View Full Version : V-8 Block Deck Thickness

03-23-2005, 08:32 PM
Anyone know the block deck thickness on the 259/289 V-8 and the cylinder bore centerline dimensions?

Start and Stage Your Studebakers

03-24-2005, 12:03 AM
The bore centerline is 4.5 inches. I will need to look to see what the nominal deck thickness is. You should measure it if you need to know for sure on a particular engine. By the way the deck height is 10.065 /10.060 as it left the factory.

David L

03-24-2005, 09:04 AM
Ok thanks, the new GM Rocket SBC racing blocks have a .625" thick deck with .275 cylinder walls and I was curious as to how an old Stude block compared.

Start and Stage Your Studebakers

03-24-2005, 04:06 PM
I went out in the garage and measured 2 V8 blocks I happen to have sitting there. Tough to get an exact measurement given the figure with the tool I had at hand but it looks like they're a shade over .4" in thinckness. I measured anywhere from .4" to .425"

Miscreant at large.

03-24-2005, 06:38 PM
Mr. Biggs, for those of us who are uninformed as to what term "deck thickness" means, can you enlighten us?

1960 Lark Convertible
1962 GT Hawk

03-24-2005, 06:44 PM
Deck thickness = the distance between the top machined surface of the block (head gasket sealing surface) and the very uppermost part of the water jacket. Thicker = better for strength, although not necessarily for weight or heat transfer.


55 Commander Starlight
62 Daytona hardtop

03-25-2005, 12:10 AM
The area next to the cylinder walls is 11/32 or about .344 per the drawings. There is of course some tolerance on this so they can be thinner or thicker. When I get a chance I will measure a few blocks to see how they check out.

David L

03-25-2005, 08:14 AM
Thanks for the interest on this. Has anyone cut up a scrap block into segments for close study? I have cut a head up and the "autopsy" was quite revealing as to where the meat and bones are in the structure. The more I study these blocks the more impressed I am with the standard 232 block size especially for superboosting.

Start and Stage Your Studebakers

03-25-2005, 02:46 PM
Unless you have a useless block I wouldn't like to see on cut to check for thickness. If someone wants to know some dimmensions I can supply them. I have never seen a block that had less thickness than specified. You can also use ultrasonic testing to find out how thick an actual block is in various locations.

David L