Str8jacket Head - Medium Bore (4.000"+)

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  • $ 1,399.99


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 - Medium Bore 
• 2.250" Intake / 1.570" Exhaust Valves
• 11 Degree Valve Angles
• 47 CC Combustion Chamber Standard
• Bronze Valve Guides
• Ductile Iron Valve Seats 

Str8jacket Medium Bore Race (4.000"+)
Flow Data w/4.065" Bore Plate
Valves 2.250 / 1.570
Lift Intake Exhaust
0.050 39.8 28.6
0.100 76.4 54.1
0.200 142.4 106.2
0.300 217.2 152.1
0.400 279.4 201.9
0.450 305.1 220.4
0.500 324.2 231.3
0.550 344 237.9
0.600 359.1 243.3
0.650 372.5 247.9
0.700 381.9 251.5
0.750 391.9 253.9
0.800 392.8 255.3
0.850 399.8 256
0.900 404.6 257.8
0.950 405.3 258.2
1.000 408.2 259.7