Re: The old V-12
 

Barry, found this chart in an old GMC maintenance manual. Should give me some help of at least getting close to the right size. I guess a guy could get a hole bored for a bigger one if thats all he had.

Re: The old V-12
 

On the other hand I guess that's only 38 ten thousands between the smallest and the largest anyway on an well used engine.:ohgeesh:

Re: The old V-12
 

Well starting to get the parts gathered up. heres the block with 3 pistons still stuck. In the last 25 years while it has been setting they have not fallen out:headscratch:

Re: The old V-12
 

I have pulled the pistons from the 351 motor that I got for that purpose so I have a block, cam and crank that looks fine if anybody needs them.

Re: The old V-12
 

Found Ya', Blackie:

Enjoyed the visit tonight. One thing I forgot to mention. Be sure to remove the head gaskets as careful as possible and save them. I haven't been able to find any new ones, so have reused the old ones by using lots of gasket sealer after cleaning them real good.

I'll try to keep up with your progress, here. Looks like the biggest challenge right now is getting those last three pistons loose and out of the 12.

The matching replacement pistons you have are like pure gold if you need them.

Cayoterun

Re: The old V-12
 

Coyote run and or blackie are those head gaskets on the v12 the thin copper ones?. Just curious. I save and reuse the 305 ones because the are about .025 thinner and with a .035 taken off the head add about one point to the compression ratio. Barry

Re: The old V-12
 

I believe mine were the ones with an asbestos layer between two thin metal top and bottom. But I like that idea to increase compression.

Re: The old V-12
 

The old 305 a .and some of the truck c engines use a thin copper head gasket like old flat head fords. They are about .010 thick. They are bigger than the 351 bore. Just curious if they used them on the v12. Barry

Re: The old V-12
 

So you're saying that gasket would work on maybe a 379 too?