As some of you know I am changing my 882's for the vortec's.I know the vortecs are a 64cc head.Can someone tell me the cc's for the 882's?Also how much of a jump in CR can I expect?I'm asking this in part because I'm thinking of switching over from my Holley 650 to a new 750 that I have had sitting in my closet for about 3 yrs.now.Also how about any jet changes should I make if this 750 is the way to go with these heads.Do I need to change the power valve.The one in the carb is a 6.5. I'm sorry.This is for a 350 that still has the stock cam.The only mods are headers/flowmasters,and an alum.intake.
For a mild 350, the 750 is probably "over carbing" the engine. The 750 can be made to run well on it with proper tuning, but the 650 will probably get you better throttle response at a similar level of proper tuning.
You should check out an article that came out in Chevy High Performance Magazine awhile back... they did a buildup of a 350 using the Vortec heads and a Comp XE268 camshaft and made over 400 horses and plenty of torque. Here's a link... http://www.73-87.com/chp/gm3505.htm
- '68 Chevy Camaro (sort of done, but always subject to improvement)
- '63 Pontiac Tempest (work in progress)
- '72 Datsun 240-Z (back-burner for now)