250-287-327 V8 casting variations

Hi all, long time reader occasional poster here. I've been doing some digging for a while now and cannot seem to find a definitive answer. Are there variations in the cylinder wall thickness for 250, 287 & 327 Gen 1 V8's?? I'm looking at buying a 287 from a 66 Classic to twin turbo for my Rebel, question is can it be bored to 327. I'm planning on putting 20-25PSI through this block so beefiness is key.

I have read some people say only the early 287 blocks have the thick cylinder walls..

Thanks everyone for your time

I would like to get a definitive answer on this also, I am planning on doing this exact same thing. My 287 is at the machine shop waiting to be tore down for machining, I think a lot of shops don't want to take that much out of the cylinder walls because of the work involved, so they say it cant be done. I would like to know for sure. I will let you know what my shop says.


Jason
66 classic

Thanks for the reply, So the stories about all the gen 1 blocks being cast the same are incorrect? What about the other parts like the crank and rods, Will they interchange?

Jason
66 Classic

my 64 287 was not thick enough. I used a pair of calipers and checked the thickness slipping it down around a water jacket hole.

With twin turbos I doubt you'd notice a lot of difference between the 287 and 327.
Three different castings for the three blocks. There is 1/4" difference between bore of all three (3.5", 3.75", 4.00"), why would anyone cast a block with more than 1/4" thick cylinder walls.... unless it's a super heavy duty diesel.

I'm skeptical that any early thick cast blocks actually exists as well. Even for testing, why cast a block like that? Sleeving a 327 would be much cheaper to test with, and AMC wasn't known for wasting resources. A 3/8" cylinder wall block just makes no sense, for any practical purpose.