[Chevy454]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JRSully</div><div class="ubbcode-body">Those '70 569 pancake intakes aren't as bad as everybody thinks and I think this has been hashed about in another thread. Interesting concept on retarding the cam 6 degrees and bumping timing to 40.? Might be time to shelf the orig engine and build that CE block I got laying around... </div></div>
Search this site for &quot;compression map&quot;...that is how you propertly determine your cam timing [particularly IVC]...ignition timing is determined by burn rate [chamber design, port velocity, dome height/design, etc], ie, the slower the burn rate the more ignition advance you need.

Just for grins, I've attached a dyno sheet from last week of our Pure Stock L72...stock untouched intake/exhaust manifolds, Crane blueprint Gm143 cam [retarded 6 degrees]. There's a slight *lull* down low where the carb is transitioning, but we're running out of time so it will just have to do.