help with pistons for 6.2 block
06-03-2010, 02:53 AM
#1
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help with pistons for 6.2 block Ok I have a block that is "new". Its a block thrown out for defects. I am wondering what the smallest pistons I can use with this block. I know I will probably have to have the machine shop tell me for sure but I was trying to figure out the smallest pistons I can use for this block.
I have a set of pistons I picked up for cheap but I am thinking they wont work. They are 4.070 weisco pistons.
The note I have with the block says:
New block decks look like they would be ok. Cylinders have just been rough bored Not finished honed and checks about .004 to .005 small. #'s 5 & 7 cylinders check about .007 big checking them at 4.065. Line hone checks about .002 to .003 small checking it at 2.751.
I dont know alot but Im guessing from that I will need larger pistons than 4.070. Anyone that can put some input into some pistons that might work or let me know if its possible that these pistons will work. Im not sure if the pistons are 4.070 and need to be bored slightly larger. What is the standard gap between pistons and the cylinder walls? I am wanting to hit this with a large shot of nitrous up to about a 300 shot. Also what rings should I use for this setup. The part # for the pistons is K448F7 I believe or 6448LF7 but I believe the first one is correct.
Also what bearing do you use with a forged crank? Are they any different than the normal bearing?
I have a set of pistons I picked up for cheap but I am thinking they wont work. They are 4.070 weisco pistons.
The note I have with the block says:
New block decks look like they would be ok. Cylinders have just been rough bored Not finished honed and checks about .004 to .005 small. #'s 5 & 7 cylinders check about .007 big checking them at 4.065. Line hone checks about .002 to .003 small checking it at 2.751.
I dont know alot but Im guessing from that I will need larger pistons than 4.070. Anyone that can put some input into some pistons that might work or let me know if its possible that these pistons will work. Im not sure if the pistons are 4.070 and need to be bored slightly larger. What is the standard gap between pistons and the cylinder walls? I am wanting to hit this with a large shot of nitrous up to about a 300 shot. Also what rings should I use for this setup. The part # for the pistons is K448F7 I believe or 6448LF7 but I believe the first one is correct.
Also what bearing do you use with a forged crank? Are they any different than the normal bearing?
06-03-2010, 04:41 AM
#2
Order a 418 stroker kit for Texas Speed. It's 4.080 bore and 4" stroke. Have the block honed for those pistons. You will get the bearing and rings you need with the kit.
http://www.texas-speed.com/shop/item...d=887&catid=88
http://www.texas-speed.com/shop/item...d=887&catid=88
06-03-2010, 04:48 AM
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Staging Lane
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I figured I would have to get different pistons. I already have a crank and connecting rods so I dont need the kit. Just wondering what the smallest piston I can get away with but I am guessing that It is going to be the 4.080.
06-03-2010, 05:52 AM
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Ok thats cool I was just making sure cause I wasnt sure if the pistons themselves are 4.070 or thats the bore that they are made for cause it looks to me the two cylinders are 4.072 and I wasnt sure about how much of a gap is run between the piston and the walls with a 300 shot.
