did the swap and with #2 in #1 hole, got .020. so crank is ok.

i don't have any micrometers, so using a dial caliper i measured the two pistons that are out of the block, bottom of skirt to top of piston, and top of pin bore to top of piston, and i am convinced the piston is ok. so i believe i need a replacement rod, which will hopefully measure .010 - .013 longer. then all piston heights would be within .003.

i will remove the remaining pistons, mark the head as described and match the chambers to the bore. good stuff.


thanks, andy.

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84 D100 /6 long rod 225
86 D100 /6 my sons w/offy intake/weber carb
2016 buick regal turbo

How the heck could those rods be off by that much - wow.

Lou

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Home of Slant6-powered fun machines since 1988

My guess... it's a slightly bent con rod. Likely out of an engine / cylinder that got water in a bore, and was started. ("Hydrauliced")
DD

Doc, if you may remember, the single rod you sent me a while back had a mismatched cap. i went through all mine and found the best fitting cap i had, the machine shop remachined it. the bearing to journal clearance was good, but maybe the machining was off. maybe bent, but either way i would consider it not usable. when i get another rod i will measure carefully before installing the piston.


have a great day, andy.

_________________
84 D100 /6 long rod 225
86 D100 /6 my sons w/offy intake/weber carb
2016 buick regal turbo

Yes... aggresive resizing of the "big end" can change the rod's C to C... but .010 is a lot.
DD

Oh, I thought those were new K1 rods. This is easier to stomach... knowing that these are used & reconditioned factory rods

Lou

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Home of Slant6-powered fun machines since 1988