Are there any physical differences between 350 and 455 starters? I've tried searching and can't seem to find anything other than a slight power advantage with a 455 starter, and that was on Rock Autos site so I'm not even sure that is true. Can someone tell me if there is really any difference? I know there is left and right side starters, but I'm only looking at drivers side starters.

 

I am not aware of any physical difference between the starters that would prevent one from bolting up to any Olds block.

There were application differences where high compression engines got high torque starters and therefore the starter armature was different (larger) but that didn't affect the ability to bolt it to the block.

 

This thread should answer your question.

- Eric

 

Thanks for the info, guys

 

The only RWD Olds starter that is physically different is the diesel starter. The case is longer. As a result, the driver's side motor mount is moved forward using an adapter plate bolted to the normal motor mount holes in the block to allow starter clearance.

 

Not true Joe. The starter on a 260 is about 2/3 the size of the standard starter and struggles with a 350. It won't even think about turning a 455 over.
Been there, done that.

 

Yeah, fair enough. I was fixated on "too big to fit", not too small to work.

307 starters are also smaller in diameter, but again will bolt into any RWD application.

 

And my 307 starter struggled on a low compression 403. I will have to take a look at the starter on 70, see if the 350 or 260 starter was used. I think there is a 350 starter on my shelf and I plan to keep manifolds on this car.

 

Good info here, thanks again!