Piston ID? - Chevelle Tech
Performance Our High Performance area

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 8 (permalink) Old Oct 5th, 05, 2:18 AM Thread Starter
Tech Team
 
Join Date: Oct 2001
Location: Wasilla, AK USA
Posts: 775
Piston ID?

I just picked up another 454 short block. Going to put it on the stand tomorrow and pull the pan, see whats inside! Date coded 1973, Mortech site say casting numbers could be either 2 or four bolt mains. I do know the current bore is .030 over, has domed pistons in the bores and are stamped "7053P" on the piston tops............ring a bell as to brand with anyone? Curious.......................The price on this one was very good, FREEBEE It has been sitting in a dry garage for at least 12 years, oil still in the pan. Bores look to be in good shape, will be fun to see what the crank / rods and bearings look like. A friend has abandoned his hot rod dreams, and the engine has been reminding him for 12 years that he still aint building a car to go with it. At least now he can use the man door in the garage, engine has been sitting in front of it for 12 years!!!!!

Craig
69 Malibu BSE 454/TH400
Best pass 7/4/06
1.4882 60Ft
6.8929 1/8 ET
99.35 1/8 MPH
10.87 1/4 ET
121.69 1/4 MPH
Best 60' 1.46
ak69 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Oct 5th, 05, 2:25 AM
Banned
Anthony
 
Join Date: Sep 2004
Location: Citrus Heights, CA
Posts: 9,690
Re: Piston ID?

They are Speed Pro. I asked about the same piston number a while back and nobody could tell me anything about them. My neighbor has a motor with the same pistons, thats why I asked. Since it wasn`t my motor I did`nt continue looking for the answer. I hope you have better luck than I did.
sschevellefan is offline  
post #3 of 8 (permalink) Old Oct 5th, 05, 2:28 AM Thread Starter
Tech Team
 
Join Date: Oct 2001
Location: Wasilla, AK USA
Posts: 775
Re: Piston ID?

Just knowing that they are speed pro is a good start. Thanks for the info!

Craig
69 Malibu BSE 454/TH400
Best pass 7/4/06
1.4882 60Ft
6.8929 1/8 ET
99.35 1/8 MPH
10.87 1/4 ET
121.69 1/4 MPH
Best 60' 1.46
ak69 is offline  
post #4 of 8 (permalink) Old Oct 5th, 05, 3:41 AM Thread Starter
Tech Team
 
Join Date: Oct 2001
Location: Wasilla, AK USA
Posts: 775
Re: Piston ID?

Digging around in some books.............found this in my copy of "Max Performance CHEVY Rat Motors". Pistons listed as SP-7053P are forged, closed chamber type, dome at 30.6 CC's, P stands for pressed pins, and give 11.8 comp ratio with a 106 cc combustion chamber. Intersting stuff. My current 049 heads / chambers were milled to 112 cc's. 049's are open chamber heads and would allow the use of closed chamber pistons. Going from 9.5 comp to 11 comprression would open up alot more cam choices.............more interesting stuff! I have no info on weight of the SP's, could not be much more heavy than trw 2399's i am currently running. Roller cam and more compression..............here we go again!

Craig
69 Malibu BSE 454/TH400
Best pass 7/4/06
1.4882 60Ft
6.8929 1/8 ET
99.35 1/8 MPH
10.87 1/4 ET
121.69 1/4 MPH
Best 60' 1.46
ak69 is offline  
post #5 of 8 (permalink) Old Oct 5th, 05, 4:11 AM Thread Starter
Tech Team
 
Join Date: Oct 2001
Location: Wasilla, AK USA
Posts: 775
Re: Piston ID?

A little more digging around...............looks like TRW2349 are the same pistons as SP-7053's. Got to love the internet, God Bless Al Gore for inventing it! Summit sells them new for 50 bucks a pop.

