved .030..I find the preload is arounf 1/2 -3/4 turn's=.080 preload.
So you need to find out how much preload you have,then go from there.
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Originally Posted by work in progress
The rockers are basically tightened all the way down and maybe holding the valves open. Will this cause a valve to burn? What can of damage would be possible if any?