machine work boring a block

[zooguy]

i want to take a block i have out .030 and make a 355.

i have a guy who i can get the bore part done for free from but i would have to hone the block myself. so i have 2 questions.

do i have him bore out the block to 4.029 and use the hone to get the last .001 off or does he take the bore all the way out to 4.030 THEN hone that?

#2 .... some places/people i have seen bore a block with a plate on the block bolted down to "squeeze" the block while boring it.
is that necessary? if not used while boring what are the issues that may happen?

[noice]

First off you have to have the piston that you are going to use.

Measure the barrel of the piston, basically the skirt area of the piston as this is the tightest part of the piston. A piston is actually shaped like a "Barrel" it is narrower on top to account of the heat of combustion which makes it expand.
26468

Once you have the measurement of the piston, then you can bore each cylinder to within .006" of the final dimension. Old-old-old school dudes used to finish hone cylinders by hand as they felt it was better, but it takes an entire day. You will need some measuring device as the bore will not hone perfectly straight.

The deck plate is what you are asking about, BHJ makes them, everyone should use them, but if you are only doing one motor and don't have the $750 bucks to do one, then it isn't super necessary if the engine isn't going on anywhere other than the street. Some people put washers/spacers and an old head gasket under the the head bolts and torque them down and that is what they use to distort the cylinders as if there is a cylinder head attached to the block.

[zooguy]

The deck plate is what you are asking about, BHJ makes them, everyone should use them, but if you are only doing one motor and don't have the $750 bucks to do one, then it isn't super necessary if the engine isn't going on anywhere other than the street. Some people put washers/spacers and an old head gasket under the the head bolts and torque them down and that is what they use to distort the cylinders as if there is a cylinder head attached to the block.


any one else heard of the headgasket and washers method?

the car will see some track use ... and even on the street.

[97firehawk]

If i were you I'd do what me and most others did and let the machinist do all of the work to the block. My guy used a torque plate and he finish honed it to perfection. There's no way I would ever cheap out on machine work.

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[zooguy]

the deck plate is just a thick plate right ... couldnt i just make one?

[97firehawk]

a good machinist can make one , my buddy's dad had one made for his big block mopar. Most machine shops should have them .

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[noice]

a good machinist can make one , my buddy's dad had one made for his big block mopar. Most machine shops should have them .

If the shop doesn't have a sbc bbc sbf and bbf plate then they don't need to be in business.

[CamaroZGuy]

Spend a little extra to have it done properly from a good shop so u wont have to rebuild it again in 5000 miles.

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