Thread: Heads for SBC

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Need some different input on what heads are best for my 305. So many different ones out there that it's tough to decide. I'm looking for about another 30-40 HP. Mine are stock but have been ported

I'm thinking GM performance head meant for a 305. Most other heads have chambers starting at 64cc and working up from there. Most 305 heads are in the55to 58cc range. Hope this helps, Hank

Originally Posted by chevy 37

Need some different input on what heads are best for my 305. So many different ones out there that it's tough to decide. I'm looking for about another 30-40 HP. Mine are stock but have been ported

What is the max. rpm's you are going to turn the engine?

Eric has the right question. But let me say,,,if this is a street 305,,,I can give you references,,,that say to go with the 416 or 601 ,,,305 head.They flow as well as some 350 heads,,,,unless you are willing to pay $$$! One more note,,,you will get "bigger is better" here! hogwash

I was surfing around for you and came across this build. It looks like the intake runners are a little large, but it made good power and wasn't that far off the mark with max torque at 4,500.
http://www.popularhotrodding.com/eng...engine_blocks/

Originally Posted by techinspector1

I was surfing around for you and came across this build. It looks like the intake runners are a little large, but it made good power and wasn't that far off the mark with max torque at 4,500.
http://www.popularhotrodding.com/eng...engine_blocks/

Richard is correct.
I have seen very few 305's that need more than a 165 cc port volume.

Thanks Erik, yeah, I use the rule of thumb cubic inches times 0.5 for intake runner volume for a basic street motor.

My 305 is a 303 HP engine and with better heads I know I can improve on that even with the stock ones ported. Max. rev is 5500 rpm. Overbore is .060 and its got a mild cam of 218/224 @.050. Dave thats an interesting article. Will look into that further. Thanks all for your input.