Information Needed on 1971 L48 350 sbc internal spec's - Hot Rod Forum : Hotrodders Bulletin Board -- Hot Rod Forum

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

LinkBack Thread Tools
  #1 (permalink)  
Old 06-16-2008, 10:08 PM
Registered User

Last journal entry: Inch each day is ok for
Last photo:
Join Date: Feb 2008
Location: Canada, Ontario
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Information Needed on 1971 L48 350 sbc internal spec's

I figured so far from the code (cgl) it is a 4 bolt main. I need to find out the rest, ie. cam specs and piston and rod type and crank (forged or cast). It is for a chevelle or nova or camaro or monte. And is rated at 270hp. Would like some help please.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 06-17-2008, 04:28 AM
F-BIRD'88's Avatar
Yada Yada Yada
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,201
Wiki Edits: 0

Thanks: 5
Thanked 386 Times in 380 Posts
Not much to know. This is a low perf motor. It is the base 350.
It may have a 4 bolt main block, but the heads are 76cc low compression smoggers with poor(er) ports, combustion chamber and 194"x 150" valves. Probabily early 882, or 441 or 336, 920 castings. cast dished pistons "929 cam" 194-202@.050" .390-.410" lift 112LSA. Low rise Qjet manifold and carb. 8.5:1 cr. First of the "low lead" engines. May or may not have factory hardened exhaust seats.
Most likely a cast crank.
This is essentually the 350-300hp 10:1 69-70 engine sans the good late camel back 186, 041,040,492 heads and pistons. (cr is lower to run on Low lead fuel) The start of the "smogger era".
The 270hp rating is not the same a how engines are rated today.
The heads are still the pre 1974 heavy casting design.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-19-2008, 10:59 PM
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 65
Posts: 5,103
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It's essentially the same thing as the current Goodwrench standard crate engine.
Reply With Quote Quick reply to this message

Recent Engine 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:


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.

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
Port or Full time vacuum cool rockin daddy Engine 129 10-05-2010 04:00 PM
Timing woes on SBC 350 with bigger cam. Brawler Engine 5 09-07-2007 05:33 PM
SBC Strokers - 350 vs 400 Blocks & Combos (not just 383 & 406) ez2cdave Engine 11 05-21-2007 10:34 PM
350 sbc build up help!!! dustinweaver Engine 2 07-31-2006 07:17 PM
l48 350 specs iluvdrt Engine 1 01-12-2004 07:18 PM

All times are GMT -6. The time now is 10:33 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright 1999 - 2012. All Rights Reserved.