Craig
69 Malibu BSE 454/TH400
Best pass 7/4/06
1.4882 60Ft
6.8929 1/8 ET
99.35 1/8 MPH
10.87 1/4 ET
121.69 1/4 MPH
Best 60' 1.46
ak69 is offline  
post #6 of 8 (permalink) Old Oct 5th, 05, 6:38 AM
Lifetime Premium Member
Darren
 
Join Date: Oct 2000
Location: Indianapolis IN
Posts: 2,988
Re: Piston ID?

Craig,

Got some more info for you about the 7053P (or L-2349F) pistons from a copied page of an old Speed Pro catalog.

They are duplicates of factory 1970 11:1 comp ratio LS-6 engine. (forged and closed chambers). They have the weight listed (without pin) as 658 grams.

Dome sizes are as follows;

Standard bore= .265" height (30.6cc)
.030" overbore= .221" height (29.4cc)
.060" overbore= .210" height (27.9cc)

These are the pistons I run with a set of 049 ovals. Nice durable piston but a little heavy.

Hope this helps.

Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems HP1000
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Mosier axles
30x12.5 ET Street Radial
525++ rwhp
http://www.chevelles.com/showroom/da...0930-00149.jpg
http://www.chevelles.com/showroom/da...m/Vic_Jr_1.JPG
71454Chevelle is offline  
post #7 of 8 (permalink) Old Oct 5th, 05, 2:17 PM Thread Starter
Tech Team
 
Join Date: Oct 2001
Location: Wasilla, AK USA
Posts: 775
Re: Piston ID?

Thanks Darren! Piston mystery solved. Forensic BBC detectives around the world would be impressed! Are your 049's chambers stock volume at 118/122 cc's?

The domes of the SP7053 in this block all look to be in good shape, very light carbon build up. They might be worth reusing. Going to pull the pan today and take a look at the crank and rods.

This short block also came with a T400 trans, it will make a nice core for a spare.

I even have the wife convinced that a "BIG TIME" racer like me needs extra engines and transmissions. What if I broke something in the second round of eliminations while trying to win a four dollar trophy?

Craig
69 Malibu BSE 454/TH400
Best pass 7/4/06
1.4882 60Ft
6.8929 1/8 ET
99.35 1/8 MPH
10.87 1/4 ET
121.69 1/4 MPH
Best 60' 1.46
ak69 is offline  
post #8 of 8 (permalink) Old Oct 5th, 05, 2:35 PM
Lifetime Premium Member
Darren
 
Join Date: Oct 2000
Location: Indianapolis IN
Posts: 2,988
Re: Piston ID?

Craig,

No, my 049's have been milled down abit to get the SCR up. Years ago when I had the motor rebuilt, I told the builder I wanted 9.5 cr. For some reason (I don't know why) the machine shop milled a few CC's off the dome of the pistons.

Didn't find out until just a couple of years ago when I was changing cams and freshening up the heads.

I took about .040" off the deck surface of the heads to get them down to 113cc. The dome on the pistons are about 22cc. This figures out to be right at 10.0 scr.

Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems HP1000
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Mosier axles
30x12.5 ET Street Radial
525++ rwhp
http://www.chevelles.com/showroom/da...0930-00149.jpg
http://www.chevelles.com/showroom/da...m/Vic_Jr_1.JPG
71454Chevelle is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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



Similar Threads
Thread Thread Starter Forum Replies Last Post
4 Piston vs. 1 Piston Calipers Rowdy Brakes, Suspension & Steering 3 Jun 14th, 05 9:59 AM
Top piston ring is kinda tight in the piston cody Performance 7 Apr 11th, 05 2:14 AM
Wolfplace,BillK 454 Piston too tight? William Hennke Engine 2 Mar 30th, 05 7:56 PM
how to measure deck height?? RIPPERS 67 Engine 8 Aug 18th, 04 11:02 PM
Need help measuring piston to deck clearance blumont Engine 28 Oct 19th, 03 1:53 AM

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