ZL-1 aluminum engine build - Chevelle Tech
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post #1 of 13 (permalink) Old Dec 13th, 19, 12:50 AM Thread Starter
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Bill
 
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ZL-1 aluminum engine build

I'm building a new ZL-1 from the new GM crate big block and have a question if anyone has done this. I need to know the position that the bypass valve goes in under the oil filter, if I'm NOT running a remote oil cooler. Should it go in A, B, or C....

Thanks

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post #2 of 13 (permalink) Old Dec 13th, 19, 2:22 AM
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Re: ZL-1 aluminum engine build

Quote:
Originally Posted by Bill Rose View Post
I'm building a new ZL-1 from the new GM crate big block and have a question if anyone has done this. I need to know the position that the bypass valve goes in under the oil filter, if I'm NOT running a remote oil cooler. Should it go in A, B, or C....

Thanks

Likely B.
Check out January 2020 Hot Rod Magazine page 76

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post #3 of 13 (permalink) Old Dec 13th, 19, 8:42 AM Thread Starter
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Re: ZL-1 aluminum engine build

Dan, I just realized that hole B is larger than A or C and the bypass valve doesn't fit that hole. So it has to be either A or C ......I'l check out the Hot Rod article. Thanks for the
idea.....Here's a pic of the bypass valve...



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post #4 of 13 (permalink) Old Dec 13th, 19, 10:12 AM
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Re: ZL-1 aluminum engine build

My guy John that was banned from here has a zl1 for one of his cars. He tapped and blocked his he said with 3/8 npt plug. Said with the expansive motor he didn't want anything going in the motor not filtered. My steel block l88 is that way too. He said it is very common to run no by pass. Just wondering what the rest of the motor is going to be here. Those are nice blocks but at 5000 plus i can't see it myself.

RH
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post #5 of 13 (permalink) Old Dec 13th, 19, 11:33 AM
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Re: ZL-1 aluminum engine build

I went through that same issue/confusion about ten years ago when putting my engine together. I don't remember the configuration that solved the question, but if you still have questions I can go out in the garage and pull the filter off and look into that area. The engine needs an oil change anyway.
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post #6 of 13 (permalink) Old Dec 13th, 19, 11:42 AM
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Re: ZL-1 aluminum engine build

Engines aren't my area of expertise but I have never used a bypass valve and the engines I have bought didn't either. I trust my builder.

You're going to keep clean oil and good filters in this engine, right? If yes, there's no need to bypass oil.

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post #7 of 13 (permalink) Old Dec 13th, 19, 1:13 PM
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Re: ZL-1 aluminum engine build

Quote:
Originally Posted by Bill Rose View Post
Dan, I just realized that hole B is larger than A or C and the bypass valve doesn't fit that hole. So it has to be either A or C ......I'l check out the Hot Rod article. Thanks for the
idea.....Here's a pic of the bypass valve...

Way back when it went in the side of the block above the filter. U have a new in box GM bypass somewhere.

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post #8 of 13 (permalink) Old Dec 14th, 19, 1:30 AM Thread Starter
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Re: ZL-1 aluminum engine build

Quote:
Originally Posted by 69ZL1 View Post
I went through that same issue/confusion about ten years ago when putting my engine together. I don't remember the configuration that solved the question, but if you still have questions I can go out in the garage and pull the filter off and look into that area. The engine needs an oil change anyway.
Thanks for the offer Mike. That was mighty nice of you, but I think I have my answer. The bypass goes in the C position. I'll probably block it off, but good to know the right place to put it.
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post #9 of 13 (permalink) Old Dec 14th, 19, 7:48 AM
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Re: ZL-1 aluminum engine build

Quote:
Originally Posted by Bill Rose View Post
Thanks for the offer Mike. That was mighty nice of you, but I think I have my answer. The bypass goes in the C position. I'll probably block it off, but good to know the right place to put it.
I don't know the answer, but I'm just glad to see that you're still around.

Looks like all is well if you're still building stuff.

You are missed.
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post #10 of 13 (permalink) Old Dec 14th, 19, 9:45 AM
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Re: ZL-1 aluminum engine build

I'm pretty sure that you take the threaded filter nipple out and it goes up there. The other one goes in hole B, I think. Hole B is for the cooler, if i remember correctly.

There was a thread on this subject about 5-6 years ago. You could email Mike Lewis (Wolfplace). He can straighten you out.

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post #11 of 13 (permalink) Old Dec 14th, 19, 11:47 AM
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Re: ZL-1 aluminum engine build

Is there a reason to run a bypass in a hotrod?

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post #12 of 13 (permalink) Old Dec 15th, 19, 1:13 AM
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Re: ZL-1 aluminum engine build

no, but you can't just leave it out. end up with no oil filter at all.

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post #13 of 13 (permalink) Old Dec 16th, 19, 10:16 AM
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Re: ZL-1 aluminum engine build

Tom that is why i said earlier that you tap it with 3/8 npt.
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