Pro Series... All of our designed cast aluminum cylinder heads are hipped (hot isostatic pressing) This process forces trapped gasses, voids, porosity to the surface making the complete head to be more dense, and up to 20% stronger

SONNY'S NEW 5.000" BORE SPACE SYMMETRICAL PORT BILLET ALUM. HEAD WITH WATER JACKETS, COMPLETE RACE READY WITH COMPONENTS

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Sonny's 11 Degree 5.000" Bore Space Symmetrical Head, Complete Race Ready, with all components

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SONNY'S SYMMETRICAL PORT 5" BORE SPACING 5 x 13 "PRO SERIES" HEADS, COMPLETE RACE READY WITH COMPONENTS, FULLY ASSEMBLED

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SONNY'S SYMMETRICAL PORT 5" BORE SPACING 5 x 16 "PRO SERIES" HEADS, COMPLETE RACE READY WITH COMPONENTS, FULLY ASSEMBLED

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SONNY'S SYMMETRICAL PORT 5" BORE SPACING "PRO SERIES" HEADS (DRAG), COMPLETE RACE READY WITH COMPONENTS, FULLY ASSEMBLED

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SONNY'S SYMMETRICAL PORT 5" BORE SPACING HIGH PERFORMANCE STREET

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SONNY'S SYMMETRICAL PORT 5" BORE SPACING HEADS (MARINE)

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