Quote Originally Posted by Blown32
Thanks again guys for the help.
As to the large heads my train of thought was to allow the engine to breath very good even at low rpm due to the fact that I set the motor up with 9:1 static compression to start with so if the blower was to much for the street I could remove,change cam and put a new intake and carb and still have a short block with descent compression.Not my first engine build by any means but my first blower motor.
Figured if it was able to breath good it would cut down on heat and possibly get away with 9:1 to start with and prevent detonation with 93 octane pump gas.With the a 61 tooth pulley on the blower and a 55 tooth on the engine my effective compression is at 12:7.So far no detonation after 1500 miles.I know I'am not pushing alot of boost but I have the option to change pulleys and overdrive the blower and make much more power on race gas.
If I reverse the pulleys it will make about 15:1....16:1 compression and much more power but also heat.That is the reason I o ringed the block so I can overdrive and really see what power the combination will make.
I think without the blower, your low end torque and throttle response will be sluggish with the big heads because the intake charge velocity will be slow, but they will support alot of power at higher revs. As with just about every aspect of an engine build you're balancing low-end vs. high-end... big intake runners = high-end... (smaller runners = low-end)... as I mentioned before... I think the blower negates these impacts to some degree because you're forcing the charge in.

-Chris