Quote:
Originally Posted by bigblockv6
That's odd because a 77 GMC would have come with an HEI as standard equipment  |
Yes, HEI was used as early as '72/'73 model year on some engines, Chevy used it a lot in '74, and on everything in '75.
I had a '70 Nova with 307 V-8, and a '77 Firebird with 301 V-8, HEI was a much better system.
Installing an MSD 6AL sounds like a great idea. They make speed limiter chips low enough to match the Big V-6's operating range, 3000-3800, and 4000-4800. Take your pick.