Howard Jones
Supporter
Interesting numbers:
302 CI / 366HP = 1.21HP per CI
331 CI / 415HP = 1.25 HP per CI
347 CI / 450HP = 1.29 HP per CI
IMHO 1.3 HP per CI is just about the practical limit for pump gas. I bet every one of these motors are between 10.0 to 1 CR and 11.0 to 1 CR. Again a practical limit of pump gas. The Ford 302 crate motor is 9.5 to 1 CR and makes 345HP. My motor (Ford crate 302) with cleaned up valve pockets 302 X aluminum heads and a B303 cam was rebuilt with 10 to 1 pistons and well balanced made right at 307HP at the wheels.
289 at 1.3 = 375.7 HP
289 at 1.25 = 361 HP
Both 289 combos above would require near the 11 to 1 end of the range, big valve ported heads, and a fairly big cam.
I agree with Jac……………...again! Rebuild your 302 with quality hardware, balance it near perfect, and tune it well.
302 CI / 366HP = 1.21HP per CI
331 CI / 415HP = 1.25 HP per CI
347 CI / 450HP = 1.29 HP per CI
IMHO 1.3 HP per CI is just about the practical limit for pump gas. I bet every one of these motors are between 10.0 to 1 CR and 11.0 to 1 CR. Again a practical limit of pump gas. The Ford 302 crate motor is 9.5 to 1 CR and makes 345HP. My motor (Ford crate 302) with cleaned up valve pockets 302 X aluminum heads and a B303 cam was rebuilt with 10 to 1 pistons and well balanced made right at 307HP at the wheels.
289 at 1.3 = 375.7 HP
289 at 1.25 = 361 HP
Both 289 combos above would require near the 11 to 1 end of the range, big valve ported heads, and a fairly big cam.
I agree with Jac……………...again! Rebuild your 302 with quality hardware, balance it near perfect, and tune it well.