You guys think that one of the good 200cc intake runner size sbc heads would be too big for a 383 street motor? 1968 Chevelle hydraulic roller cam with 235 to 240 at .050 duration, 4.11 gears, TH-350, dual plane intake, 750 cfm dp,. Or do you think taht one of the 170cc to 180cc size heads would be better? This is a 6000 rpm max motor. I believe there is a member here that runs a 383 with the Edelbrock performer rpm heads, and I thought he running in the high 11's.

I think 200cc if perfect for what yur talking. I would have 200cc heads if I could afford them on my 383 smile.gif I guess you can always go 180cc and if they dont run hard enough you can take em off and port em out! With that much cam and gear 200cc should be nice though.

200cc is perfect, not even close to too much.

Look at the valve sizes and port cross-section that Chevy loaded onto the 396. I wouldn't get too concerned about 200 cc heads!

if its a True STREET motor, that will see mostly street time i would go for the 180's.

235 to 240 @.050"? Rock on! Ought to drive real nice. With 4.11s you'll never know they are big. Mine run fine with my 3.31s.

Originally posted by Motor Martyr:
if its a True STREET motor, that will see mostly street time i would go for the 180's. I agree.
With your hyd cam & self imposed limit of 6000 you will likely run better with the 180cc heads.
The more important number is the runner cross sectional area which unfortunately none of the head guys put in there specs.
The cc number is a good indicator of how heads of the same design will react on your engine but can be a bit misleading when comparing even a vortec style port to a standard 23 degree port or say the fast burn head to another head that isn't as efficient with approx the same port cc's

As that "famous philosopher" once said,,, still referring to cylinder heads of course :rolleyes:

"Size does matter but that ain't all there is to it" :D