6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > GMC V6 and V12 Engines


GMC V6 and V12 Engines Engine repair and rebuilding

Reply
 
Thread Tools
  #11  
Old July 7th, 2017, 05:21 PM
HOTRODJOHN HOTRODJOHN is offline
-= Dues Paid =-
 
Join Date: Apr 2014
Location: Henderson, Nevada
Truck: 1964 GMC PICKUP, 1956 PONTIAC SAFARI, 1949 CADDY SEDANETTE
Age: 69
Posts: 159
Rep Power: 62
HOTRODJOHN is on a distinguished road
Default Re: Looking for a magnum manifold

Thanks, I will give him a call. John
Reply With Quote
  #12  
Old September 26th, 2017, 08:25 PM
Firepower Firepower is online now
Junior Member
 
Join Date: Apr 2017
Location: Flint, MI
Truck: I don't own one - YET!
Age: 51
Posts: 13
Rep Power: 8
Firepower is on a distinguished road
Default Re: Looking for a magnum manifold

Quote:
Originally Posted by bigblockv6 View Post
The cam is a custom grind specific for the larger cubic inch V6 engines with bigger heads. As far as difference the 478M was fully rebuilt with the cam and I used it to replace the 305E in my 68 pickup, it should have a considerable power increase over a stock 478M. If I can dig up the cam specs from my computer files I will send them to you.
Would you be willing to share the specs? I was planning to send mine to Delta, when I do my RD450 (532ci) inline. Much worse paired intakes and way undersquare. It'll be fun to see how they compare.

Did you happen to measure/degree it before the regrind?

Did you measure combustion chamber volume?

How about pin to top of piston?

Piston to deck of block?

I'm a big believer in squish, and it seems a lost opportunity with the dished pistons.

Thanks!
Reply With Quote
  #13  
Old September 27th, 2017, 01:13 AM
bigblockv6 bigblockv6 is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
Posts: 1,111
Rep Power: 309
bigblockv6 is on a distinguished road
Default Re: Looking for a magnum manifold

[QUOTE=Firepower;68036]Would you be willing to share the specs? I was planning to send mine to Delta, when I do my RD450 (532ci) inline. Much worse paired intakes and way undersquare. It'll be fun to see how they compare.

Did you happen to measure/degree it before the regrind?

Did you measure combustion chamber volume?

How about pin to top of piston?

Piston to deck of block?

I'm a big believer in squish, and it seems a lost opportunity with the dished pistons.

These questions that you're asking me were pretty much between the machine shop that did all the machine work on my engine and the custom cam grinder, I did assemble the short block though. Longer valve springs were used since the cam has considerably more lift. The valve springs actually are for a 390 Ford. Since the cam sets on the same centerline it's not necessary to degree it. I'll get the specs out this weekend along with the part number for the valve springs.
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Re: Intake Manifold Gaskets for Magnum vs. Non Magnum Archiver Previous Forum Posts 0 May 19th, 2010 04:12 AM
Intake Manifold Gaskets for Magnum vs. Non Magnum Archiver Previous Forum Posts 0 April 20th, 2010 03:46 AM
Re: Magnum manifold Archiver Previous Forum Posts 0 January 9th, 2008 10:31 AM
Re: Magnum manifold Archiver Previous Forum Posts 0 January 9th, 2008 06:09 AM
Re: Magnum manifold Archiver Previous Forum Posts 0 January 9th, 2008 01:44 AM


All times are GMT +1. The time now is 10:11 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 103|0
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.