Cam phase suggestion advice

yellow rose said

Unless that piston has NO valve notch, you have something wrong.

There ain’t no way in all of hell with under .500 lift that valve should hit the piston. Not even close.

So something is really wrong, unless I don’t know what Lunati “702” you have, which is possible.

FWIW, I never regard a cam. Ever. You will gain some intake P/V clearance, but you give up way too much closing the intake valve later.

If you are worried about CR and detonation then call a cam grinder and buy a custom cam.

And keep the engine temp at 180 and no more. 170 is better and 160 is better yet IF you don’t need a heater.

Click to expand...

They are the factory flat top pistons, and the cam is installed dot to dot however checking this showed it in a 2 degree retarded position which I'd like to correct. I would have thought this cam would have been fine too as far as p/v clearance, but surprisingly it's not. I was a little surprised and checked it a few times to be sure. The pistons and bores are in perfect shape and being a budget build for my son he has to keep the cost down, also to buy the KB pistons with the valve reliefs are really pricey by the time they get to Canada! It is the Lunati Voodoo cam #10200702 a relatively mild cam but there is interference. Getting parts up here can get expensive, I just looked up the Mr Gasket 987 offset key and to have it shipped here and with the exchange it comes out to $55...for a woodruff key which is crazy. Hence the reason my son and I are getting creative with this build.