s/b head casting number

[jst1960]

Im having trouble finding out about casting number 4772575.Anyone have info on these heads?Thank you.

[jst1960]

They might be 576 on the end,couldnt really tell if it was a 5 or 6.Anyone know any info on these heads?

[Locomotion]

If they are 576 heads, they are very similar to 308 heads (approx. '88-'91 360) but without the egr holes under the exhaust ports. They were only available over-the-counter and came machined for 1.88" or 2.02" intake valves. Exhausts were 1.60. Mopar also sold complete assemblies, as-cast and ported.
All discontinued several years ago.

[TK]

If they are 675's.......its a older 318 head.

[jst1960]

They are the 576's and they do have some porting.Were these a good performance head being ported?Seem to work very well for me but dont know if i should upgrade or keep these.

[Locomotion]

I have never run any ported versions, just as-cast. But from what I've seen and heard, they appear to like port work - if done correctly. They have worked well for me too. I haven't compared them directly to the older 360 heads yet but plan to in the future. Those, like 308's, are suppose to be some of the better OEM style heads.