Help with lift.
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Junior Member
Joined: Jul 2017
Posts: 23
Likes: 2
From: Maryland
Car: 1991 Pontiac Firebird Trans Am GTA
Engine: 5.0 TPI
Transmission: 4 Speed Automatic
Help with lift.
bought a pair of 083 heads today for a decent price. I have a comp cams 12-422-8 cam which I want to throw in my rebuild. The lift looks to be barely too big for the stock head. What do I need to do to accommodate for these? Here is the specs.
Cam Style:Hydraulic roller tappet
Basic Operating RPM Range:1,600-5,400
Intake Duration at 050 inch Lift:218
Exhaust Duration at 050 inch Lift:224
Duration at 050 inch Lift:218 int./224 exh.
Advertised Intake Duration:270
Advertised Exhaust Duration:276
Advertised Duration:270 int./276 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.495 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.502 in.
Valve Lift with Factory Rocker Arm Ratio:0.495 int./0.502 exh.
Lobe Separation (degrees):110
Cam Style:Hydraulic roller tappet
Basic Operating RPM Range:1,600-5,400
Intake Duration at 050 inch Lift:218
Exhaust Duration at 050 inch Lift:224
Duration at 050 inch Lift:218 int./224 exh.
Advertised Intake Duration:270
Advertised Exhaust Duration:276
Advertised Duration:270 int./276 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.495 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.502 in.
Valve Lift with Factory Rocker Arm Ratio:0.495 int./0.502 exh.
Lobe Separation (degrees):110
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