Str8jacket Head - Large Bore (4.125"+) | Single Head – Mast Motorsports
Cast | Machined | Built in the USA

Str8jacket Head - Large Bore (4.125"+) | Single Head

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  • $ 1,499.99

The Str8jacket head is an all out race head designed to be a cost-effective alternative to the pricier race heads available today.  Don't let the cost effective nature of Str8jacket fool you.  It is still cast & machined in the USA!  Str8jacket will come in two models, a Medium Bore for 4.000"+ bore sizes and a Large Bore for 4.125"+ bore sizes both featuring an inline valve layout.  Check out the ridiculous specs below!

Str8jacket - Large Bore
• 2.250" Intake / 1.600" Exhaust Valves
• 11 Degree Valve Angles
• 47 CC Combustion Chamber Standard
• Copper Intake Seats
• Ductile Iron Exhaust Seats
• Bronze Valve Guides

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