bryan1984

Just wondering what you all have seen on actual flow #s that have been achieved. From porting the old oem. cast iron rectangle port heads. Trying to figure out what the max is everyone has seen. Was told there was a head porter that achieved 460 cfm on them but thought that was just a bit high.

LS1MCSS

iTrader: (18)

What motor would these heads have been on, from the factory?

bww3588

iTrader: (49)

No cast iron rectangle port heads on gen 4 engines. Are you talking about BBC heads?

bryan1984

I know they came on the 427 vet and i think some camaros. Think 1st year was 65 or so. I could be wrong on that tho.

bryan1984

Yes BBC heads. Think i posted in wrong spot. Sorry

bww3588

iTrader: (49)

No prob. Even in the small/big block section of this forum, answers will be few and far in between. Try a big/small Chevy specific site. I'm sure you will get better answers there.

Lonnies Performance

iTrader: (16)

Stock rectangle BBC heads flow about 315 I /200 E at .700"
There were many different castings & flow variances over the years.

Do a search on rectanble BBC head flow & you will be reading for hours.