AFR Heads
RPM
Most bracket style engines will see 7500 RPM or less.
Most max effort engines will see 8000 RPM or more.
Piston Speed
Most bracket style engines operate in the 5000 fpm
Most max effort engines operate in the 6000 fpm.
To allow max effort engines to live at those levels, the use of titanium valves, light weight billet crankshafts and assemblies, custom valve trains are required, (60MM cams
) ect.
I would also say if the build uses off the shelf pistons and standard rings, roller rockers and non custom manifolds, it's no way close to a max effort engine.
Calvin Hill
Hill Performance
708-250-7420
RPM
Most bracket style engines will see 7500 RPM or less.
Most max effort engines will see 8000 RPM or more.
Piston Speed
Most bracket style engines operate in the 5000 fpm
Most max effort engines operate in the 6000 fpm.
To allow max effort engines to live at those levels, the use of titanium valves, light weight billet crankshafts and assemblies, custom valve trains are required, (60MM cams
) ect.I would also say if the build uses off the shelf pistons and standard rings, roller rockers and non custom manifolds, it's no way close to a max effort engine.
Calvin Hill
Hill Performance
708-250-7420