timing chain ? - Team Camaro Tech
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post #1 of 5 (permalink) Old May 6th, 04, 03:33 AM Thread Starter
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I have heard,that if you get ypur blocj align bored,that you have to get a diff size timing chain.True?

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post #2 of 5 (permalink) Old May 6th, 04, 06:56 AM
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Normal machining for 'Align-boring' removes @.005" of material from the top of the Crank bore moving the Crank and Cam @.005" closer together on their Center-lines.
Cloyes, and many of the other manufactures, offer special sets for these applications.
If you order the Cloyes "True-Roller" type for a SBC (#220-9-3100) just add .005 to the part number (#220-9-3100.005) and you will get the special set necessary.
I take it from your 'Sig' you are asking for a SBC but, same goes for their BBC sets.

Hope this helps;

John

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post #3 of 5 (permalink) Old May 6th, 04, 07:16 AM
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Quote:
Originally posted by Vintage 68:
Normal machining for 'Align-boring' removes @.005" of material from the top of the Crank bore moving the Crank and Cam @.005" closer together on their Center-lines.
Cloyes, and many of the other manufactures, offer special sets for these applications.
If you order the Cloyes "True-Roller" type for a SBC (#220-9-3100) just add .005 to the part number (#220-9-3100.005) and you will get the special set necessary.
I take it from your 'Sig' you are asking for a SBC but, same goes for their BBC sets.

Hope this helps;

John
If we line bore we really don't changing the centerline most of your material should be coming out of the cap not the block if done right.

But if we line hone and cut the caps .005 in theory you are only moving the center line .0025 and rarely have to go to a .005 under chain but we keep one on the shelve just in case.
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post #4 of 5 (permalink) Old May 6th, 04, 07:30 AM
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You are right - 'IF done correctly' [img]graemlins/hurray.gif[/img]

I very rarely run into a .005 set being needed either if just the caps were being cut and the block Honed - but, the manufactures wouldn't make a special set if they weren't needed from time to time...
The last BB I did required a .005 set after machine work to install new caps, quess it depends on how straight the block was before the work began.

His question was 'do you have to get a diff size timing chain' with 'Boring' and I should have answered "Maybe" with the info I provided instead of just the info.

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post #5 of 5 (permalink) Old May 7th, 04, 12:27 AM Thread Starter
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Hey thanks guys,I'll make sure And ask the machine guy the right questions,b4 I buy the timing set.

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