[performerrpm]

so i finally put my old 455 back together, and now im trying to time the cam. ive youtubed this process to death and i think i kinda got it sorted but figured i check my process.

1st i put #1 piston close to tdc, then set the degree wheel at 0 before bringing the piston down a bit. installed piston stop, rotated piston back up to the stop and wrote the number down which ended up 20° on the wheel. rotated the piston back the other direction and got 20° on the opposite side of tdc on the wheel. i think it was luck i got the wheel that close but i did check and double the 40° difference a couple times.

i dont have the card, i only remember i was told it was a 271/279@ .050 .426 lobe on 104 lsa. and that previously it was ran at 101.5° because that was as close to 101° as he could get.

with the dial indicator and the lobe attachment connect,i only seen a peak of .416 lift so maybe that was a typo back then on the .426 lobe but he did write it on the box too. next i put the indicator on 0 on bottom of lobe, cranked the motor over to peak lift of .426. after that i turned it .050 passed the peak lift and wrote the number down. next i turned it over to .050 before peak lift and wrote that number down. added it together and came up with 98° centerline using the 4° A key in an edelbrock gear drive. so i pulled the crank gear and went to dot to dot. and repeated the steps, came up with 101.5° centerline. i had an off brand ebay gear drive on the shelf without additional timing keys installed it and repeated the steps again, only this time my top numper was off by 1° and when averaged the 2 numbers together i got 101° thats not to say that .5° was not a margin of my piss por up close vision though. would it be safe to assume this cam has some advance built into it and my readings are right or am i missing a step?

i was thinking maybe now i should go back, measure the 1st .050 of lobe lift on each side of the lobe from the bottom instead of after peak lift and see if i still come up with the same 101°


when i use summits calculator it shows with no advance this cams centerline would be 104°