Desoto 276/291 deck height? rods?

Do you hemi guru's know what the stock deck height is for a 276/291 Desoto? I have been looking for awhile and have not found the numbers.
I think the Tex Smith book had it listed but my copy is 6,803 miles away.

Info I have is for a 330,341 and 345 not the 276/291. 10.375 is the deck height for a tall deck.

Also, I know BB 6.625 Pontiac rods will work with a some machining. Will the 6.800 BB Pontiac rod work to change to a higher rod to stroke ratio?

FYI, Custom pistons will be fit to the 291. Also, my crankshaft is de-stroked to 3 inches.

Thanks

 

Deck 9.54" rod 6.067"

 

Thanks sunbeam I appreciate it! I have the stock rod numbers. I am still trying to figure out if a 6.800 will work with my application.

 

You are mixing some information. The Pontiac rod swap is/was being done on the Chrysler 331 and/or 354 engines. The Desoto rod big end width is .930 +/-, where the Chrysler is .990 +/-. The low deck Desoto also has a small 2.061+/- rod journal.

A sbc rod is better suited for a low deck Desoto.

 

next obvious question is...why destroke a small cube engine?

 

You should be able to get a piston made with a 1.24 compression height.

 

I got the crankshaft de-stroked already. I assume it was done to stay within a specific racing class back in the day.

I thought Earlyhemibill ran Pontiacs in his turbo 345? My understanding is Pontiacs were .940 on the big end. I will have to look into this more. SBC rods would be great since there are thousands of options for them. Thanks for the help TR.

 

What will the CID be?

 

At .030 over on a 291 the bore and stroke would be the same as a 265 Chevy.

 

The Pontiac big end width is .995. And even though the math may show a 6.8 rod is possible, it might not be physically possible.
Another thing not mentioned is if the stock journal diameter was kept with the destroke.

 

He hasn't said what the stroke is.

 

3 inch. It is stated in his opening post.

 

Ooops! 265 odd

 

That is a great question on the stock journal size. I will have to check when I get home and let you know.

George, the block I got with the crank is bored .125 over and sleeved on all 8 with a huge main girdle. I was told it was built to run very high rpm. Maybe they wanted to create a little zinger! I enjoy playing around with the Desoto's. Since speed parts are hard to come by, I'm always looking for interchangeable parts like rods...etc

 

The 259 Dodge/Plym Polys were popular to convert to hemi for Bonneville because it got them under the 260 cube limit in a Class. Maybe this was for something else.

 

I thought of that also, since with a 3" stroke and a stock bore would give them 260ci. E class at Bonneville if I remember right.

 

OK, and then someone later went with a max boring.