I am trying to interpret the rules... I've pulled Div 3 for quite a while but really not that familiar with Div 4. It doesn't look like you can fab manifolds in Div 4. It also says you have to stick with same number of barrels as the original. Doesn't specifically say only one carb? From NATPA Division 3 rules.
12. Replacement carburetors with no modification of carburetor or manifold. Overhang of carburetor to manifold is not allowed. Only stock appearing manifolds are allowed.from NATPA Division 4 10. Tractors must have the stock engine, frames, transmission, rear end and axle housings or manufacturer’s replacement. Stock heads and their replacements are to remain unchanged in outside appearance. No 7 bolt main blocks in Olivers; no (12) port heads; no 99 heads; no 1600 series heads. AC - WC/WD/WD45 can use D-17 engine; IH - H, 350; M, 450. JD - A/B/G can use power blocks. No M-M 800 heads or blocks. Dual exhaust not allowed except after stock manifold. 12. Any agricultural carburetor allowed. Number of barrels, throats, venture, etc, must be that of the manufacturer for that make and model. Exception: John Deere tractors may run updated (duplex) heads, manifolds and carburetors. Interior enhancement of stock or manufacturer’s replacement manifolds permitted
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