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Promaxx 320 flow numbers

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Promaxx 320 flow numbers

Old 01-13-2017, 05:21 PM
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Originally Posted by phragle View Post
Though my main thought that has me looking to alum heads is the better cooling and ability to handle more compression..
Better cooling how?
They don`t handle more compression, they require more compression due to the faster absorbtion of heat.
Only advantage to Aluminum heads is weight saving, the rest is just marketing and old wives tales that came from great marketing.
You buy ready to bold on assembled heads all the specs are going to be tight for automotive use.May work just fine with tight valve guides and factory valve jobs, or it may not. Tim might be able to shed some light on that.
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Old 01-13-2017, 05:36 PM
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Originally Posted by ICDEDPPL View Post
Better cooling how?
They don`t handle more compression, they require more compression due to the faster absorbtion of heat.
Only advantage to Aluminum heads is weight saving, the rest is just marketing and old wives tales that came from great marketing.
You buy ready to bold on assembled heads all the specs are going to be tight for automotive use.May work just fine with tight valve guides and factory valve jobs, or it may not. Tim might be able to shed some light on that.
Not from promaxx assembled, but from a marine engine guy assembled......
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Old 01-13-2017, 06:05 PM
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Here's a little more info on the subject cast vs aluminum.

http://www.performanceracing.com/mag..._aluminum.html
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Old 01-13-2017, 08:50 PM
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Here you go getrdunn. I talked to Jim a bit but he wasn't at the shop. I needed to get some oil for the Caddy and they were on the flow bench.
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Last edited by Rookie; 01-13-2017 at 08:54 PM.
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Old 01-13-2017, 08:54 PM
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Originally Posted by Rookie View Post
Here you go getrdunn. I talked to Jim a bit but he wasn't at the shop. I needed to get some oil for the Caddy and they were on the flow bench.
Cool Tks. I'm getting pumped.
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Old 01-13-2017, 08:55 PM
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I'm no expert, but they are very clean castings. Just as Jason said when we spoke with them. Their first order of business when they purchased them was to up the quality.
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Last edited by Rookie; 01-13-2017 at 08:57 PM.
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Old 01-13-2017, 09:05 PM
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Those do look like some nice castings.
The pockets look nice around the guides.
Be cool to see the chambers with the head gasket laying on the surface. Looks like the intake valve is ushrouded quite a bit from the get go.
Please take some similar shots after he's done.
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Old 01-13-2017, 09:07 PM
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What problem was Patriot having ?
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Old 01-13-2017, 09:14 PM
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Originally Posted by SB View Post
What problem was Patriot having ?
If I recall it was the aluminum alloy and the machine work after casting. ProMaxx has them (supplier) machine the heads "steel safe" and they (Promaxx) machines them to the customers given tolerances. They do all final machining passes.
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Old 01-13-2017, 09:21 PM
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Originally Posted by SB View Post
What problem was Patriot having ?
To my knowledge it was cash flow and finish quality. From what I understsnd since they've been at new foundry and under new ownership things have improved a great deal.
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