Early 273 intake compatibility

66fs said: "It is not the port window itself, It is the runners up to the window. I would not run a small port intake on 340/360 heads."

FYI- It looks like the 273/318 Offy dual quad being discussed here would appear to work on the MAGNUM heads. The 318/360 Magnum head intake port is considerably smaller than the LA 340/360 port. Factory Magnum and equivalents- not aftermarket HP heads for the Magnum. I have some new EQ Magnum replacement iron heads and the port size difference between the Offy and Magnums is no where near as drastic as with the LA 340/360 head. But one would still have to deal with the bolt angle difference. My heads are drilled with the LA arrangement.