Cylinder Head GM Cast Iron
When ordering a GM 2.5L head you will find that the casting nuber is the same on many differentheads. The location of the boolt holes are different, as see
n above, the length of the valves and the size of the valve stems ate different even on the same casting. You and your customer must check and make sure you have ordered the correct head before installing it on the
car.

2.5L R-373 call for availabilty |
1982-83 |
HAC 2.5-373R |
295 |
2.5L R&U-496-10101496 |
1990 |
HAG 2.5-496 |
295 |
2.5L R&U-485-10044485 |
1990 |
HAG 2.5-485 |
295 |
2.5L R-552 call for availabilty |
1982-83 |
HCG 2.5-552R |
295 |
2.5L R&U-655-10044655 8mm valve |
1987-1988 |
HAG 2.5-655 |
295 |
2.5L R&U-514 |
1990 |
HAG 2.5-514 |
295 |
2.5L R&U-10044642 |
1990- |
HAG 2.5-642 |
295 |
2.5L R&U (702) Wide call for availabilty |
1982 |
HAG 2.5-702 |
295 |
2.5L R&U767 11/32 valve |
1986-1987 |
HAG 2.5-767 |
295 |
2.5L R&U-10038806 |
1990 |
HAG 2.5-806 |
295 |
2.5L R&U-808 Shot vale 8mm |
1987-1988 |
HAG 2.5-808 |
295 |
2.5L R&U 10038808 11/32 valve |
1990- |
HAG 2.5-808 |
295 |
Note on rear wheel drive cars the core pluge are located on the other end and must be swapped.
call for availability of casting #