Originally Posted by 440Jim
Originally Posted by gregsdart
Jim, my header flanges are for the 572-13 heads, and gaskets will be fit to the ports if need be.

I have notes on several intake port sizes, but not much on exhaust ports. Some port jobs will be a little different, too. I was going to compare your finished exhaust port dimensions (572-13 CNC 385) to what the guy put on my B1 heads.
Originally Posted by "various"

Intake port openings:
1.260 x 2.300 Indy SR (gasket 440-212) Indy website
1.340 x 2.630 Max Wedge (Felpro gasket)
1.340 x 2.650 Indy 440-1 (gasket 440-216) Indy website, for their intake manifold gaskets 3.55sqin
1.375 x 2.650 Indy 440-1 (CNC 345), 3.64sqin-0.335 corners 3.31
1.475 x 2.700 Indy 572-13 (gasket 440-218) Indy website, for their intake manifold gaskets 3.98sqin
1.600 x 2.660 B1 original (from gaskets bought from Koffel's Place) 4.25sqin
1.750 x 2.730 Jim's B1 originals CNC ported (previous owner, unknown shop) 4.78sqin-0.335 corners 4.44sqin

1.835 x 2.050 Indy Hemi (gasket 426-258) 3.76sqin

Exhaust ports:
1.550 x 1.960 Indy 440-1 (CNC 345), 3.04sqin-0.335 corners 2.70
1.xx x X.xx Indy 572-13 (CNC 385), sqin
X. xx X.xx B1 original (from ) sqin
1.710 x 2.070 Jim's B1 originals CNC ported 3.54 sqin, 3.206 sqin (curved sides)

Jim, 572-13, 1.90 wide, 1.60 tall.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky