70 L89 engine - Page 3

**SS427** · #21 10-26-2021, 12:07 AM

Perfect Charley. Interesting that they were not using flanged exhaust bolts.

Lee Stewart · #22 10-26-2021, 02:47 PM

Rick:

Isn't it SOP to have a washer under the bolt for aluminum engine parts to prevent galling when tightened?

**SS427** · #23 10-26-2021, 03:21 PM

Quote:

Originally Posted by Lee Stewart

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.

x33rs · #24 10-26-2021, 03:35 PM

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.

Lee Stewart · #25 10-26-2021, 03:38 PM

Rick: when did Chevrolet stop this method of attaching the exhaust headers to the heads?

**SS427** · #26 10-26-2021, 03:48 PM

Quote:

Originally Posted by x33rs

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.

**SS427** · #27 10-26-2021, 03:53 PM

Quote:

Originally Posted by Lee Stewart

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?

**MosportGreen66** · #28 10-28-2021, 01:47 PM

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

**SS427** · #29 10-28-2021, 02:12 PM

Quote:

Originally Posted by MosportGreen66

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.

The Following User Says Thank You to Lee Stewart For This Useful Post:
SS427 (10-26-2021)

The Following User Says Thank You to SS427 For This Useful Post:
Lee Stewart (10-26-2021)

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