327 210 pistons? - Team Camaro Tech
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post #1 of 7 (permalink) Old Jun 17th, 14, 06:21 PM Thread Starter
Larry
 
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327 210 pistons?

Does anyone know what pistons and overall compression a 1968 327 210 HP has? Thanks for your time.
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post #2 of 7 (permalink) Old Jun 17th, 14, 06:46 PM
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Re: 327 210 pistons?

My Chilton's book says:

Top Compression 0.013-0.023
Bottom Compression 0.013-0.025

This is "Ring Gap"; not sure if that's what you need...
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post #3 of 7 (permalink) Old Jun 17th, 14, 06:56 PM
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Bill
 
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Re: 327 210 pistons?

The 210 horse engine has a flat top, cast aluminum, 4 valve relief piston, assuming they are original to the block. The 300 horse and 250 horse engines used the same piston. IIRC the 210 had a 9.5 to 1 compression ratio which was derived from a large combustion chamber in the cylinder head. The 300 horse had a different head with a smaller chamber size which yielded a 10.5 to 1 compression. I hope this helps.
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post #4 of 7 (permalink) Old Jun 17th, 14, 06:58 PM
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Brian
 
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Re: 327 210 pistons?

The pistons are just basic flat-tops. Compression ratio is 8.75:1, and compression is 160psi, depending on how you meant the question. Source for that is the Chassis Service Manual.

1967 RS driver with a 327/210... but now with an M20, HEI, AAW harness w/ halogens and relays, Dakota Digital, Moto-Lita, TMI interior, and a few other toys
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post #5 of 7 (permalink) Old Oct 27th, 14, 04:55 PM
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Mike Petrovich
 
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Re: 327 210 pistons?

This site indicates that the 67-68 327 pistons were impact extruded alloy aluminum (as opposed to cast alloy aluminum):

http://www.chevy-camaro.com/parts/ch...des-piston.htm

Not sure about that, this seems to indicate cast alloy aluminum:

http://www.camaros.org/l30m20.shtml

1968 327 sport coupe. Son of original owner.
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post #6 of 7 (permalink) Old Oct 29th, 14, 10:12 AM
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Re: 327 210 pistons?

Quote:
Originally Posted by mike p View Post
This site indicates that the 67-68 327 pistons were impact extruded alloy aluminum (as opposed to cast alloy aluminum):

http://www.chevy-camaro.com/parts/ch...des-piston.htm
That link brings up a "Forbidden" error page, but if it says impact-extruded (forged) pistons, it's wrong. The ONLY small-block Camaro with forged pistons was the Z/28. Period.

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post #7 of 7 (permalink) Old Oct 29th, 14, 11:27 AM
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Mike Petrovich
 
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Re: 327 210 pistons?

Thanks for the info JohnZ, I thought the IE 327 piston info might be incorrect.

I'm not sure what happened to that piston page, I was just on there a couple days ago.

It looks like the main site is still online:

http://www.chevy-camaro.com/

Maybe someone called them on the incorrect info, and they took the piston page down.

This site posts the same piston info (in a more primitive format):

http://www.holisticpage.com/camaro/parts/piston.htm

You can see they also listed some 396 and the 427 pistons as impact-extruded.

1968 327 sport coupe. Son of original owner.
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