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Old 02-04-2025 | 08:58 AM
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Originally Posted by TeamSaris
Bang for the buck they are some of the best heads out there. Jason and his team at promaxx (in alabama) are also great people. They also do awesome repairs on all makes of head. I have race teams with more than one championship on promaxx heads. If you arent buying dart, brodix, or profiler, buy promaxx and be happy.
I noticed AFR missing from that list?
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Old 02-04-2025 | 10:54 AM
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Originally Posted by Wildman_grafix
I noticed AFR missing from that list?
I do know that Saris is using AFR heads on my 540 build.

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Old 02-04-2025 | 11:27 AM
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Originally Posted by Wildman_grafix
I noticed AFR missing from that list?
Not on purpose. I have AFRs on the engine in my boat, and our race boat. They're an awesome product.
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Old 02-04-2025 | 12:34 PM
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Originally Posted by TeamSaris
Not on purpose. I have AFRs on the engine in my boat, and our race boat. They're an awesome product.
Ok Thanks, was wondering.
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Old 02-10-2025 | 02:14 PM
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Originally Posted by Tartilla
Not bad considering they're $1500+ bare.

The 317s flow really well and have a stable port. The 290s aren't as good in that regard. Despite being a bit smaller. A well matched cam and intake will minimize the issue.
flotek/promax 290cc good port is turbulent out of the box, reshaping the head bolt pump inside the port fixed the problem in flotek 290cc heads.
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Old 02-10-2025 | 07:19 PM
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Originally Posted by JaniH
flotek/promax 290cc good port is turbulent out of the box, reshaping the head bolt pump inside the port fixed the problem in flotek 290cc heads.
Please don't confuse flotek and Promaxx heads.
2 different heads...
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Old 02-11-2025 | 05:49 AM
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Originally Posted by SkiDoc
Post some photos Jim!
Here you go, build thread below. These made 766HP/760TQ at 4.2 PSI Boost.

The Snowball of "Unregistered Gun"

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Old 02-11-2025 | 07:53 AM
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Originally Posted by Rookie
Please don't confuse flotek and Promaxx heads.
2 different heads...
To different brands, same head. Both are Steven sun castings from china.
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Old 02-11-2025 | 09:11 AM
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Jim beautiful!
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Old 02-15-2025 | 06:48 PM
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Default Have had great results

I had great results with my 317’s built to marine specs!

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