we took .003 off deck to start to see high and low spots. it took .005 to clean up perfectly. then .080 cut off deck . it's off to the boring machine next. trying to go .020 over but, there is .017-.018 ring ridge taper on cylinders 1 and 6. the pic shows .015 over , with .005 left for honing. looks like too much "eyebrow" for me to leave at .020 . what would you do?

Try putting a straight edge ageist it and running a feeler gauge in there to guestimate how much needs to come out.

good luck

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85 d-100 HEI 2BBl
06 Toyota Corrola

0.005" is too much to remove by honing. Honing's purpose is to create the correct surface finish, not to size the bore. Typically you only remove ~0.001" with a hone. You'll have to rebore until you have a smooth cylinder, even if you need to sleeve the cylinder. Leaving the worn area could break the rings and/or piston lands, and will create a significant blowby leakage.

Ken

Why only bore it +.020"? Do you already have pistons and rings in that size? If these blocks were rare and you planned on driving the vehicle 2 million miles I might only bore it .020", but if you're after HP and are using stock replacement pistons go +.060" and you'll still be able to go +.080" on the next rebuild. If you were buying custom pistons I'd bore it +.100". The Wiesco pistons are +.045 and +.085".

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Joshua

I would bore at least 0.040". Most of these blocks can take 0.140" over, so 0.040" or 0.060" is nothing.

Lou

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Home of Slant6-powered fun machines since 1988

Wiseco also has .105 over. ALL of there pistons use the new metric ring packs which have a lot less drag. You can also get all the fancy coating on them.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

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i just was going over docs notes about cylinder wall thickness. are you sure you can go .105 over? pictures of .020 over left a eyebrow, so going to .030. ronnie

I have a motor that is 0.192" over, running 15s in my truck and towing my racecar to the track. It was sonic checked by the guy who built it... 0.105" over is cake.

Lou

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Home of Slant6-powered fun machines since 1988

power stroke side on crankshaft scratches/scores while undersize grinding. keep on grinding...