All my seaching has been confirmed here that 305 Vortecs will not flow as well as 350 Vortecs and most people suggest just to use a pair of 350 vortecs for a 350 block. My question is, is there anything that can be done to a pair of 305's that will equal if not better the 350's?

I have a 86 Camaro (primarily used for autocrossing, less than 5400 rpm) with a 350 +.020 4-valve relief stock replacement pistions, XR258HR Hyd Roller Comp cam (258/264 adv. dur and .480/.487 lift), shorty headers, Edelbrock Performer intake with a Road Demon Jr. 625 carb. CR unknown. The heads are currently 350 tbi truck heads and either 305 vortecs or 350 vortecs would be an improvement. I was given (free) a pair of 305 Vortec heads cast #12558059 1.84/1.5 valves (64cc?). Obviously I'ld have to get a new intake to use these and to swap out the springs for the ones set up for the comp cam. I am the counterman at a machine shop, and my head man can install 1.94 valves and smooth out the exhaust ports for better flow. Unfortunatly we don't have a flow bench as we don't do much performance work. What else should be done (if anything) to help the 305 heads breathe, or should I just buy 350 vortecs and start from there?

Thanks
Gary R.

 

It only took a min and I think I have the link that you would need..

Also from what I believe is a very reputable company..

http://www.carcraft.com/techarticles...rt/index1.html

http://www.carcraft.com/techarticles...rt/index2.html

http://chevyhiperformance.com/howto/97458/

http://chevyhiperformance.com/howto/97458/index1.html

http://chevyhiperformance.com/howto/97458/index2.html

Hope all of this helps...

 

Looks like port work on the exhaust is where its at. Thanks for the links..

Steven