I attained some Edelbrock Performer RPM heads. Casting number on end of head (assuming part #) is 6089. This number is no longer listed (current is 60899), I was just wandering if anyone could confirm that these are/aren't 64cc heads. Also, any suggestions on cam selection for these heads, currently motor (355) has 305 heads and 10:1 compression, Comp Extreme Energy 273 cam, Edelbrock performer eps intake, Holley 650 carb, hedman headers, also 2200 stall converter and 3.73 gears out back. Also recommendations for head gasket selection for these heads to keep compression up. BTW, car is just a toy now, and is no longer a daily driver, also I'm looking to put up some good numbers on a dyno that we are going to have here at college in the spring......so I guess that I can sacrifice some low-end power. Sorry this was so long, and thanks for all your input.

I believe 6089 is the casting number, then they're sold bare as 60889, assembled as 60899, or assembled and polished as 608919. They're 64cc chambers, 170cc intake ports.

If the heads are used, I might recommend having the chambers measured incase the previous owner had them machined, re-decked, etc.

thanks for all the info, any suggestions on cam sizing?

Roller or flat cam?

flat-tappet

Those heads are designed for a street build; not an all-out power kind of racing setup. In fact they will often give better results in a street situation than the high-flow race units.

I'd stick with a sensible STREET grind. Something in the 225-230 degrees @ .050" range, max; and with about 10 degrees more .050" exhaust than intake. A Comp XE268 or XE274 would be about perfect. Lunati and Crane and Crower have somewhat similar grinds that would also work well.

They are not good heads to build a dyno queen out of. As I said, that's not what they're for. They're meant for a nice stout daily-driver or street-rod type of motor, not a racer... or for putting up big numbers on a dyno.

I'd stick with the regular Fel-Pro performance gasket; 1004, or 1010. Have them decked to 58-60cc or so rather than dinking with head gaskets.

that works out pretty good since I have the XE274 cam in the motor now. One thing that I was wondering about is why in the world is the cam edelbrock recommends for this with there package deal have such high advertised durations (300) when at .05" range there close the the XE 274 cam. Also, what should I expect with power with this setup, around 375HP max?

Also, sofakingdom, thanks for the well explained response.

The Edelbrock cams have long lazy ramps that give them large advertised durations compared to the .050 duration.