1.) The horse power to cubic inch ratio must be at least .775
2.) I only post one of each engine for each make.  For instance I won't put a 1971 Chevy 454 on here because I already have a 1970 454.

Year = year(s) of engine
Make = manufacturer of engine
Size = actual cubic inches of engine
bhp = base horse power
torque = ft-lbs. of torque
bhp/c.i. = base horse power per cubic inch of engine
List leaders in bold.
 

Year	Make	Size	bhp	torque	bhp/c.i.
1961 1965 1969 1970 1970	Chevrolet	409 396 Z16 427 ZL1 350 454 LS6	360 375 430 360 450	409 420 450 380 500	.880 .947 1.007 1.028 .991
1965-66 1969 1970	Buick	401 400 455 Stage 1	325 345 360	445 440 510	.810 .863 .791
1964 1966-67 1968	Oldsmobile	330 400 455	310 350 390	355 440 500	.939 .875 .857
1965 1969 1970	Pontiac	389 400 455	348 370 360	424 455 500	.895 .925 .791
1962 1963 1968 1969 1971	Ford	406 427 C.J. 428 Boss 429 Boss 351	405 425 335 375 330	448 480 440 450 370	.998 .995 .783 .874 .940
1962 1963 1966-71 1969-70	Mopar	Max Wedge 413 Max Wedge 426 426 Hemi 440 (six-pack)	420 425 425 390	470 470 490 490	1.017 .998 .998 .886

Shift into reverse!