[BRENT in 10-uh-C]

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Originally Posted by nick c

I made my own exhaust header and down draft intake manifold. I measure the gasket and block. It is my take that all the blue prints I've seen are in fractions.
My mill has dro and it likes decimals, I used a 12" dro calipers.
I used 3/8" x 2" x 18" CR, it leaked on both far ends on outer exhaust ports, had to remove and fix. I suggest you might use 1/2" thick CR x 2.25 wide for strength. Heres how I did mine, start with 18" bar, find center 9" on bar, now measure out 1.656 to left and right to exh, now out to 3.218 to the bolt holes, now 4.781 to the 2 intakes, now 6.343 to 2 bolt holes, now 7.906 to the last 2 exh ports, all these are fractional.
I bought all tubing from Columbia River mandrels.
carry on

Thx, you got it covered.