70 L89 engine
 

I am restoring a 70 L89 and am hoping someone can tell me what;
type of head bolt design was used
Type of exhaust manifold bolts were used (such as all washer head or no washers for example or were they like the cast iron heads)
Type of head bolt design on the intake

I know exactly what was used on a normal BB with aluminum intake but not sure on an L89 with aluminum heads. Since this is the only 70 L89 known to exist, if any of you 69 owners can share close up photos of your survivor or perfectly restored L89 cars bolts look like it would be much appreciated.
Rick

I wish I knew the answer….

Please tell us about this L89!!!

Ryan W31

Does Charley still have that 1969 L89 El Camino?

Contact Chris White....he will have great advice :)

Dan

You know the car well as it was in your L89 showcase. Now in the beginning stages of undergoing a complete and correct nut and bolt restoration.

Indeed he does but has a lot on his plate right now and is very busy so I try to not bother him.

Charlie has a really nice 69 L89 El Camino that I've seen a few times at the Pavs. Very nice guy too. If I'm not mistaken I think it's a low mile survivor? Haven't seen Charlie or the El Camino in over a year though with all the sillyness going on so my memory might be a little fuzzy.

----Heads, exhaust and intake have never been removed on the El Camino that I know of. It had some performance work done on it as the original owner was a marine hi perf engine builder, but none of the above were touched. It had a double pumper carb on it but the original carb came with it and I reinstalled it. I remember it also having a Mallory dizzy, but can't remember if I changed that back to the original or not....Bill S

Nice!

This is the car I was thinking about, but didn’t want to suggest it needs a restoration. :-)

Ryan W31

Though it was a nice restoration especially considering it was done in the previous restorers garage and he was not a professional. Unfortunately there were just too many reproduction parts, incorrect colors, pitting in the frame that was not body worked, etc and the new owner said he wanted it perfect so off we go.

The next level :-)

This specific car in my opinion is the pinnacle 1970 Chevelle. (That is my opinion only)

To find one with better options, history, documentation one would need a flux capacitor.

Ryan W31

When are we Not Busy??? Call Him!

Dan

I'll take a couple pics of the Elky engine in a while.......

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Thank you Charley. Chris mentioned something about there possibly being a washer under the head bolts and this confirms it. Do you have any photos of the exhaust and intake bolts? I believe the intake are the same as in all BB aluminum but was insure on the exhaust as normal BB bolts have a special thread and was not sure they used those on the aluminum heads as well. Thanks again.

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

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.

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.

https://i.postimg.cc/Wzd6cC2L/0.jpg

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

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.

Please don't quote me as I do not study the early cars but I think possibly 1966?

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.