Quote Originally Posted by stylingZ
Eric, I have a virgin 1970 454 LS6 shortblock which has never been fired. It was built 25 years ago & I stored it. I am not sure what heads were used other than they were open chambered to lower the LS6 high compression pistons. I will be running this in a 30 Model A roadster, with a turbo 400 (billet clutch hub, Red Altos, Kolene steels, & shift kit), the gears are 3.89 in a 9" 31 spline Ford rearend), the converter is supposed to be somewhere from 2400 to 2800 rpm. The cam is a hyd roller 231/239 dur @ .050 with 626 lift across the board. I am just shopping for the RIGHT heads IF the ones I have are NOT the correct one. My current heads are ported, 1.7 Crane rollers, Jomar stud girdle, and are supposed to have 2.19 intakes with 1.88 exhaust valves which is what I paid for long ago however I will not know for sure if I even have them until the heads are removed. I am hoping I at least have the 781 heads. If I have these heads will they work okay or should I go a different route? The roadster is just a sunny day toy and not built for drag strip racing events and will not likely hook up.
If money where not an object my first choice for an oval port head would be the Brodix
RR-BB-O heads with the CNC'D combustion chambers.
If you look at the mid-lift numbers .300-.400 lift area where you valve spends most of the time these heads are very good.
The 781's will work but they will require a lot of prep work to make them work for what you are doing.
If I had to guess I would say the Brodix heads will make an easy 35-50 hp over the 781's.