i got my cam back from the shop after getting it dialed in to find the lift do u guys think that a .544 lift cam is too much or is perfect for my 355,will i have a problem passing inspection its gonna be a daily driver

 

Nothing wrong with that lift as long as the clearances are checked. The more more lift the better. Too much duration is what makes a cam unstreetable.

 

Do larger lift cams pull more vacuum, or is it the duration that pulls vacuum? The reason I ask is, I had some friends who put a cam with about that lift in a car and had to run a vacuum canister to keep their brakes.


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91RS convertible 355 TBI 65# inj. custom compcam grind .480/.480, Edelbrock TBI manifold, open element, hedman hedders, Y-pipe, cheap cherry bomb muffler, Hypertech cop car thermomaster, Accel coil, wires. 2.02/1.6 cast iron heads. Engine specially made by Pflugerville machine shop. Forged bottom end, balanced. Coming soon: Vacuum controlled FPR, better exhaust, Torque converter, DIY PROM, bigger TB.

 

Duration and overlap affect vacuum. Too much duration and overlap = no vacuum.

 

Realizing this probably belongs in the general engine section, what exactly is overlap?

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91RS convertible 355 TBI 65# inj. custom compcam grind .480/.480, Edelbrock TBI manifold, open element, hedman hedders, Y-pipe, cheap cherry bomb muffler, Hypertech cop car thermomaster, Accel coil, wires. 2.02/1.6 cast iron heads. Engine specially made by Pflugerville machine shop. Forged bottom end, balanced. Coming soon: Vacuum controlled FPR, better exhaust, Torque converter, DIY PROM, bigger TB.

 

post in general if you dont get your answer here. or i can move it upon request.

 

Put simply, overlap is the amount of degrees both valves (intake and exhaust) are open at the same time.

at www.compcams.com they have a great article about all that cam stuff you want to know.

[This message has been edited by madmax (edited August 15, 2001).]