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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2002 Posts: 2,168 A teacher, but always an apprentice. | | A teacher, but always an apprentice. Joined: Apr 2002 Posts: 2,168 | Thinking about swapping the stock lm7 cam for a comp cams 54-424-11 cam. Here are its specs:
Basic Operating RPM Range: 1,400-6,700
Intake Duration at 050 inch Lift: 212
Exhaust Duration at 050 inch Lift: 218
Duration at 050 inch Lift: 212 int./218 exh.
Advertised Intake Duration: 265
Advertised Exhaust Duration: 271
Advertised Duration: 265 int./271 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.558 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.563 in.
Valve Lift with Factory Rocker Arm Ratio: 0.558 int./0.563 exh.
Lobe Separation (degrees): 115
Camshaft Gear Attachment: 3-bolt
I am wondering what this will do to the vacuum and if it will affect a brake booster significantly?
I just want to pep this engine up a bit.
Thoughts? Critiques? Suggestions?
Thanks Bolters. I know I’m in good hands here. | | |
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