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#1 |
Registered Member
Join Date: Nov 1998
Location: Houston, Tx.
Posts: 3,887
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![]() The 4.000" measurement that you are getting accross the top of the cylinder means that the block has not been previously overbored. This doesn't mean that there's not cylnider wear further down the bore where the rings scrape against the cylinder wall. If you check with your finger tips, you will probably feel a ridge at the top of the cylinder wall. That's from the wear created by the piston rings against the cylinder wall.
Generally speaking, a .030" over bore will make the cylinder bore smooth and true. The machinists that I know don't recommend boring more than that on the thin wall casting of the small block Ford engine. My dial caliper uses a regular scale for the first .100 past the inch scale. The dial portion measures additional thousanths of an inch. If I had a 4.0 on the regular scale and the dial read a 30 that would make a measurement of 4.030" which is what my original 289 block was bored when the rebuild was done. Your machinist will evaluate the block to make sure he has something good to work with. He will check the cylinder bores for enough to make a good true cylinder. He will also check for cracks and other problems before he does all that work. Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe Last edited by Rev; 01-06-2006 at 02:07 PM.. |
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#2 |
Registered Member
Join Date: Jun 2005
Location: LAS VEGAS, NEVADA
Posts: 84
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![]() Hi Rev
Thanks for your clear explaination on dial caliper readings. I understood it all. Now, what I'd like to do is get an inside micrometer so I can do the readings myself. The inside of my cylinders are very smooth, as far as any cracks I don't know about that ![]() Think I can locate 'em myself ![]() Rev you know in this world lots of people like to get-over on others who don't know too much about rebuilding an engine (ME) ![]() So I'd like to check the bore myself and see if the machine shop is trying to get over on me. What do you think ![]() Thanks Rev GOD bless and Happy New Yr. Schooner ![]() |
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