Ok here are the new rules for this class.
5.B.2.a American Gas Roadster – C/AGR (Gas only)
This is a single displacement engine class only. All rules which pertain to the existing Fuel/Gas Roadster class, 5.2.B, above will be enforced in this class. The engine used must be an American Automotive Production or Light Duty Pick Up Truck engines produced prior to 1973. The maximum engine displacement is 372.99 cid (6.111 L). The engine can be of a larger OEM displacement and reduced to the class maximum by reducing the bore and/or stroke. All engines in this class must run OEM iron blocks and cylinder heads. The burden of proof as to the origin of the engine components lies with the competitor. Induction can be either carburetors, mechanical fuel injection. Ignition must be a single magneto or points distributor. No EFI, computer controlled ignition, data collection, etc. computers are allowed.
Engine class allowed: C
The concern I have for this class is very simple. The way I read the rules it only requires American Automotive Production (OEM) castings for the heads and block produced prior to 1973. It does not say they have to remain in original configuration. Now we will have people raising the ports on OEM heads just like they did back in the early 70's in Pro Stock class at the drags. It also does not say you cannot have a sheetmetal intake. etc.
Without stricter rules on this class, you will see this class go the way the vintage engine classes have gone. $$$$$
IMO it should have included, Factory Crankshaft, Factory rocker arms, No Titanium valves, No sheetmetal intake manifolds, only cast factory or cast aftermarket intake manifolds, that match original factory gaskets. Head ports must align with original factory gaskets, Cam lift multiplied by rocker arm ratio limited to no more than .600" valve lift, OEM rod and main bearings for specific year of motor block, example chevy 400 block must use 2.65 main bearings and not sized down 350, 2.45 main or 283, 2.30 main. Oil system must be wet sump, Combustion chambers must be original factory CC's, etc. With rules like this it would make for some fun racing and keep the costs down.
Tom G.