are the cyl heads ofa 289 2 bbl and a 289 4 bbl the same? if i install a 4bbl intake and carb on a 2 bbl engine, will it perform like a factory 4 bbl?

 

The porting was the same but I think the 4-barrel had a smaller combustion chamber. Performance will depend on how well you tune it.

 

Yeah, the A code heads have a slightly smaller combustion chamber. Putting a 4 barrel carb on a C code engine won't give you much benefit.

 

 

Bull-puckey. There is no difference between two barrel and four barrel heads on a 289 CID engine. Compression ratios were determined by piston height, combustion chambers were the same, valves were the same, the heads were identical. Now, there were different combustion chambers for different years, but those heads were used interchangably for that years models.
Jim

 

if one was to be looking to buy some after market heads, how many CCs should they look for for a mild-moderately modded 289? (moderate cam, intake, carb, gears/posi?) i was lookin at some AFR heads and im not sure which CC to look for[:@] 165, 185, 205?

 

165's, but canfield 170's or the smaller RHS heads would be better IMO.

 

165 will be all you need in a 289. 185's would be better off in a similarly built 331 - 347, and 205's way too much for the little motor (can you say "lazy flow"?).


Norm
(who has AFR 190's in a mild/moderate 350 SBC, BTW)

 

link me up baby!

 

http://www.canfieldheads.com/sbf_standard_intake.htm (170cc runners)

<~~~ owned by comp cams btw (180cc runners)
http://www.compperformancegroupstore...egory_Code=SBF

and of course there is always the gt40p's from tristatecylinderhead for 600 bucks a pair which would flow excellent for your motor without being too big.