I've got the Melling SPC-7 cam in a 400 with 6X-4 heads on it. Has been running great for the last 5 years since I built it. Originally had it in a '75 Trans Am with 2.56 rear gears and it did great on the freeways, got upwards of 19.5MPG driving 600 miles from San Francisco to San Diego. It's now in a '69 Lemans with 3.55 rear gears and a 3 speed manual. Pulls very well up to 4000RPM (where I draw the line) and idles like it is stock. Planning to potentially bump up the compression over the winter to give it a little something extra.
I don't track race so no time slips or anything and it could definitely use a little bit more adjustment in the carb department (has a stock 1977 400 quadrajet on it with some minor tweaking) to really dial it in, but so far it hasn't really needed it or felt like it was missing anything. It definitely feels faster than the Summit 2801 in a 400 I had with 4X heads and a 3.23 rear end 10 years ago.
|