Bigger Rockers, how much more lift?
Thread Starter
Member
Joined: Jan 2003
Posts: 144
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From: Louisville, Kentucky
Car: 1991 Camaro Z28
Engine: TPI 350
Transmission: 700R-4
Bigger Rockers, how much more lift?
Gross Lift Int./Exh.
.452
.465
I will get that number with 1.5 rockers and now i have 1.52 so what will be the lift now?
.452
.465
I will get that number with 1.5 rockers and now i have 1.52 so what will be the lift now?
Moderator
Joined: Jul 1999
Posts: 17,273
Likes: 171
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
gross lift divided by old rockers times new rockers
.452 / 1.50 x 1.52 = .458
.465 / 1.50 x 1.52 = .471
Aftermarket rockers are very accurate. The 1.52 would by +/- .005.
Factory stamped steel rockers rated at 1.50 could be anywhere between 1.45 and 1.55
.452 / 1.50 x 1.52 = .458
.465 / 1.50 x 1.52 = .471
Aftermarket rockers are very accurate. The 1.52 would by +/- .005.
Factory stamped steel rockers rated at 1.50 could be anywhere between 1.45 and 1.55
Moderator
Joined: Jul 1999
Posts: 17,273
Likes: 171
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
A more accurate way is to get the cam lobe specs. If the lobe spec says .300 then that times the rocker ratio is the exact lift.
.300 x 1.52 = .456
.300 x 1.52 = .456
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