When decking is done to a block at the shop they cut only over the cylinders deck surface only OR the cylinders surface and the top(where the intake sits)????
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In our shop what ever we take of the deck we times 1.7 and cut the top of the block where the intake sits.

On our own blocks that we prepare for the engine shop and if we know that we are cutting the heads a lot most of the time we cut the top of the block .125 as when we cut the heads we correction cut the intake face of the head so the customer can buy any intake out of the box and it should fit.

Hey Carl...what if your cut one side more than the other? I know you square it up off the crank.

If you have to cut one side more than the other just means the block wasn't square to start with.

Originally posted by bigjimzlll:
Hey Carl...what if your cut one side more than the other? I know you square it up off the crank. When decking the blocks in our CNC machine the decks are cut the same on both sides thats the way the program is written.

both sides = square

Carl, I just had my block 0 decked. Will I have a problem with intake fit?

Thanks

Originally posted by blumont:
Carl, I just had my block 0 decked. Will I have a problem with intake fit?

Thanks No I don't really think that you will have a problem I don't know what zero deck is but if its 8.990 and up you should be fine as most felpro peformance intake gaskets are thin and it helps on those applications. Just make sure that the intake doesn't set on top of the block.

Sorry for the late responde.The pistons we are looking to buying are TRW L2489F with 1.420 compresion height = .030 down the hole .
We want to use flat top pistons for a 68cc aluminum heads and stay around 10:5:1 - 10:8:1 compresion ,or I better start looking for another set of pistons that can save me the block decking by bringing the pistons closer to the top ???something like .005 will be my goal if you guys know any part #s that will be great :D

Any particular rod length & stroke? ;)

Hi Mike ,this is a 406 my brother wants to built , 3.75 stroke crank ,5.7 rods

Originally posted by rcatala:
Hi Mike ,this is a 406 my brother wants to built , 3.75 stroke crank ,5.7 rods =
You are going to have to cut the block to get the piston where you want it.
Most of the aftermarkets like JE/SRP, etc are 1.425 for the 5.7" rod which doesn't help much.
Almost all the blocks we do end up at about 9" or 9.005" with a few exceptions like the 3.5" stroke stuff & some other odd ball ones. ;)
If it was a 4" bore you would have the option of a shim gasket but it won't work with the big bore.

I think both KB Hypers and KB Forged slugs have 1.433 compression height. That would make zero deck at 9.008 or .017 down the hole on a standard block, right?

That would be somewhere around 10.7:1 CR with .041gasket, 68cc chambers and 4.8cc Flat Top pistons, .017" down the hole. Unless I miss-calculated something, but it should be close.

That is, with the KB751 Pistons.

Originally posted by Slowpoke70:
I think both KB Hypers and KB Forged slugs have 1.433 compression height. That would make zero deck at 9.008 or .017 down the hole on a standard block, right?

That would be somewhere around 10.7:1 CR with .041gasket, 68cc chambers and 4.8cc Flat Top pistons, .017" down the hole. Unless I miss-calculated something, but it should be close.

That is, with the KB751 Pistons. =

Correct, KB is one of the the "exceptions" :D

We also do a lot of custom stuff where the block ends up at different heights but most of the shelf stuff is around 9" for a zero deck.

Thanks for all the information ,no doubt I got to deck the block to get the correct quench .043 " and step up to more compression
.

Quench area is really very important went building a SBC motor ?

Originally posted by rcatala:

.

Quench area is really very important went building a SBC motor ? =
Yes ;)