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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. Independent flow bench testing shows over 400 cfm with. 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.

Promaxx performance continues to evolve with the project x lineup and has raised the bar on the competition An as cast head that is just as efficient as competition’s cnc ported pieces There is no as cast head on the market that can outflow these heads period!

Unlike most of our competitors, we don’t offer different quality cnc designs

At promaxx, we provide our elite series at prices that make our competition cringe Going fast doesn’t have to. About promaxx performance we are a family owned business that began in 2012 by purchasing the remnants of patriot performance and alabama cylinder head exchange The shocker cnc 340cc bbc is a professional designed cylinder head using the latest cnc porting tools

These heads out flow the competition at a price that cannot be touched The sbf maxx 180 is an as cast head that beats the competition Don’t let the size fool you, flowing over 260 cfm, this head makes real power It puts out up to 20 hp over the competition.

Our products are not manufactured, endorsed or sponsored by ford, gm, cummins, chrysler, jeep, mazda, toyota, isuzu or volkswagen

Our use of the terms “ford” “gm” cummins “chrysler”. This head is for large bore power w/ a 63cc combustion chamber Dyno results produce 700 hp plus on pump. The maxx 290 is truly a rare breed in today’s market

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