ok, here's the deal, i have a B16A head, ported and polished, 1mm overbore valves, Crower stage 3 cams and no valve lash.

i called crower and read a few threads on HT and they recommend grinding down the rocker arms where they meet the retainer.

after that was done, the cams and caps and all were torqued to spec, still no valve lash.

what i was thinking and saw on the old valves, was that they were ground down on the top about 1mm-2mm. has anyone encountered this problem? if so what did you have to do to make it work. or if you have an idea that would work, PLEASE give me your advice or oppinion

THANKS!!

 

sounds like the machine shop who installed your oversized valves cut the valve seats to deep. thats "IF" you got the correct valves for that head.

have them measure the installed valve spring height and i'll bet it's out of spec.

dont mess around with grinding rockers and other mickey mouse stuff.......take the head back and have the machine shop fix their mistake. (if the valves are the correct length)

 

ttt

 

what do you mean theres lash? when you losen it as far as it goes you still can't get the gauge in there? just trying to understand.

 

you are correct.

what is happening, is when the cam is torqued all the way down...ALL valves open and you cannot turn the cams easily.

we attempted to grind down the rocker arms, but that did no good.

we saw a way to fix it, butwe've never heard of anyone doing it.

it appears as if we cut the top of the valve by about 60% closer to the valve lock, it might give us enough clearence for the cam.

we tried putting stock cams in the head again and everything worked fine, but when we try putting in the 403's.....it seems that the lobes are just too damn big and makes everything too tight.

we have backed the adjustment screw all the way and we still can't get the feeler gauge in between there.

i guess the main question is.....is it safe to cut the top of the valve stem?

 

anyone?

 

You need to replace the valve seats in the head as there have been to many "valve jobs" done to the head. Cutting the tops of the valves is a "shade tree" repair, and don't forget to set the valve spring heights to the correct height or you will not have enough spring pressure. I would imagine your flow is going to be bad as the valves are now shrouded by sinking them so far.

 

Sorry I just reread your post, if you have adjustment with the stock cams then the base circle is to large on the Crowers, measure the diff. between the stock cams and the Crowers and then call them.

 

If you have a 1-2" micrometer or accurate caliper you can measure the base circle of the cam by measuring the width of the lobe from front/back of the lobe (as opposed to the nose/heel of the lobe). If the base circle measures more than 1.170 or so then the base circle is too big and you won't have room for lash.