RHS head valve train??

1wild&crazyguy said
really...if all was correct in the design, it most likely the larger after market rocker....but if u say the 273 rocker hits a 1.437-1.45 spring, then it could be the head design/copy is off some or based on a shorter spring/stem height..

No, the 273 rocker clears with a 1.44" OD spring. It doesn't clear by much (I don't think you could go any bigger), but it DOES clear.

Springs are Hughes #1110.