Vintage Top Fuel Hemi Heads

[Huskinhano]

It's fascinating as hell looking at the pictures. The porting work looks well done, meaning blended nicely. I wonder how much better compared to a stock or even a 354 head.

[BOSSMAN]

My guess is around 270-280cfm on the intake and around 250 on the exhaust for peak numbers. The intake port is choked up pretty good and the exhaust side is huge. I have a port design that does 410+ cfm on a factory stock casting (not a 392 casting like this one). I lost two flowbench motors this week so I'm waiting for the replacements to show up to flow test this head.

[DanStokes]

Nick - Do you have a SuperFlow bench? We had one at work and I was sometimes able to use it after hours. I really didn't have anything that needed a bunch of flowbench work at that time but it was WAY cool to be able to measure what I had.

Dan

[BOSSMAN]

Nick - Do you have a SuperFlow bench? We had one at work and I was sometimes able to use it after hours. I really didn't have anything that needed a bunch of flowbench work at that time but it was WAY cool to be able to measure what I had.

Dan

I have a Saenz S-600 which is very similar to the Superflow. Mine just has one extra motor. I'm looking into building a custom one with more capacity.

[BOSSMAN]

Sorry it took me awhile to get at flowing this head, my shop has been full of work lately!
Anyways, in case you ever wondered what a Top Fuel Early Hemi head flowed from back in 1669-70 here is what it looked like!

[Huskinhano]

Pretty much what you thought. I guess you've done this once or twice before

[Beagle]

almost makes me wonder if there's anything left in the exhaust port... flip the lobes, put a bunch of webers on the exhaust ports, run the new exhaust out the old intake!

[BOSSMAN]

Nope, keep in mind this was done before flow benches. The work (especially in the seat area) would be considered crude by today's standards but I understand what was trying to be done. For comparison I have a CNC program for a Factory Iron 331 head that does 400+ cfm on the intake using a 2.200 valve and my flow curve is very similar on the exhaust side with a .150 smaller valve. Much more efficient!

[DanStokes]

We humans keep learning! Amazing what's been found out in the last couple of decades.

Dan

[Barry Donovan]

almost makes me wonder if there's anything left in the exhaust port... flip the lobes, put a bunch of webers on the exhaust ports, run the new exhaust out the old intake!

that is for subarus.