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  #21  
Old 10-26-2021, 12:07 AM
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Perfect Charley. Interesting that they were not using flanged exhaust bolts.
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  #22  
Old 10-26-2021, 02:47 PM
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Rick:

Isn't it SOP to have a washer under the bolt for aluminum engine parts to prevent galling when tightened?
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  #23  
Old 10-26-2021, 03:21 PM
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Quote:
Originally Posted by Lee Stewart View Post
Rick:

Isn't it SOP to have a washer under the bolt for aluminum engine parts to prevent galling when tightened?
Exactly why I was asking.
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Old 10-26-2021, 03:35 PM
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That seems to vary sometimes. Not to steer off subject but when it comes to aluminum intakes, I think the BBC used washers under the bolts from originals I've seen, but some SBC aluminum intakes didn't.
I know the 69Z's did not use washers under the bolts on the intakes.

Doesn't really make a lot of sense but that's what I've observed. Different assembly plants I know, but bolts gulling up aluminum you would think would want washers as kind of a standard procedure across the board.
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Old 10-26-2021, 03:38 PM
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Rick: when did Chevrolet stop this method of attaching the exhaust headers to the heads?
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  #26  
Old 10-26-2021, 03:48 PM
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Quote:
Originally Posted by x33rs View Post
That seems to vary sometimes. Not to steer off subject but when it comes to aluminum intakes, I think the BBC used washers under the bolts from originals I've seen, but some SBC aluminum intakes didn't.
That is correct, the BB engines (at least in 69/70 used a washer headed bolt other than where the engine lift bracket was bolted to just like in Charley's photo.
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  #27  
Old 10-26-2021, 03:53 PM
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Originally Posted by Lee Stewart View Post


Rick: when did Chevrolet stop this method of attaching the exhaust headers to the heads?
Please don't quote me as I do not study the early cars but I think possibly 1966?
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  #28  
Old 10-28-2021, 01:47 PM
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Rick, do you know if washers under head bolts is also correct for L89 Corvettes? I don't recall if our car had them? I'll need to study up on the NCRS manual too

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  #29  
Old 10-28-2021, 02:12 PM
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Rick, do you know if washers under head bolts is also correct for L89 Corvettes? I don't recall if our car had them? I'll need to study up on the NCRS manual too

Dan
Based on the little research that I have done for this L89 I would say yes, they should have washers and would assume an L88 would as well.
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