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Old 09-14-2010, 02:37 AM   #1
lekid
 
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Default SHP vs Little M Sportsman

Just wondering what the difference in finish product is between both block.

What kind of machining is required from those 2 blocks before assembly.

Thanks
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Old 09-14-2010, 05:19 AM   #2
CNC BLOCKS
 
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Originally Posted by lekid View Post
Just wondering what the difference in finish product is between both block.

What kind of machining is required from those 2 blocks before assembly.

Thanks

We machine alot of Dart blocks for engines builders and other shops.

95% of the time most guys want main studs installed and after installing the studs in some cases we see the housing bores tighten up, So we line hone the main line to the high side.

The blocks come with a 9.025 decks and most piston, rods and cranks require a 9.000 deck for zero deck.

Lifter bores we make sure they are to the GM tolerance of .8438 to .8443 but again most of the time most guys are asking for .904 lifter bores now and we also machine the lifter bores to .875 as well.

The cylinders may need to be bored and do need to be plate honed using the same gasket and hardware you will be using in your build.

Freeze plug and rear cam plug holes need to be chamfered.

Bottom of the cylinders should be camfered.

All the pipe plug hole should be taped deeper

Rear main bearing area needs to be deburred.

Water holes in the decks need to be matched to the head gasket.

On the 400 main line blocks fit up your oil pump and oil pump shaft and distributor to make sure that you don't need to any extra clearancing.

Thats pretty much what we do to the Little-M blocks and the SHP blocks.

And we charge for the block and the machine work 2395.00 on the Sportsman block , Billet cap block is 2695.00 and the SHP blocks we charge 1795.00

When building a performace engine everything has to be checked and clearanced to the builders specs.

Dart blocks are great foundation to start with but everything needs to be checked before assembled. I MEAN EVERYTHING
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Old 09-21-2010, 12:14 PM   #3
Awesome Bill
 
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Originally Posted by lekid View Post
Just wondering what the difference in finish product is between both block.

What kind of machining is required from those 2 blocks before assembly.

Thanks
Very little has to be done except for plate honing the block for a 4.125" finish bore. The mains are quite good and will handle all the power you can give it with the fasteners supplied from DART. But, if you want to throw away a perfect set of fasteners and install something that you think is better, the main studs can go in. Yes the align bore may have to be touched up. We put the align bore dead center, neither low or high. I leave the deck alone in case you have a touch up or 2. Depending on what type of racing your doing determines final deck height. The decks are near perfect from DART. Check all lifter bores, we have found none out, and install cam bearings and freeze plugs. Yes you can radius all sharp edges. Your request is what we do and set any block up for. So anywhere from 300.00 to 500.00 is usual to get this block ready!
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