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Old 01-13-2013, 08:04 AM
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283 rebuilt with a true 10:1cr using the 461 heads Get the compression ratio right. (can be ported for more effect)
EG:
hyd roller cam 208 to 218@.050" (The GM ZZ4 crate motor cam would be a good choice)
208-221@.050" .474-.510" 112LSA. ( can use a 1.6 intake rocker to effect if the heads are ported)
will need some retro fit valvetrain parts like the lifters, valve springs springs etc.

Performer RPM intake- headers dual exhaust 650-750cfm carb
recurved distributor.
Replace the power glide 2speed transmission with a th350 3 speed auto and get a 10" "3500 stall" converter.
No, this is not too much.
The real stall speed will be about 2800-2900 rpm, behind a 283.
Replace the axle ratio with a 3.73-4.10 ratio and a eatons replacement posi.

You will have a very good running Impala, using the 283.
if you don't want osue a hyd roller then keep the hyd flat tappet cam in the same .050" duration group.
The lil 283 will want to rev. Don;t wimp out on the trans swap and critical converter and rear gear selection.
Getting these factors as will as the engine compression ratio correct is critical.
The 461 heads need some work to wake them up. Stay with a 1.94" intake valve thou.

Last edited by F-BIRD'88; 01-13-2013 at 08:09 AM.
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