'57 Chevy Rochester Fuel Injection

[Bob Mulry]

Originally Posted by Jim Johnston/6022

I think Bill Parmenter tried the fuel injection in his 57 super stock years ago without much success. I believe the only difference from 250 hp to 283 hp is camshaft. His nephew Mike is on here sometimes he might know how it ran. My experience is back in the 60"s trying to get one to run properly and i remember high vacuum was needed to make one run decent. With our weird camshafts that would be a challenge.

283/250HP = flat top piston = 9.5 to 1 +/- = .398/.298 lift hydraulic lifter

283/283HP = .122 dome = 10.5 to 1 +/- = .394/.400 lift solid lifter

[Mark Yacavone]

We had a 283 / 250 in a 59 'vert, back in 71. Fell at 15.01 in O/SA
Already superceded } the aluminum Powerglide, the 62 327 smooth top FI unit, ..520 heads.
Very fast car in that year, for a couple of young guys that didn't know much.
Smoothest leaving car I ever drove, until the EFI stuff.
1972, NHRA kicked it into Super/ Stock, and ruined it. Nobody could even tell us what part was the actual manifold, and how it could be modified.
Marvin 2 Speed had an orange 57 wagon with that setup, in 72-73 . Ran pretty fair at the Winternationals. He wasn't real pleased about the situation either, as I recall.

I think it was a little stronger than the 245 combo. But , today, @ 250 hp, out of a 283, I think I'd look at more modern stuff instead.