block casting 25524140 specs

[blackgn1]

Does anyone know the specs on a block casting 25524140? Looking for crank, rod, and piston information. I do think the beck height is different than a 109 block. Thanks for any information.

 

[bison]

The only thing different is the deck height. The pistons in the turbo applications were slightly heavier. All other dimensions are the same. They used a .017 compressed steel shim head gasket on the taller deck blocks.

 

[blackgn1]

This engine came out of a NA Regal. Bison is it safe to assume that there is no turbo crank inside? Also whats the best approach to change over to a turbo application? I have had no experience with different deck heights or non 109 blocks. This is this winters budget build!:biggrin:

 

[Turbo-Archie]

You just need to get the correct pistons, just like an 84-85 turbo block..




..

 

[bison]

This engine came out of a NA Regal. Bison is it safe to assume that there is no turbo crank inside? Also whats the best approach to change over to a turbo application? I have had no experience with different deck heights or non 109 blocks. This is this winters budget build!:biggrin:

It will have an NA crank. I'd run it if I was only looking for high ten sec power. The pistons will need replacing and the assembly will need balancing. Mill out the first 3 threads in the deck on each hole and be sure to use the correct length fasteners. It may use a different cam bearing dimension but I can't remember for sure

 

[BRAD_PADGETT]

I just had this block rebuilt with a turbo crank and pistons. If you want a copy of the machinest build sheet let me know. Brad

 

[blackgn1]

Brad I would really like those specs. Thanks guys. The knowledge here is priceless!

 

[blackgn1]

Bison does milling the deck make it possible to use the 2 dot stock rods from a 109? I'm thinking about using the the NA crank and a set of 2 dot rods I have. Will that give me the right piston height in the bore? I'm mostly lost in this procedure. I have 3 109 blocks but want to use the block that came with the car.

 

[buickspec6231]

I just had this block rebuilt with a turbo crank and pistons. If you want a copy of the machinest build sheet let me know. Brad

If it's not too much to ask, I would also be interested in a copy of the machinest's build sheet. I am currently working on rebuilding my 140 block.

 

[Squid4life]

I am still using the 2 dot rods that came in my 4140 block, so yes they can be used. It has TRW forged pistons, I will see if I have pics of the part # to see if they were anything special or just your typical turbo buick pistons...

 

[bison]

Bison does milling the deck make it possible to use the 2 dot stock rods from a 109? I'm thinking about using the the NA crank and a set of 2 dot rods I have. Will that give me the right piston height in the bore? I'm mostly lost in this procedure. I have 3 109 blocks but want to use the block that came with the car.

The rods are all the same. To get the piston up I'd run a set of pistons with a .927 pin and full float them. I'd offset bore the bushing lengthening the center to center. I would not mill the deck more than it needs to clean it up.

 

[ttaowner]

it will have an na crank. I'd run it if i was only looking for high ten sec power. The pistons will need replacing and the assembly will need balancing. Mill out the first 3 threads in the deck on each hole and be sure to use the correct length fasteners. It may use a different cam bearing dimension but i can't remember for sure

i think you mean counter bore

op seamed confused to what you meant (SEE POST #8)

also i thought all 4.1 's had the turbo cranks? Rolled fillets on mains and rods?

 

[bison]

i think you mean counter bore

op seamed confused to what you meant (SEE POST #8)

also i thought all 4.1 's had the turbo cranks? Rolled fillets on mains and rods?

What I posted is exactly what I meant. Full float and start with a smaller id bushing and increase the center to center length to get the piston near the top of the bore. The discussion was about a 3.8 bore NA engine. Nothing about a 4.1. When I got a lot of the 4.1's in the mid to late 90's about 10% had been remanufactured and had 3.8 NA cranks in them.