Ive tried to find stroke,rod lenth and piston compression height specs on GNTTYPE but didnt. I know they will have to be ground for the off center and the cank pin is larger. Im thinking about a steel crank so the crank pin to 2.100 shouldnt be a problem. I have a set thats been collecting dust and its use them or sell them any ideas???
chevy 6" rods in a 109???
- Thread starter chevyII
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750H.P.V6
Brutal 6 Racing
- Joined
- Sep 4, 2001
- Messages
- 3,610
Chevy II,
The stock stroke length is 3.400", the stock rod is 5.960" and the compression height is 1.850" or there abouts. I have a stock stroke steel crank ground for 2.100" journals myself. The 6.0" rods should work fine but the change in length (+.040") will increase the compression ratio all other things being the same. Another concern is that the pin dia. for a Buick is .940" and a SBC is .927". If you order a custom piston it's not a big deal.
I hope this helps
Neal
The stock stroke length is 3.400", the stock rod is 5.960" and the compression height is 1.850" or there abouts. I have a stock stroke steel crank ground for 2.100" journals myself. The 6.0" rods should work fine but the change in length (+.040") will increase the compression ratio all other things being the same. Another concern is that the pin dia. for a Buick is .940" and a SBC is .927". If you order a custom piston it's not a big deal.
I hope this helps
Neal
turbo nasty
Turbo Dojo / MNTR
- Joined
- Jul 19, 2001
- Messages
- 9,478
yep custom pistons will be needed.
Is offsetting the rods a big deal for a machine shop,cost? With a 1.8 compression height that should be ok to move the pin higher I think the pistons are stable to about 1.250. All i nedd now is a BMS 3.4stroke with 2.100 pins-needle in a hay stack
750H.P.V6
Brutal 6 Racing
- Joined
- Sep 4, 2001
- Messages
- 3,610
Chevy II,
You're right about the pin height. There is a lot of room there but when the compression distance ends up in the 1.200" range (ie: long stroke w/ 6.500" rod) the piston pin will be in the oil scraper ring groove. BTW, I have the crank you're looking for and several sets of different length rods also. Drop me a line.
Neal
You're right about the pin height. There is a lot of room there but when the compression distance ends up in the 1.200" range (ie: long stroke w/ 6.500" rod) the piston pin will be in the oil scraper ring groove. BTW, I have the crank you're looking for and several sets of different length rods also. Drop me a line.
Neal
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