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 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 performance has designed a complete new line of performance heads that meet or exceed the big names in the industry.
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