Notices

Bbc 454 gen 4 overhaul

Thread Tools
 
Old 11-08-2020 | 10:29 AM
  #51  
Thread Starter
Registered
 
Joined: Sep 2020
Posts: 216
Likes: 15
From: Kentucky
Default Build

Ok so back to measurements for head gasket

It shows between 30k and 31k
Baja 250es is offline  
Reply
Old 11-08-2020 | 10:36 AM
  #52  
Thread Starter
Registered
 
Joined: Sep 2020
Posts: 216
Likes: 15
From: Kentucky
Default Build


This is what I'm installing
Baja 250es is offline  
Reply
Old 11-08-2020 | 10:46 AM
  #53  
Registered
10 Year Member
 
Joined: Oct 2012
Posts: 2,239
Likes: 541
Default

Originally Posted by Baja 250es
Ok so back to measurements for head gasket

It shows between 30k and 31k
did you rock the piston back and forth and take an average?
underpsi68 is offline  
Reply
Old 11-08-2020 | 12:02 PM
  #54  
Thread Starter
Registered
 
Joined: Sep 2020
Posts: 216
Likes: 15
From: Kentucky
Default Build

Yes 30 - 34
Baja 250es is offline  
Reply
Old 11-08-2020 | 12:18 PM
  #55  
mcollinstn's Avatar
Platinum Member
20 Year Member
Platinum Member
 
Joined: Sep 2001
Posts: 5,769
Likes: 151
From: tn
Default

Cut .034 off the block (zero deck). Then run .036-.039 gaskets.
Yes, it will increase compression, but the added turbulence from the "squish" benefits you MORE in both WIN/WIN categories. Power production AND detonation prevention.

Then, do some bowl work on the heads to unshroud the valves and add a few cc's to the chambers. Don't cut the heads unless they arent straight/flat.

I can't tell what carb that is.
Since you're running an aftermarket distributor, figure out your electronic advance and lock out the mechanical advance.
What ignition box/amp are you gonna run?


mcollinstn is offline  
Reply
Old 11-08-2020 | 03:29 PM
  #56  
Thread Starter
Registered
 
Joined: Sep 2020
Posts: 216
Likes: 15
From: Kentucky
Default Build

So I couldn't run a smaller gasket with the way the block is now and ignition is just factory setup still
Baja 250es is offline  
Reply
Old 11-08-2020 | 03:56 PM
  #57  
Registered
5 Year Member
 
Joined: Mar 2020
Posts: 372
Likes: 183
From: East Tennesseee
Default

Originally Posted by Baja 250es
So I couldn't run a smaller gasket with the way the block is now and ignition is just factory setup still
I can't speak for the ignition. But Cometic makes gaskets in about any thickness down to .027". They are the best on the market bar none. Using thinner gasket achieves same as cutting the block.
Smitty275 is offline  
Reply
Old 11-08-2020 | 04:10 PM
  #58  
Thread Starter
Registered
 
Joined: Sep 2020
Posts: 216
Likes: 15
From: Kentucky
Default Build

Thank u smitty that's what I thought but wasn't positive
Baja 250es is offline  
Reply
Old 11-08-2020 | 04:50 PM
  #59  
Registered
5 Year Member
 
Joined: Mar 2020
Posts: 372
Likes: 183
From: East Tennesseee
Default

Only issue with the .027" gasket is your still going to be above recommended max "quench" distance of .045". Unless you're going for every last ounce of performance in a timed racing situation I doubt you'll ever be able to measure the difference it power.
Smitty275 is offline  
Reply
Old 11-08-2020 | 05:01 PM
  #60  
Thread Starter
Registered
 
Joined: Sep 2020
Posts: 216
Likes: 15
From: Kentucky
Default Build

I'm not at all I just want it to be right no issues all season
Baja 250es is offline  
Reply


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

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.