11secdart and rmchrgr, thanks for the replies! I am really liking the times you guys are all running with the W2's. This is an E body so little heavier but if I can get anywhere near the times you all are running I'd be more than happy. If I did it, i'm thinking maybe I'd keep the 4.56's and see how they work out.

J body, yes they are the Econo W2's David Dean is selling. I am really leaning towards getting them if I can make it all work.

I am pretty sure this motor has H beam rods based on the price listed on the build sheet. I also only found one set of Speed Pro pistons for a 4.070 bore small block chrysler, so those are probably the ones I have. Using those specs I found a few website stating that a 65cc head would give me a 10.1 C/R (although all the compression ratio calculators I used assuming a .018 piston to to deck and .025 head gasket gave me around 9.7).


If I can really get 10:1 without milling anything, I think I'll be on the right track. In the future I don't mind milling or even installing higher compression zero deck or pop up pistons, but for now I wouldn't have the money to be doing that.

Realistically, how much power could these heads make on a 10.1 340 using the Indy intake and biggest cam that will work with my compression? It would be a dream to get this car into the mid-low 11's all motor, think that would be possible with the 4.56's and upping the stall? I am worried that A) I won't have enough compression without milling the heads and B) those heavy speed pro pistons are going to hurt the bottom end. What do you guys think?


Here are the flow specs

Intake

Lift
.300- 196 cfm
.400- 249
.450- 266
.500- 274
.550- 294
.600- 291


exhaust

.300- 154cfm
.400- 182
.450- 188
.500- 192
.550- 193
.600- 190