383 hp/tq - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans Advertise
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics
User Name
lost password?   |   register now

LinkBack Thread Tools
  #16 (permalink)  
Old 11-30-2018, 09:40 AM
Registered User
Join Date: Nov 2012
Age: 34
Posts: 282
Wiki Edits: 0

Thanks: 7
Thanked 3 Times in 3 Posts
Originally Posted by ericnova72 View Post
You won't ever notice detonation on a engine run-in, there is no load on the engine.....for detonation to occur requires a load trying to slow the engine's acceleration.

At 10.3:1 comp, you probably better have at least 91 in the tank if you are going to use WOT at all.

It'll probably run on 87 in cool weather, and will if you never put your foot down hard.....so you could get home from a long drive on it just as long as you keep you foot off the floor while you've got the 87 in it.
I used 87 cause that's what I had at the house at the time. I will definatly run this motor at Wot after I break it in. This is strictly a play toy for me so if i need 93 I'll run it. This motor wont be ran everyday so it wont hurt the wallet.

Reply With Quote Quick reply to this message
Sponsored Links
  #17 (permalink)  
Old 12-31-2018, 05:28 PM
Registered User
Join Date: Nov 2012
Age: 34
Posts: 282
Wiki Edits: 0

Thanks: 7
Thanked 3 Times in 3 Posts
If I changed my .015 steel head gasket to the stock fel pro .039 compressed gasket it would change my CR from 10.3 to 9.77. Would I be able to feel the difference in that. How much hp/tq would I loose.
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 12-31-2018, 07:57 PM
ericnova72's Avatar
More for Less Racer
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 53
Posts: 18,762
Wiki Edits: 0

Thanks: 305
Thanked 3,648 Times in 3,036 Posts
Bad idea...even though you lower the compression ratio, you absolutely murder good quench, with the result being the thicker head gasket, 9.7:1 combination being even more octane sensitive and prone to detonation.

Sounds wrong to your brain cause you have lowered compression, but it has been proven many times that good quench outweighs the compression ratio change.

The only safe ways for you to lower compression are to grind the head chamber to a larger cc volume, or change to a dish piston.....never try to do it with a thick head gasket.
Reply With Quote Quick reply to this message

Recent Hotrodding Basics posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
My new Afr headed 383... Hp/tq numbers anyone? swp1983 Hotrodding Basics 11 12-27-2013 07:52 PM
383 finally finished! Compression,HP,TQ estimates??? ntx_gearhead Hotrodding Basics 7 04-28-2011 09:54 PM
383 vortec how much hp tq 383silverado Engine 17 05-19-2007 05:50 PM
engine hp and tq? tonylsg Engine 5 01-12-2003 06:24 AM
How much HP and TQ can I expect from this: stfinney Engine 8 11-13-2002 08:50 AM

All times are GMT -6. The time now is 04:19 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.