70 455 motor

Old January 28th, 2019, 06:33 PM
  #1  
Registered User
Thread Starter
 
Join Date: Jun 2018
Posts: 20
70 455 motor

I have a rebuilt 70-455 motor..030 over with E heads.The machist took .100 tousandths out of the 10.5 to 1 pistons.The deck and heads have a clean up cut on them.Would anyone know what the compression would be roughly after the machining?
70-455 is offline  
Old January 29th, 2019, 12:01 AM
  #2  
Registered User
 
Join Date: Apr 2012
Location: Bradenton, FL
Posts: 1,105
I'm confused.....where did the machinist take .100" out of the pistons?
brownbomber77 is offline  
Old January 29th, 2019, 01:39 AM
  #3  
Registered User
Thread Starter
 
Join Date: Jun 2018
Posts: 20
Off the face.
70-455 is offline  
Old January 29th, 2019, 01:50 AM
  #4  
Registered User
 
shiftbyear's Avatar
 
Join Date: Nov 2015
Location: So. Ca.
Posts: 463
A few things you'll have to obtain to make a good calculation: Piston to deck height at TDC, Combustion chamber volume, head gasket thickness (crushed), any valve recess or dome in the piston, Although the factory advertised 10.5:1, that was blueprinted specs with a steel shim gasket. Good luck with your engine build.
shiftbyear is offline  
Old February 8th, 2019, 12:05 AM
  #5  
Registered User
 
Join Date: Apr 2012
Location: Bradenton, FL
Posts: 1,105
So the pistons are now .135" in the hole instead of .035" stock? What brand pistons are being used? I'm assuming with the information given, it's now a flat top piston?

4.155 bore
4.250 stroke
flat top pistons (now)
77cc combustion chamber
.038 compressed gasket thickness
.135 deck clearance

9.18:1 but 8.9:1 with 80cc combustion chamber which is probably more realistic
brownbomber77 is offline  
Old February 8th, 2019, 01:19 AM
  #6  
Registered User
Thread Starter
 
Join Date: Jun 2018
Posts: 20
G.m.

Speed pro pistons.
70-455 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Texas442
Big Blocks
13
March 1st, 2017 06:22 PM
BLACKCADDY
Parts Wanted
12
June 2nd, 2015 09:38 AM
OLZ442
442
15
October 24th, 2011 07:38 PM
dp442
Parts For Sale
0
February 15th, 2011 04:22 PM
ctrain22
Big Blocks
1
May 20th, 2009 11:02 PM


Thread Tools
Search this Thread
Quick Reply: 70 455 motor


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.