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Promaxx performance products specializes in all types of automotive cylinder head for any budget, carrying performance cylinder heads, diesel cylinder heads and stock replacement cylinder heads Internally balanced and machined to factory specifications, this crank i. Promaxx performance has designed a complete new line of performance heads that meet or exceed the big names in the industry.

Shop exhaust systems, fuel tanks, air intakes, and more at prosource diesel! This combined with our 5 angle competition valve job, diamond honed bronze guides, hand bowl blending and assembly by our professional builders right here in the u.s.a produces out of box performance that out performs the top brands in the industry Promaxx designed their own cnc programs to port chambers, bowls, and runners to maximize air and fuel flow

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Compare what they say about each head and then say what the difference in the heads are

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