OK to go .060 over on a 350 block? - Team Camaro Tech
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post #1 of 9 (permalink) Old Nov 19th, 05, 09:22 PM Thread Starter
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OK to go .060 over on a 350 block?

Hey guys/gals...I was able to score a March 69 -618 block for my 05A Z resto, but the block is at .030 already, and may need to go to .060. I am not planning on racing or nitrous, just a fun and stock DZ-spec replacement. The original "done blowed-up" 35 years ago. I know Wiseco makes a .040 and a .060 11:1 replacement piston, but is this safe to do? My educated guess is that this is OK, but not for racing, which I am not planning on. I'd like to keep the Z a 302 car, and with a date correct block, it does help the "correctness quotient." Thanks for your input. Happy Thanksgiving to all!!
Chuck D.

69 Z-28-Glacier Blue, X-77
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post #2 of 9 (permalink) Old Nov 20th, 05, 05:47 AM
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Re: OK to go .060 over on a 350 block?

If you have to have a date correct block you might look at sleeving the block.

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post #3 of 9 (permalink) Old Nov 20th, 05, 06:12 AM
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Re: OK to go .060 over on a 350 block?

Doug
Get the cylinders sonic tested before you start as we sonic test every block that comes in the door and we find very few that will go .060 over and be safe but check into the Diamond pistons as they offer 4.045 pistons as this maybe a better deal for you.

Just my opinion
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post #4 of 9 (permalink) Old Nov 20th, 05, 07:31 AM
 
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Re: OK to go .060 over on a 350 block?

Isnt a 618 block still going to be incorrect? With that build date wouldn't you need a 010?
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post #5 of 9 (permalink) Old Nov 20th, 05, 07:37 AM
 
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Question Re: OK to go .060 over on a 350 block?

Is .140" on the thrust side thick enough?

I forget?

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post #6 of 9 (permalink) Old Nov 20th, 05, 08:23 AM
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Re: OK to go .060 over on a 350 block?

We try to run at least .170 on the thrust at the finish size. On blocks we check we shoot for .190 on the thrust as it can be bored to .040 over and maintain the .170 that we go by.

On a stock application you might get away with .140 but a few years ago a block cam inthe shop with a cracked cylinder and check the thickness and found it to be only .135 and this engine was only about 475 horse.

When cylinders get that thin it hard for the rings to seal as the cylinders are flexing.

Just my opinion
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post #7 of 9 (permalink) Old Nov 20th, 05, 09:39 AM
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Re: OK to go .060 over on a 350 block?

Chuck is correct on this one. It all depends on the block you are building.

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post #8 of 9 (permalink) Old Nov 20th, 05, 12:59 PM Thread Starter
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Smile Re: OK to go .060 over on a 350 block?

Thanks Jonesy....McNeish's book shows the -618 block until late April, then -010 late April/early May. My original POP date is 4/17, so I can go either way, most likely. Anyway, it sounds like the .060 is not out of the question as long as the block has anough iron. I'll either get that checked, or go .045 and sleeve, or both. Looking for these old date correct blocks is a pain...tough to find one not already bored to useless dimensions. As I go, I will post my progress. Thanks to all.
Chuck D.

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post #9 of 9 (permalink) Old Nov 22nd, 05, 11:53 AM
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Re: OK to go .060 over on a 350 block?

Quote:
Originally Posted by ChuckD
Thanks Jonesy....McNeish's book shows the -618 block until late April, then -010 late April/early May. My original POP date is 4/17, so I can go either way, most likely. Anyway, it sounds like the .060 is not out of the question as long as the block has anough iron. I'll either get that checked, or go .045 and sleeve, or both. Looking for these old date correct blocks is a pain...tough to find one not already bored to useless dimensions. As I go, I will post my progress. Thanks to all.
Chuck D.
Chuck,

I just took the "618" block (not matching-numbers) out of my '69 Z because I broke a cam (and a rod... ) and I recently ordered a 550hp/383 stroker as a replacement.I stayed true to the sporting-ness of the car and had them built it 11 to 1 with all the best forged goodies inside.I found that my block already was sleeved in the number 1 cylinder and I too will probably re-build it as a stock 302 just to have it at the ready. I doubt it'll ever install it though after wailing away at this 383.

I know these are getting difficult to find...in usable condition anyway.

John

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