[PAUL K]

Originally Posted by performerrpm

after re checking, from what i measured i came up with these numbers.


[email protected]/279@050

intake open 33° btdc close at 58° abdc
exhaust open 67° bbdc close at 32 atdc

intake centerline 101.5°

the screenshot is summits calculator, and it looks to be a degree different than mine but i figure thats just error from my eyes and to close to matter. what is confusing is the exhaust centerline. no matter what i do i get 155° and 65° .050 before and after peak exhaust lift. divided by 2 gives me 110 centerline but summits calculator gets 107. when i go to 110 on the degree im at peak lift, but it also stays at peak lift right down to about 106.5° ish.

i mean i guess the small amount its off probably wont affect it one way or the other though...i hope

Looks like your doing good..... If it's still set up check the numbers fifty thousandth before and after peak lift .... Those are the ones that will tell you the lobe centerline..... It's normal to be off a number or two from the cam card

[performerrpm]

Originally Posted by PAUL K

Looks like your doing good..... If it's still set up check the numbers fifty thousandth before and after peak lift .... Those are the ones that will tell you the lobe centerline..... It's normal to be off a number or two from the cam card

i left it all set up, so im gonna double check again. seems i was able to find the center of the intake lobe easy, but not tge exhaust. but it was late too.


also, i wish i had checked sooner but while i was at it, i measure the deck clearence. looks like these pistons are .019 in the hole. so if i used edelbrocks .038 gaskets i would still have a quench of
057 which from what i read isnt good. the heads are 78cc speedmasters putting it around 10.5xx cr

do you think it will detonate on premium? or should either pull apart and shave .010 or try the .027 cometics? ive not seen any other options besides the cometics

[PAUL K]

Originally Posted by performerrpm

i left it all set up, so im gonna double check again. seems i was able to find the center of the intake lobe easy, but not tge exhaust. but it was late too.


also, i wish i had checked sooner but while i was at it, i measure the deck clearence. looks like these pistons are .019 in the hole. so if i used edelbrocks .038 gaskets i would still have a quench of
057 which from what i read isnt good. the heads are 78cc speedmasters putting it around 10.5xx cr

do you think it will detonate on premium? or should either pull apart and shave .010 or try the .027 cometics? ive not seen any other options besides the cometics

Hard question to answer.... Generally it's well worth the effort to bring that piston close to the head .... Unless it's a power adder build.

[performerrpm]

Originally Posted by PAUL K

Hard question to answer.... Generally it's well worth the effort to bring that piston close to the head .... Unless it's a power adder build.

its going in my sons 64, although he did want nitrous...i talked him out of that and gapped the rings to the tighter tolerence to match. lol i tried to talk him out of this cam as well but i guess i lost out on that. im picking up my 400 block today so i guess ill price getting it decked an weigh my free labor and decking cost to no labor and 250.00 gasket cost lol.

[Jack Ferris]

I have a Comp roller that was ordered on a 110 LSA and +4 advanced. When I degreed it, several times, it was actually-4 degrees. Never would I not degree a cam.

[performerrpm]

Originally Posted by Jack Ferris

I have a Comp roller that was ordered on a 110 LSA and +4 advanced. When I degreed it, several times, it was actually-4 degrees. Never would I not degree a cam.

jack, this cam in this thread is your old cam i bought from you....ions ago lol