1LE Hugger Orange

What happends to the lift and duration of a cam when you go from a 1.7 ratio to a 1.72 one ?

Crousti

Lift is increased by 1.02 x cam lift, valve accelerates faster, duration is not supposed to change ... i can't quite figure what your question is tbh

1LE Hugger Orange

Comp Cams have an ultra gold rocker set for my LS1, the stock ratio is 1.7 and theirs is 1.72 . I will be installing a LG Motorsport G5X3 cam , .600 intake and .610 exhaust lift . Comp told me that I would see .607 and .617 with their rockers . Thank you for the formula to check out their numbers . I knew that the numbers would change , but I did not know by how much .

99Bluz28

iTrader: (35)

The numbers Comp Cams gave you are correct, just rounded down to the nearest 1/1000th.

.600" valve lift divided by 1.7 = .35294", multiply by 1.72 = .607"
.610" valve lift divided by 1.7 = .35882", multiply by 1.72 = .617"

IMO, I'd just stick with the stock rockers.

1LE Hugger Orange

Thank you , I am keeping the stock rockers and installing a comp cams trunnion kit .