Big block "915" heads performance

[71gtdart]

I think most guys know what these are. They are to my knowledge the only factory big block heads that came with a closed chamber design. only available in the 1967 model year.

If that info is wrong feel free to correct me.

Anyway, I've ended up with a nice set that has had some decent port work done to them, and has 2.14/1.81 valves in them.

I've never run a set of these on anything. I was wondering what experience some of you guys may have had with them in a performance application? I would suppose one benefit of using them would be higher compression due to the closed chamber, but other than that don't know a lot about them.

What would be some of the pros and cons to using these vs say a set of the "906" heads?


I will be using them on my 67 Belvedere in a street/strip application. would love to have something that would cruise around town and still run 7.20's to 7.50's at the track.

engine combo is a .60 over 440 with factory forged crank and rods. most likely a solid flat tappet cam, but may go with a solid roller. have a port matched RPM Performer intake that I will be using as well.

Thanks for any input.

 

[451Cuda]

Very small difference between all the factory iron BB heads. 915 will give a little better quench and small bump in compression. In some cases 915 with big valves can have shrouding but in a .060 440 you'll be fine. Bolt em on and go.