4.250 stroke in an ls1. with resleeved cylinders to 4
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4.250 stroke in an ls1. with resleeved cylinders to 4
i need to know what needs to be done, so i can fit a 4.250 stroke in a 4 bore ls1 block. im buying this block and it needs a quick hone, for me to achieve a 427 i need a 4.250 stroke. they offer these but i dont know if theres any clearance issues, does my shop has to blue print the block to achieve this, all i want to know is can i do this and what needs to be done?
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i mean if they offer the crank, it can be done safely then right? dont know cause this car is going to be street driven but to the track couple of times a year, it will not be daily driven, more like a friday saturday and sunday car lol, need to get the ls1 masters in here for their opinion
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Good luck clearing typical ls1 pistons to the crank/reluctor wheel. You are going to need custom longer sleeves or maybe a small deck spacer. But hell, if you have to go to that trouble, go ahead and do a 4.190" bore x 4.400" stroke. Hello 485 CI. Doubtful you are going to pull it off in a "normal" setup.
Brandon
Brandon
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Originally Posted by themack56
so what do you think. should i just go with a 4 stroke and just do a true ls1 402?
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i already have the ls1 block and it was resleeved by the previous owner, it needs a quick hone, and vuala perfect, dont see whats wrong with using an ls1 over an ls2 block
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#8
Actually, you need something like a 4.175 stroke. This is a common Ford size for their 9.5" and 9.2" deck height blocks. Lunati makes a 4.185" crank. Although they offer the crank, they don't offer a rotating assembly with it. And the crank may not be a stock item. You will probably need custom pistons for the right compression height.
#9
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The 4.250" stroke can be done in the LS1 block with stock sleeves. The ring placement is something left to be desired, but it can be done. I believe G-force racing on here has a Impala with this set-up. Personally I wouldn't do it, but it's your baby and your wallet. I'd go with a Eagle 4.100 stroke personally. Save yourself $1500 on the crank and another $500 or so on custom pistons. You'll also save tons of time.
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Just built one of these about 6 months ago. Had to use a small journal crank, custom Oliver billets, and a super thin piston. Very expensive stuff, not to mention the custom work on the block. Spare yourself.
#12
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4.125" is as much as I would go. I've used that stroke in an iron application and the piston was certainly custom.
Ring pack and pin location weren't the greatest but it makes good power.
Ring pack and pin location weren't the greatest but it makes good power.