Questions on lifter bore correction

Mike Taylor 3601 · 02-02-2016, 11:12 AM

$ amount sounds about right.
I have done BBC and SBC,using BHJ fixtures, didn't have mopar fixtures,BBC and SBC you would really be surprised most of the time how far out they are,first tried taking them to .875 and would have 1/3 to half that wouldn't clean up going from .842 to .875 so after a few times of that just went ahead and bored for bushings.
You can install fixture on block and check lifter bore location,with go-no go gauge.
you can also degree cam on every lobe and check for cam timing variances,if shows differences though are lifter bores or cam if off????, but will not show if correct angle and squareness to cam.
Usually lifter bores are corrected to where they were supposed to be from factory.
Have never done a Mopar or done A-B testing on lifter bores, however one time dynoed BBC a guy had had machined elsewhere and assembled himself,wanted dynoed because didn't run right, ended up completely re machining all of it,had to square deck up,rehone,redo lifter bores that had been done, went from .842 to .904 to correct them,rebalance rotating assembly, gained 50HP first pull when went back on dyno.
Mike Taylor 3601

02-02-2016, 11:12 AM	#1
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,374 Likes: 359 Liked 308 Times in 103 Posts	Re: Questions on lifter bore correction $ amount sounds about right. I have done BBC and SBC,using BHJ fixtures, didn't have mopar fixtures,BBC and SBC you would really be surprised most of the time how far out they are,first tried taking them to .875 and would have 1/3 to half that wouldn't clean up going from .842 to .875 so after a few times of that just went ahead and bored for bushings. You can install fixture on block and check lifter bore location,with go-no go gauge. you can also degree cam on every lobe and check for cam timing variances,if shows differences though are lifter bores or cam if off????, but will not show if correct angle and squareness to cam. Usually lifter bores are corrected to where they were supposed to be from factory. Have never done a Mopar or done A-B testing on lifter bores, however one time dynoed BBC a guy had had machined elsewhere and assembled himself,wanted dynoed because didn't run right, ended up completely re machining all of it,had to square deck up,rehone,redo lifter bores that had been done, went from .842 to .904 to correct them,rebalance rotating assembly, gained 50HP first pull when went back on dyno. Mike Taylor 3601