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Re: ProMaxx Performance 440 heads [Re: young guns 90s] #2192308
11/08/16 06:40 PM
11/08/16 06:40 PM
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So. Burlington, Vt.
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fast68plymouth Offline
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I guess at this point the question is, is it a different head, or a CNC ported version of the std head?

Edit:
I just checked the link.
Looks like it's a CNC ported version of the std head.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: ProMaxx Performance 440 heads [Re: fast68plymouth] #2192352
11/08/16 08:05 PM
11/08/16 08:05 PM
Joined: Jan 2003
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Moved to N.E. Tennessee
GomangoCuda Offline
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How soon will we know how they compare to Trickflows?


In theory, there is no difference between theory and practice. In practice, there is.
Re: ProMaxx Performance 440 heads [Re: GomangoCuda] #2192471
11/08/16 10:51 PM
11/08/16 10:51 PM
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Posts: 15,439
Val-haul-ass... eventually
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BradH Offline
Taking time off to work on my car
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Val-haul-ass... eventually
Originally Posted By GomangoCuda
How soon will we know how they compare to Trickflows?

I'll take a w.a.g. and say you can use the published data for the MCH CNC-ported Stealth or Edelbrock Performer RPM for comparison.

Re: ProMaxx Performance 440 heads [Re: young guns 90s] #2193011
11/09/16 01:51 PM
11/09/16 01:51 PM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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fast68plymouth Offline
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The MCH CNC rpm/stealth porting program is more like 251cc, so if these are 11cc less.... One might "assume" they would flow a little less.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: ProMaxx Performance 440 heads [Re: fast68plymouth] #2193173
11/09/16 04:55 PM
11/09/16 04:55 PM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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BradH Offline
Taking time off to work on my car
BradH  Offline
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That's why I said w.a.g. instead of s.w.a.g. grin

Re: ProMaxx Performance 440 heads [Re: young guns 90s] #2193339
11/09/16 06:57 PM
11/09/16 06:57 PM
Joined: Mar 2010
Posts: 1,308
Spencer NY
killermopar Offline
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Spencer NY
Would the CNC version make sense on a low deck, Street, 512 build?

Re: ProMaxx Performance 440 heads [Re: young guns 90s] #2197929
11/17/16 01:16 PM
11/17/16 01:16 PM
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central texas
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krautrock Offline
top fuel
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central texas
I would think these heads would work nicely for stroker street motor.

I'm going to (eventually) build a 451 low deck since I picked up a 440 crank that has already been machined for the application. Tempted to run the trick flow heads because of the combustion chamber but honestly, I would probably be happy (aka, make plenty of power) with the unported Promaxx heads too.

anyways...

got an email back from Promaxx. I asked about their hydraulic spring application...


Lift intake exhaust
.200 157 108
.300 224 152
.400 275 184
.500 305 208
.600 318 227
.700 323 239
.800 327 247

The specs of the head stays the same, so the combustion chamber would stay at 84cc's. The manufacturer of the springs for this application is Pioneer.

Re: ProMaxx Performance 440 heads [Re: young guns 90s] #2197935
11/17/16 01:29 PM
11/17/16 01:29 PM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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fast68plymouth Offline
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If they flowed that on my bench they would be better than the TF heads.

I for one don't think that would be the case........ But "ya never know".


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: ProMaxx Performance 440 heads [Re: young guns 90s] #2414195
12/06/17 02:23 PM
12/06/17 02:23 PM
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Posts: 2,094
central texas
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krautrock Offline
top fuel
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central texas
i just found these pics of the promaxx CNC ported heads. the price for these heads bare is pretty high, jegs has them complete for 1700 i think. I would wonder if all the CNC heads have the chamber done like on this listing.
at 90cc in the chamber that might be a good option for someone trying to keep compression down some.

there are small block heads listed too.


promaxx BB


promaxx SB

Last edited by krautrock; 12/06/17 02:25 PM.
Re: ProMaxx Performance 440 heads [Re: young guns 90s] #2414211
12/06/17 02:44 PM
12/06/17 02:44 PM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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fast68plymouth Offline
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The assembled heads are more money than the TF 240's...... And they're Chinese castings.

IMO, TF pretty much has that market covered as long as they keep the prices similar to what they are now.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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