Deck and Squared

[Dan the man]

I have a question about decking a sbm. What have you guys had to have removed in order to get the block square? Is 0.040" to much, what's a safe amount to have removed? I would hate to order a set of KB-167's and find out that the block needs a 0.025" to get it squared. Is there a piston with a 1.790" compression height? I was thinking about running the pistons at zero deck height for compression.

 

[Dan the man]

I don't see anything?

Thanks for looking. I understand that I won't know for sure until the engine is torn down, but what options do I have if the block would need more than a 0.012" cut to square up the block. I'd like to have pistons at zero deck height for improved compression.

 

[18teener]

I have a question about decking a sbm. What have you guys had to have removed in order to get the block square? Is 0.040" to much, what's a safe amount to have removed? I would hate to order a set of KB-167's and find out that the block needs a 0.025" to get it squared. Is there a piston with a 1.790" compression height? I was thinking about running the pistons at zero deck height for compression.

Not very often (never!) That I can offer any insight.
I put KB167's in my 318. Six of the deck heights came out at zero and two were a couple of thou down. I called that good.
I would do the mock assembly and hope you are as lucky as I was.

 

[Dan the man]

Not very often (never!) That I can offer any insight.
I put KB167's in my 318. Six of the deck heights came out at zero and two were a couple of thou down. I called that good.
I guess I was lucky.

That's great. I'm thinking about using KB167 's with promaxx heads. The promaxx offers more for the money than the speedmaster's. Promaxx heads come with a 5 angle valve job and hand blended bowls.

 

[Ted265]

?
I doubt you would need to cut 0.025" or even 0.012" to get them cleaned up & square, you might need to cut them 0.012" to get 0 deck though - depends what the deck height is when you start.
If it has been heavily decked before and your starting with a low enough deck height for the KBs to sit proud then you can have the piston crowns machined (within reason)

 

[dusterbing the peace]

True them up, can raise the heads up with thicker head gaskets if needed

 

[Bakerlite]

Measure the deck heights with one of the stock pistons and rods. Then do the calculations from there and look at your options.

 

[MOPAROFFICIAL]

Probably no more than .015 to get them squared. On average I've found blocks to be .004-.008, only a couple were in the .012-.014 range.