Well, we obviously missed the 10:1 compression ratio on the 434 and I'm running 104 octane now. One of the reasons I stayed with the Motown 220 Lites was because they required little work other than to put the 3-angle job on them that should have been there in the first place. These heads are pretty crappy no matter what, but came with the engine so we decided to try to use them.

Money's not the issue, but I not building a nitro monster either. I'm thinking Brodix or Dart - maybe something flowed in the 235 range. I just want a really good set of heads that I can use for hyd roller or mechanical roller (rebuild required - I know) and get more than 100 hours of operation from. I might even go with iron heads, but like the thermal characteristics of aluminum. I don't have to have angle plugs, but I think the highest flowing heads will have ap's. Final compression can be upwards of 11.5:1 since we blew the pump gas target anyway. I'm not totally bummed about that since the car really stands up when it gets the go-juice it wants....

Thanks,

Hi Mike,
Either AFR 210 with the competition porting or the Brodix M2-215 Track ones are excellent right out of the box.
If you had a solid with more RPM I'd go to the 227 but think it's a bit large for your RPM
The new Brodix RaceRite is also outstanding but at 200cc you probably want a little more port.
Don't really think you need a 235cc port for 6000-6500.

email me & I can probably save you a dollar or two on either ;)

Thanks, Mike. I was just shooting for max "headroom" for the future - that's the only reason for the 235. I'll send you email. I hadn't thought about AFR's....whatever flows best is good with me.

How about port matching a new manifold? I'm sure I've got overlap on one side or the other - should probably get that all nice and clean while I'm at it. We can cogitate on all that via email.

Best,

Well if your 434 had 64cc heads and 11.5:1 compression consider going with an AFR 227 competition pkg head with 76cc chambers. Then you will be back in pump gas range and have a nice flowing set of heads to boot.

Mike, if you're at all serious about using a solid roller you will be hard pressed to do better than the M2-227 or AFR-227 (100%cnc package). From what I understand, the Motown head is actually a Canfield head and can be made pretty good with some porting. What is it about the head that you don't like?