Going to take a crack at Index racing next year

RockinRobin said

Didn't realize it was a restrictor plate. Too much trouble constantly taking it on and off to run index then bracket then index, etc. Need to find a throttle stop for 4500 carb size. Everything I've seen so far is for 4150.

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They make one for 4150 and one for 4500. It’s more or less a 1” spacer that’s an adjustable restrictor plate. When I installed it on my car and left it wide open the car ran the same as it had with a normal 1” spacer. I have the 4150 version so I would think the 4500 version would be the same. Only takes a few seconds with a 1/2 socket to adjust the restrictor plate.