Cam assessment - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 08-10-2018, 05:09 PM Thread Starter
 
1970PA4lifelemans's Avatar
 
Join Date: Aug 2018
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Cam assessment

After failing to identify the cam in my engine that I know nothing about except it's seems to be in near New condition inside. I decided to try to get some information using dial calipers masking tape and a calculator this is what I came up with. .465 exhaust lift, .435 intake, with roughly 110 degrees of separation. The engine is a 400 with 62 heads. Bottom end is stock. Haven't personally cced the heads yet but using the online figure of 75cc comes to 9.6:1 question is does this cam sound like a good performance cam selection or should I shop for something different? Not trying to dump a pile of money into it. Be pretty happy with 350hp to start with.
1970PA4lifelemans is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 08-10-2018, 05:25 PM
 
PontiacJim's Avatar
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,454
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 347 Post(s)
Garage
Quote:
Originally Posted by 1970PA4lifelemans View Post
After failing to identify the cam in my engine that I know nothing about except it's seems to be in near New condition inside. I decided to try to get some information using dial calipers masking tape and a calculator this is what I came up with. .465 exhaust lift, .435 intake, with roughly 110 degrees of separation. The engine is a 400 with 62 heads. Bottom end is stock. Haven't personally cced the heads yet but using the online figure of 75cc comes to 9.6:1 question is does this cam sound like a good performance cam selection or should I shop for something different? Not trying to dump a pile of money into it. Be pretty happy with 350hp to start with.
Should be an OK cam. The 110 LSA tends to build cylinder pressure, so you may have 9.6 static, but you will raise your dynamic compression with that cam. Guess you will be using a 93 octane or better and/or an octane booster, so the cam should work. Assume the duration is probably in the 280ish range? The 110 LSA is a strong pulling cam, but power will fall off quickly once it peaks. Should be good with a stock engine and high octane gas.
PontiacJim is offline  
post #3 of 5 (permalink) Old 08-10-2018, 05:39 PM Thread Starter
 
1970PA4lifelemans's Avatar
 
Join Date: Aug 2018
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
I can't figure any good way to check duration. Wrapped masking tape around the bearing marked it at the overlap. Divided 5.915 in circumference by 36 10 degree increments. Was roughly 110. Now I just need to inspect my crank bearings, reassemble. Thanks for your time.
1970PA4lifelemans is offline  
 
post #4 of 5 (permalink) Old 08-10-2018, 06:36 PM
 
Join Date: Jul 2016
Location: North Louisiana
Posts: 524
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
This CC Dual Energy cam has specs closest that I can find, to those you posted.

https://www.summitracing.com/parts/cca-51-207-4

The Voodoo 250 is not too far off, but has a 112 LSA.

http://www.lunatipower.com/Product.aspx?id=1773&gid=287
bigD is offline  
post #5 of 5 (permalink) Old 10-10-2018, 01:41 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,457
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 98 Post(s)
Years ago I ran a Sig Erson HI Flow 2 cam with similar specs....had a 108 lobe center. In a 389 with stock compression, a 4 speed, and 3.55 gears, it worked very well. It would not have been as happy with less gear out back and an automatic trans with a stock converter, though. Mine was .469 lift for both exhaust and intake....a single pattern design.
geeteeohguy is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
to cam or not to cam Mayhem5417 Service, Maintenance and Technical Discussion 12 09-26-2018 03:20 PM
LS1 stock cam VS LS2 stock cam Ehrgeiz X 2004-2006 GTO General Discussion 5 02-14-2014 05:20 AM
need help! cam or no cam! blackbeast Engine Discussions 4 02-17-2013 09:23 PM
Cam Chose ms4 vs livernois strage 2r cam GTOMOE9 Engine Discussions 7 03-08-2011 10:20 PM
Silly "Cam" Covers tparker 2004-2006 GTO General Discussion 5 10-11-2004 11:15 AM

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

 
For the best viewing experience please update your browser to Google Chrome