Top end problems
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Joined: Jun 2011
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Top end problems
Have 1987 Chevy Camaro and built 383 motor. 11.1 compression products. 64 chamber heads. Holley dominator highrise intake. 750 demon dp. hydraulic tap cam specs: lift 502 intake; 238 exhaust. exhaust lift 516 intake; 244 exhaust. RPM range 3250 - 6750. Auto transmission w/3500 stall 410 gears. Tire size 28" ET drag.
Car ran 12.48 @ 113mph in 1/4 mile fresh off the motor. Car started slowing down since. Car now runs 13.18 consistent. Car crossed traps at no more than 5200 RPMs in 3rd gear. Is this a cam problem? what's caused the slow down?
Car ran 12.48 @ 113mph in 1/4 mile fresh off the motor. Car started slowing down since. Car now runs 13.18 consistent. Car crossed traps at no more than 5200 RPMs in 3rd gear. Is this a cam problem? what's caused the slow down?
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Joined: Jan 2011
Posts: 446
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From: Saratoga Area, New York
Car: 1990 Formula Firebird
Engine: 305 TBI (LO3)
Transmission: WC T-5 out of an 88 T/A
Axle/Gears: 10 bolt, 3.42 & Torsen Posi
Re: Top end problems
A leak down test is pressurizing the cylinder with shop air and watching how much pressure it looses. Tells you if you have a leaking valve or bad rings or whatever.
Also have you checked the adjustment on the valves? Maybe now that its broken in something loosened up?
Also have you checked the adjustment on the valves? Maybe now that its broken in something loosened up?
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