Help identifying these pistons if possible - Chevelle Tech
Engine General Engine Discussion.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 18 (permalink) Old Jul 19th, 19, 3:14 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
Help identifying these pistons if possible

I just bought an engine for my restoration project 65 SS, and I was hoping someone may be able to shed some light on what these pistons that are in the engine are, thanks.
Attached Thumbnails
Click image for larger version

Name:	E64320BB-1A95-4B47-8D1E-605BF8807CBD_1563563667915.jpg
Views:	60
Size:	64.8 KB
ID:	598678  
Dan1965 is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old Jul 19th, 19, 3:16 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
I suppose it may help to tell people what the engine is. It is a 454 standard bore Mark IV
Dan1965 is offline  
post #3 of 18 (permalink) Old Jul 19th, 19, 3:48 PM
Lifetime Premium Member
& Administrator
 
Join Date: Apr 2005
Posts: 16,714
Re: Help identifying these pistons if possible

Looks like a 71 w/Sp. H/Per. (454) standard bore
Is there any code on the front stamp pad?
Mike is offline  
 
post #4 of 18 (permalink) Old Jul 19th, 19, 4:31 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
On the block you mean Mike? If so the block casting # is 14015445. I’m trying to figure out what the compression ratio may be with those pistons. The heads appear to be nice heads too their casting # is 14096188. I got a great deal on this engine which I had no plans to buy yet as I am just starting the restoration and had no engine or trans with the car when I bought it.
Dan1965 is offline  
post #5 of 18 (permalink) Old Jul 19th, 19, 4:36 PM
Lifetime Premium Member
& Administrator
 
Join Date: Apr 2005
Posts: 16,714
Re: Help identifying these pistons if possible

Check the B or C location on the block as shown for the engine ID.


Also - https://www.chevelles.com/forums/34-...ston-help.html
Attached Thumbnails
Click image for larger version

Name:	EngineID_600x400.jpg
Views:	16
Size:	36.4 KB
ID:	598690  
Mike is offline  
post #6 of 18 (permalink) Old Jul 19th, 19, 4:40 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
This is what info I have.
14015445...454.......78-90...2 or 4 bolt
And I have pulled the pan and it is a 4 bolt main block, here are the heads that are on it as well
14096188...70-71...rect...OPEN...454 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber
I believe that 116cc chamber size is incorrect, I believe they are 118cc chambers
Dan1965 is offline  
post #7 of 18 (permalink) Old Jul 19th, 19, 4:44 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
Ok I’ll check those B and C locations for the ID #, I won’t be back to it until the beginning of the week. That stamping # on the top of the piston 6262975, is there any way of identifying the pistons with that #?
Dan1965 is offline  
post #8 of 18 (permalink) Old Jul 19th, 19, 4:49 PM
Lifetime Premium Member
& Administrator
 
Join Date: Apr 2005
Posts: 16,714
Re: Help identifying these pistons if possible

Actual part # is 6262976 if you care to look them up.

I added some info to my previous post so incase you missed the link - https://www.chevelles.com/forums/34-...ston-help.html
Mike is offline  
post #9 of 18 (permalink) Old Jul 19th, 19, 5:04 PM
Senior Tech Team
 
Join Date: Sep 2012
Location: New York City
Posts: 1,983
Re: Help identifying these pistons if possible

Mike, I zoomed in on the piston number. The last digit is most definitely a 5.

LS1tech.com supermoderator.
How may I help you?
1971 Monte Carlo SS454-496ci 600hp
1999 Trans Am-500hp
2003 Iszu Ascender XL Limited V8
paul bell is offline  
post #10 of 18 (permalink) Old Jul 19th, 19, 6:48 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
Yes it is Paul, this may be a better shot
Attached Thumbnails
Click image for larger version

Name:	319AEAB6-3657-4CE5-9DD2-5AD0E765D715_1563576517229.jpg
Views:	34
Size:	85.5 KB
ID:	598700  
Dan1965 is offline  
post #11 of 18 (permalink) Old Jul 19th, 19, 6:55 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
Thanks for the info guys, I’m really going to like this forum, I can see that already
Dan1965 is offline  
post #12 of 18 (permalink) Old Jul 19th, 19, 7:23 PM
Tech Team
 
Join Date: Aug 2005
Location: KY
Posts: 919
Re: Help identifying these pistons if possible

Quote:
Originally Posted by Mike View Post
Looks like a 71 w/Sp. H/Per. (454) standard bore
Is there any code on the front stamp pad?
That is what the pistons are. GM rated the 71 LS6 at 425 hp with the 074 heads. They had app. 118 cc. and the compression ratio was 9 to 1. The 188 will have a couple more cc. I would think your compression will be in the 8.6 -8.8 range.
sleeper is online now  
post #13 of 18 (permalink) Old Jul 19th, 19, 8:46 PM
Senior Tech Team
 
Join Date: Sep 2012
Location: New York City
Posts: 1,983
Re: Help identifying these pistons if possible

I believe the number Mike posted is for a LS6 piston.

Before Tonawanda went to the Gen5 engine, boring and honing big blocks rarely produced the bores they needed and they had pistons + or - for every bore size. I'm thinking this 6262975 stamped piston may be a slight size variant of the listed piston with the 6262976 part number.

LS1tech.com supermoderator.
How may I help you?
1971 Monte Carlo SS454-496ci 600hp
1999 Trans Am-500hp
2003 Iszu Ascender XL Limited V8
paul bell is offline  
post #14 of 18 (permalink) Old Jul 19th, 19, 10:05 PM
Senior Tech Team
Jon N.
 
Join Date: Jan 2003
Location: back in the "Hew-Hess-Hay"
Posts: 3,995
Re: Help identifying these pistons if possible

Much the same as casting numbers on blocks, heads and such aren't the part number that they are sold under by a manufacturer or dealer, pistons and camshaft numbers often are not sold under the numbers cast or stamped into them.

Some times they are only one digit apart, sometimes the complete number is different.

Jon N.

The only reason someone would want insurance is if they want to pay someone elses bills or want someone else to pay their bills.

BIGOT is a word used by people that can't use logical reasoning to prove that you are wrong when you don't agree with them.
dyno jonn is online now  
post #15 of 18 (permalink) Old Jul 23rd, 19, 9:40 PM Thread Starter
 
Join Date: Jul 2019
Posts: 28
Mike here is the ID number from the block C576159
Dan1965 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome