PROMAXX Performance Products specializes in all types of automotive cylinder head for any budget, carrying Performance cylinder heads, diesel cylinder heads and stock replacement …

MAXX Series The MAXX Series is taking the affordable performance cylinder head to the next level. There is no comparison in the market. Our new ultra smooth casting made of Grade A …

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 …

There is NO AS CAST head on the market that can outflow these heads PERIOD! We have done our homework and produced what we believe is the best as cast head-on at an affordable price.

We are a family owned business that began in 2012 by purchasing the remnants of Patriot Performance and Alabama Cylinder Head Exchange. We specialize in all types of cylinder …

Ultra-smooth 356-T6 Aluminum casting Precision CNC machining 5 angle valve job Hand Bowl Blended Unshrouded chamber Diamond honed Bronze guides Large spring pockets Multiple …

At PROMAXX, we provide our XXTREME series at prices that make our competition cringe. Going fast doesn’t have to break the bank, so get a pair of XXTREME Series Heads today.

Spring Options Add to cart Part Number: N/A Category: MAXX SERIES Features Flow Chart Cylinder Head Options Technical Specs Additional information

Upgrade Rocker Arm Studs to a 7/16″ This option is NOT available w/ bare heads Yes (+$20.00) Add to cart Part Number: N/A Categories: MAXX SERIES, SBC

The 185cc series 1 heads are perfect for that budget build. Making great power at a price that cannot be matched. Machined and assembled in the USA. Dyno results show 20 to 35 hp …