427 10.3:1 vs 408 11.5:1 - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

427 10.3:1 vs 408 11.5:1

Old 01-12-2019, 09:52 AM
  #1  
12 Second Club
Thread Starter
iTrader: (4)
 
Join Date: Sep 2005
Posts: 1,290
Default 427 10.3:1 vs 408 11.5:1

Same heads. NA and nitrous. Drag racing. Which one and why
fastlt1 is offline  
Old 01-12-2019, 11:06 AM
  #2  
"I MAID THEESE"
iTrader: (2)
 
Mavn's Avatar
 
Join Date: Jul 2011
Location: Houston
Posts: 1,323
Default

427 with 12:1
Mavn is online now  
Old 01-12-2019, 11:12 AM
  #3  
TECH Senior Member
iTrader: (2)
 
99 Black Bird T/A's Avatar
 
Join Date: Nov 2001
Posts: 5,893
Default

Originally Posted by fastlt1 View Post
Same heads. NA and nitrous. Drag racing. Which one and why
More cubes and more compression are good combination for NA drag racing. 427 and 12 to 1, sounds a good plan.
99 Black Bird T/A is online now  
Old 01-12-2019, 11:22 AM
  #4  
11 Second Club
iTrader: (1)
 
01CamaroSSTx's Avatar
 
Join Date: Feb 2015
Location: Texas
Posts: 646
Default

What heads and what fuel? But hands down the 427 with 12:1 will make more power N/A than the others.
01CamaroSSTx is offline  
Old 01-12-2019, 12:05 PM
  #5  
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: Conroe, TX
Posts: 8,193
Default

Originally Posted by fastlt1 View Post
Same heads. NA and nitrous. Drag racing. Which one and why
With limited details, I would probably go with the 427 and the lower compression. The 4.125 bore in the 427 would likely be able to fit a better head and the lower compression will be a little safer with a given shot of nitrous and fuel.
KCS is offline  
Old 01-12-2019, 12:56 PM
  #6  
10 Second Club
iTrader: (4)
 
Darth_V8r's Avatar
 
Join Date: Jul 2014
Location: My own internal universe
Posts: 6,536
Default

Either way take the cubic inches
Darth_V8r is offline  


Thread Tools
Search this Thread

About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 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.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: