But as far as flow goes, they are pretty much the same?
Thank you, the heads are already assembled and I ran them for half a season last year. I was just surprised when the gentleman that's inspecting the engine for me told me they were the econo heads. It could just be a case of I misunderstood what the previous owner of my Dart told me.
Seemed to run fine. Strong small block. However I was about 3 tenths slower than what the previous owner had told me the car should run ( high 10.60s - low 10.70s instead being in the 10.30 range) which got us scratching our heads. We quickly agreed that the converter in the car was too tight. And we also determined (and agreed with by the engine builder) that it was down about 100HP below what it should be making. Seems like a lot to me, but I'm new to racing small blocks so I'm still learning them. After experimenting with carb jetting and valve adjustments at NED in October I got it to run a best of 10.49 at 124. So out came the engine, trans and converter and were taken down to a shop in Connecticut. The previous owner is getting the converter reworked for me. His transmission guy is installing a trans brake in the 727 and also going through the engine, as he developed this particular small package that he ran 9 second 1/4 times in a 68 Cuda and an early 80s Charger. So far the only news from his inspection of the engine is he found too much lateral movement in some of the rocker arms and he's already addressed that issue.
The list is long and would require someone having a lot of old books to search the numbers. Just to add to the mix, you could get the head loaded as well. All the ports are the same within the casting number series. IE; All first run heads are the same. Then the second run of updated ports are the same, and so on.
