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pullin88 10-22-2009 17:53:50 69.176.232.191 125403 Report to Moderator	I have a 49 88 gas that I plan to build for pulling. I plan to use the 3.875 piston kit. I read alot about offset crank grinds, and I'm not really sure what that means. Any help would be great [Reply]   [No Email]
rick moore 10-23-2009 13:24:55 71.253.73.235 125433 Report to Moderator	Re: offset grinding a crank in reply to pullin88, 10-22-2009 17:53:50   absolutely you can weld an oliver crank... but you are correct if you use this method to stroke the crank you will need shorter pistons... ive heard of guys taking 265's to over 500 CI and seen what the crank on one of these looks like... its an ugly animal but will provide with plenty of fun...good luck   [Reply]   [No Email]
chucksoliver77 11-12-2009 19:20:16 75.97.66.227 126124 Report to Moderator	Re: offset grinding a crank in reply to rick moore, 10-23-2009 13:24:55   you can plane 1/8" off the top of the 3 7/8" pistons , when i built my 77 motor 34 years ago i planed 1/8" off the pistons and the held up good for bothe pulling and light field work. i also had the crank welded on offset ground to give it a1/4" stroke. i used a super 77 crank and rods for the extra strength. i run up to 4000 rpms when pulling with no problems, (knock wood). you can weld and offset grind the 88 crank and get good results.hope this will help, chuck   [Reply]   [No Email]
Dan J 10-22-2009 18:38:59 206.159.161.32 125407 Report to Moderator	Re: offset grinding a crank in reply to pullin88, 10-22-2009 17:53:50   88, As I understand offset grinding a crank, All of the grind is taken from the inside (or bottom with piston at TDC) of the rod journal. This strokes the crank 1/2 of whatever is taken off the crank. If you take 1/4" off and use smaller diameter rods you would end up with 1/8" stroke. Dan   [Reply]   [No Email]
Oliver Puller 10-23-2009 06:07:02 76.6.251.241 125419 Report to Moderator	Re: offset grinding a crank in reply to Dan J, 10-22-2009 18:38:59   Everything that you said is correct except the amount of stroke. If you offset grind 1/4" off a journal you gain an extra 1/8" of stroke at TDC and also 1/8" of stroke at BDC so you gain a total of 1/4". You can also have a crank welded up on one side and reground to add stroke. This way you can still use your old rods. The only problem is now you need shorter pistons. I am not sure if you can weld Oliver cranks as I have never done it but I help a guy with a John Deere 4010 that is welded and stroked and it makes about 600 hp.   [Reply]   [No Email]