Home › Forum › Ask A Member › "Newer" 25/35hp OMC compatibilities › Re: "Newer" 25/35hp OMC compatibilities
That is correct. 1978 parts only for a 1978. 1978 has 12 bolts and later have 15 bolts.
The warp is from where the exhaust strikes the centre of the plate in two spots. One will be distorted more than the other.
Simple task of gently flattening the "Bumps" out with a rubber mallet or similar. Best done on a folded blanket on a flat surface. Gently gently.
The warp then turns into a twist which can be corrected by hand.
It will sit flat on a sheet of glass in no time.
Check water gallery into block, use new gaskets and bolt it up.
Once bolted up it will not leak and the plate will distort as it wants without shifting on the bolts at all.
If you use aluminium you are asking for further trouble down the track.
If a new plate was available and installed…….then pulled off again 12 months later……it will be warped when sitting on the workbench……nature of the beast.
Cheers
B