Isit because of the valve opening distance and the makeup of the cam shaft?
no
Two. The standard Ford 302 and the 302 HO VIN M.
The Ford 302 H.O. firing order is the same as a Ford 351 engine. It is 1-3-7-2-6-5-4-8. It is totally different from a standard Ford 302.
you
The Ford 302 has two different firing orders depending on the engine. Standard Ford 302 = 1-5-4-2-6-3-7-8 Ford 302 HO = 1-3-7-2-6-5-4-8
One way is the firing order. The 302 HO has the same firing order as the 351. So, if the firing order is 1-3-7-2-6-5-4-8 you have an HO engine. If the stock manifold is on the engine, it will say "5.0 Ford HO". The exhaust manifolds were factory tubular headers. They had roller cams.
Yes, if it's a 302 and not a 4.6 like in the newer mustangs the 302 and all aftermarket 302 heads should fit.
The intake on the 1979 Ford 302 engine is different than the intake on the 1993 Ford 302 engine. The intakes are not interchangeable.
There is an alternate firing order for a 302 HO engine. Standard Ford 302 firing order is 1-5-4-2-6-3-7-8, HO versionis 1-3-7-2-6-5-4-8
A Ford 302 engine, yes. A Chevrolet 302 engine, no.
Very simply...it turns it into a 302 HO. It also changes the timing of the 302 to the timing of the 351.
302