460 514 heads, part #s

MAXVELO · #1 (**permalink**) 06-15-2005, 02:48 PM

Why does Summit and jegs show 2 different part #s for 460 and 514's I thought they were the same head. I found a set that is ported and polished and I want to know what prevents one head part # from working on the other short block. The 460 head part # is 397-M-6049-SCJA and the 514 head part# is 397-m-6049-SCJB. Whats the diff??

HighPlainsDrifter · #2 (**permalink**) 06-15-2005, 02:57 PM

Max,
The A heads are for flat tappet cams and The B heads are for solid roller cams with lots more spring pressure,don't use them on a flat tappet cam.
Perry.

scootter · #3 (**permalink**) 06-15-2005, 03:05 PM

I just changed my heads to the lighter springs. !3.5k on engine, bad lifters, cam, cam bearings, replaced all valve springs @ 9k, more broke at 13k.

MAXVELO · #4 (**permalink**) 06-15-2005, 03:17 PM

Good info, makes sense to me!