I had a friend recommend using a set of Speedmaster or Pro Maxx heads on a small stroker pump gas 360 L.A. motor I'm going to build later this year.
Anyone on here use them, either brand? If so what did you think of them and how did they work? All comments welcomed, good or bad
I'm thinking of buying a set of their fully CNC complete heads
Thanks in advance

The Promaxx have better finish work than the Speedmaster.

see this thread for good pics of the valve job. I also remember MonteSmith saying that he knew that the peeps at Promaxx have nice equipment and they know how to use it...
https://board.moparts.org/ubbthread...ll-block-mopar-promaxx-head-testing.html

I think Fast68 flowed some ootb speedmaster heads on his bench, maybe he will post those up for you.

Buy the Cnc version bare...and buy your favorite valves and springs....take them your favorite machine shop and have the valve job done.

I have two set in use....one set ported by hand by IMM in Indio Ca......that 71 360 Dart has run 10.50s in Vegas air....
Second set on 75 duster ....bought them bare ....and did as i said above...car runs great for the throw together motor that is in..
just had another set ported by someone who a specialist doing Nhra stock/super stocker heads and engine ...these were the 1st set he had seen and gave them great reviews...
and the flow data is pretty much the same as the ones done by IMM...

I would bet that they are cast at the same foundry in china.....dont see multi foundries casting mopar aluminum heads....



https://www.forabodiesonly.com/mopar/threads/speedmaster-head-thread-index.451807/

sticky thread on all the speed master heads post....

I have a used set of the ProMaxx 171 non-CNC heads. I bought them from a member here that went to TF on his next build. I was told they are OTB with ~1000 miles and some passes on them. I think they look great. Nice finish work in the bowls, good looking valve job, and a real nice casting overall. Everyone I've shown them to say the same. I'm looking forward to putting them to use. I contacted ProMaxx and if I want to I can send them to be CNC'd to the Shocker 185 version for about the difference in the list price between the two. The gentleman on the phone was very helpful. From the pics I've seen, the ProMaxx is a step above the Speedmaster, both regular and CNC. Doesn't mean the Speedmaster won't run, but from the discussions on FABO, the SM wants some work in the valve job and the PM is ready to go OTB.

It would seem to me the CNC ported SBM ProMaxx Head would be a tough sell.

Both equipped with HR spring packages...... the TF head is actually a little cheaper than the PM Shocker 185.

I'd agree with that, absolutely. If I was starting from zero, I'd give the TF a go. The ProMaxx did go on sale a while ago for a time, and it would make that decision harder if you were on a tight budget.

In my case, I could get my 171's upgraded to the Shocker level and the total would still be quite a bit under the retail of the 185's. I'm still a long way from that happening though.