Yup, 667 horse, 1964 high rise heads and 1964 2X4 intake. I'm not sure those new "modern" Edelbrock heads or whatever have a BIG advantage over the stock high riser units. My heads are not "ported" or "polished", just good ol' 64 iron (sodium valves)! The pistons are identical to what they had back then, 12.5 to 1 compression (when you could actually buy 100 octane).
So how in the heck can it produce THAT much horse power? Gotta be the 427's were underated "back in the day" at 425 horse. That had to be for "insurance reasons"!
OR,,, could it be the modern roller lifter camshaft? Maybe thats all it is. Anyway the only part that "broke" on my engine WAS the freakin' modern roller lifter!
Engine's out now, rebuilding with lower compression pistons and a flat tappet cam. Smaller carbs with vacuum secondary. I got to "tame" this beast, at 667 horse I was barely able to drive it on the street!