Got a 6.0 iron block bored 0.005, confused on choosing pistons??
02-22-2010, 06:19 PM
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Got a 6.0 iron block bored 0.005, confused on choosing pistons?? So I'm trying to figure out what piston specs I need for my engine build.
6.0 Iron Block, cylinders bored to 4.005
Looking to go with a 4.0" Callies Compstar stroker build, and want to use Wiseco dished pistons. But what size of pistons do I need, and what will my displacement be? I thought it would be a 403, but someone told me I won't be able to use "4.005 bore, 4.0 stroke Wiseco pistons (K456X05)" and would have to go to a 30 over bore for a 408?? I'm confused.
This is the rotating assembly I was looking at: http://www.texas-speed.com/shop/item...d=885&catid=88
So the diameter of the pistons is 4.005, same as the cylinder bore, therefore the piston diameter will be too big?? Is that what they were trying to tell me? Or is the 4.005 piston spec'd for a 4.005 cylinder bore? Thanks
6.0 Iron Block, cylinders bored to 4.005
Looking to go with a 4.0" Callies Compstar stroker build, and want to use Wiseco dished pistons. But what size of pistons do I need, and what will my displacement be? I thought it would be a 403, but someone told me I won't be able to use "4.005 bore, 4.0 stroke Wiseco pistons (K456X05)" and would have to go to a 30 over bore for a 408?? I'm confused.
This is the rotating assembly I was looking at: http://www.texas-speed.com/shop/item...d=885&catid=88So the diameter of the pistons is 4.005, same as the cylinder bore, therefore the piston diameter will be too big?? Is that what they were trying to tell me? Or is the 4.005 piston spec'd for a 4.005 cylinder bore? Thanks
02-22-2010, 06:22 PM
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unless you are planning on the doing the machine work yourself I would leavet these details up the machine shop. Just make sure they have all the necessary information
02-22-2010, 06:59 PM
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Is the block bored OR final honed to 4.005? If it is bored then your gonna have to go .030 over, if it is final honed it might be close to using the pistons. I would check the manufacturer install specs(get a print out) for the pistons and talk to your machine shop about it. They can tell instantly with a few measurements of the block if the pistons will work.
A good shop will mic the pistons and then final hone the block to the piston manufacturer's specs or set them up how you want, ie loose or tight. If your unsure about it talk to the shop, dont want to buy something that wont fit in your block.
A good shop will mic the pistons and then final hone the block to the piston manufacturer's specs or set them up how you want, ie loose or tight. If your unsure about it talk to the shop, dont want to buy something that wont fit in your block.
02-22-2010, 10:53 PM
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as far as I know it's just been bored to 4.005, more likely than honed to 4.005. At least when I purchased it that's what the guy had told me. The description I was given were... shot peened, hot tanked, decked to 0.005, and bored 4.005 over.
02-23-2010, 11:37 AM
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a 10cc Wiseco dish piston wouldn't lower my compression enough, so I'd need something along 15 to 20cc. Wiseco has the 4.03 15cc or 20cc piston for a "408." But couldn't I just use the 4.005 "402" pistons and just have them hone the cylinders to get them to fit with those pistons? The thinner the cylinder wall the less I like the idea.
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02-23-2010, 02:25 PM
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a 10cc Wiseco dish piston wouldn't lower my compression enough, so I'd need something along 15 to 20cc. Wiseco has the 4.03 15cc or 20cc piston for a "408." But couldn't I just use the 4.005 "402" pistons and just have them hone the cylinders to get them to fit with those pistons? The thinner the cylinder wall the less I like the idea.
02-23-2010, 03:03 PM
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Guys, the 4.005" bore size is a common piston in the LS world. I have built MANY 4.005" bore engines. Just have a compotent performance machine shop look at the bores and measure them with a dial bore guage. You DO NOT have to go .030" over. Common bore sizes for an 6.0L LS based engine are 4.000", 4.005", 4.010", 4.020", 4.030", 4.040", 4.060". More than likely the block has been final honed to 4.005". I could put you together a rotating assembly to perfectly fit whatever situation you find yourself in.
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02-23-2010, 04:12 PM
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.005 is a hone. They just took your block and rehatched the holes.
I went .030 on my turbo build because I found a good deal on some .030 pistons. That number doesn't mean anything to me, other than it's going to be a 408. If your block is power honed to .005 right now and you've already paid to have that done then it'd be more cost effective at this point just to find a piston that fit. If they don't offer the piston you want in .005 they can make it for a little more money.
I went .030 on my turbo build because I found a good deal on some .030 pistons. That number doesn't mean anything to me, other than it's going to be a 408. If your block is power honed to .005 right now and you've already paid to have that done then it'd be more cost effective at this point just to find a piston that fit. If they don't offer the piston you want in .005 they can make it for a little more money.
02-24-2010, 05:42 AM
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In my experience, most machine shops want the piston before doing the final hone just so they can be sure the bore is optimal for the pistons you choose.
Those saying the machine shop is your best bet for measuring it and verifying a set of pistons will work are right on the money.
Those saying the machine shop is your best bet for measuring it and verifying a set of pistons will work are right on the money.
02-24-2010, 09:19 PM
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I agree man. Those were actually the pistons I was wanting to order (20cc). Gives me the flexibility of compression (low 9's or high 9's) with different sets of heads. How are you liking that 402 turbo setup? Have you ran it without the boost before? Just curious since that'll have to be what I do for another year lol
02-24-2010, 10:33 PM
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ha ha havent even started it yet still have to finish some other stuff but I bet it would very close to 500fwhp with my patriot stage III ls6 intake and a fairly healthty cam.
