Mystery holes in rear of block - Team Camaro Tech
Tech 2002 General Tech questions from 2002
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post #1 of 5 (permalink) Old Aug 14th, 02, 12:25 PM Thread Starter
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I am in the midst of putting in a new flywheel, etc and noticed two threaded holes that are about 1/8" on the top lip that the bell housing bolts to. There is one on each side, towards the outside edge, on top of that 'flange'. Being threaded, do they have a purpose? If I am explaining myself clearly, what are they for? I'd like to seal them so any oil leaks from the rear of the engine don't work their way inside the bellhousing.

Rick Dorion
69 RS Conv,355,M20,4.10's and I don't worry about stone chips ( yet ).
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post #2 of 5 (permalink) Old Aug 14th, 02, 01:00 PM
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They were used for plug wire loom brackets.

Don~ ZZ430DropTop
70 RS/Z28
67 RS/SS Convertible, 70 RS/Z28
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post #3 of 5 (permalink) Old Aug 22nd, 02, 06:18 AM
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The brackets were only used on engines with "ram's horn" style manifolds, but the holes were drilled/tapped in all blocks - they're 1/4"-20, and the larger hole just above them takes a locating tab on the loom bracket to keep it in position.

'69 Z28 Fathom Green

[This message has been edited by JohnZ (edited 08-22-2002).]
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post #4 of 5 (permalink) Old Aug 22nd, 02, 06:31 PM
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where can one purchase these Wire looms?
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post #5 of 5 (permalink) Old Aug 23rd, 02, 11:02 AM
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All the Corvette resto parts houses have them (Corvette Central, Zip, Long Island Corvette Supply, etc.); Corvettes had "ram's horn" manifolds and ignition shielding, so they used them - Novas, Camaros, and Chevelles have the "log" manifolds and didn't use them.

'69 Z28 Fathom Green
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