L88 cam in L78?

[JLerum]

Sam;

The reason you find more duration on the exhaust side of the cams are because only until recently cylinder heads big restrictions were the exhaust port. Chevy has a really good one for a stock head compaired to the other manufacturers. On a flow bench they would flow about 70% of the intake which for their time of design was really good. You will find that alot of the after market manufacturers are around 80%. To compensate for the lesser design you would hold the exhaust valve open longer to help it out. The kicker again is the longer you hold the valves open the more compression that is required to aid in cylinder filling. Keep in mind we are talking about a cam made for all out performance for the L-88 and ZL-1 cars. [img]/ubbthreads/images/graemlins/beers.gif[/img]

If you look at Buick stage 1 motors their exhaust is an extra 10 or 12 degrees. The 440-6 pak motors from Mopar also have an extra 10 degrees designed in. These are just a couple off the top of my head that I know of that com from the factory with a cam to aid the exhaust port.

JIM [img]/ubbthreads/images/graemlins/headbang.gif[/img]

Yes...........those cam numbers are off the lobe not at .050 which seems to be the standard today.