Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: Rebuilt 390 FE
It could be the carbon, but to me, it doesn't look like the chambers are identical. The casting on the C1AE is listed as 71cc, what isn't written on the C4AE is that it's chamber could be 71.2 to 74.2 depending on casting. Is it workable? Of course, but Ford had a reason for changing the design. In all actuality, the heads on a 69 Torino with a 390 are probably a C8AE-H... which are also 8 bolt.
I'm a stickler for a drive train being symmetrical. If you look up the horsepower ratings on an engine, you'll often see changes from year to year, one of the most common ways to gain power is through the heads. The 63 to 65 version of the engine was rated for 250 to 266 HP with a 2 barrel and about 330 with a 4 barrel, depending on which car or truck it came from. The later versions had about a 10 horse gain across the board. The primary difference is air flow through the engine since the bore and stroke really doesn't change, but the compression ratio probably does. For short cruises it probably won;t make a difference, but if you run a couple of long hauls or some extended periods of aggressive driving, one side may run hotter than the other.
I could be wrong on this, but I thought that FE's all had 8 bolt exhaust manifolds that were top to bottom. The Windsors were 8 side to side. How many bolts are on your exhausts and what pattern?
Cool car, BTW.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?