The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1960 - 1966 Chevrolet & GMC Pickups Message Board > projects and builds

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-18-2014, 12:15 PM   #126
TommyDuncan
Registered User
 
Join Date: Feb 2013
Location: Boulder City NV
Posts: 214
Re: 1966 GMC 305 V6 Service

Quote:
Originally Posted by awbrown View Post
rufton , what port do you have the vacuum on now ?? From what you are telling us it looks like it is on the ported vacuum , it should be on manifold vacuum .. all the vehicles I have had got much better milage on manifold vacuum than ported...
Anyone else have an opinion on this?
The Holley PDF says to connect it to ported. I tried both but I made so many changes at once that I haven't figured it out yet.
TommyDuncan is offline   Reply With Quote
Old 03-10-2014, 05:01 AM   #127
monolith
Zero Albedo
 
monolith's Avatar
 
Join Date: Mar 2009
Location: San Gabriel, California
Posts: 478
Re: 1966 GMC 305 V6 Service

Gorgeous write up!

Makes me want to drag my 64 out of the back 40 and see what the racket was all about and maybe try to do something about it.
__________________
Baz

"Deserve's got nothin' to do with it."

66 GMC 1500 wideside longbed 250 4spd "Project Rekker"http://67-72chevytrucks.com/vboard/s...d.php?t=467467
65 GMC 1Ton Panelhttp://67-72chevytrucks.com/vboard/s...32#post4794432
65 Chevy Panel (former U.S.Navy truck)
64 Chevy Suburban Carryall 4x4http://67-72chevytrucks.com/vboard/s...d.php?t=358348
64 GMC 1000 wideside longbed 305 4spdhttp://67-72chevytrucks.com/vboard/s....php?p=3600890(Rip- parts truck now)
68 Dodge Charger
monolith is offline   Reply With Quote
Old 11-04-2014, 09:42 PM   #128
Rufton
Registered User
 
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
Re: 1966 GMC 305 V6 Service

Thanks for the compliments.

I took the GMC 305E on an I-75 trip 3-4-14 and got 13.4 mpg and 14.1 mpg driving approx 70mph. Need to get her out more but I've been tied up.
Rufton is offline   Reply With Quote
Old 11-30-2014, 02:52 PM   #129
starrman30
Registered User
 
starrman30's Avatar
 
Join Date: Jun 2005
Location: Anchorage, Alaska
Posts: 10
Re: 1966 GMC 305 V6 Service

wow what tranny do you have? my 69 feels like its revving up to 5000 rpm when I hit 60MPH. I'm pretty sure they al came with the 4 speed granny low tranny, except the automatic version. I have never tried to hit 70 MPH
starrman30 is offline   Reply With Quote
Old 07-22-2015, 12:45 PM   #130
gmcbrandon
Registered User
 
Join Date: Aug 2013
Location: Greencastle, PA
Posts: 14
Re: 1966 GMC 305 V6 Service

Great thread with tons of information and detailed pics. I myself am rebuilding one of these and was wondering did you use as far as the rear main seal? I order felpro set from summit, seal bs40048 and its just a rope seal, curious if you were able to find a two piece rubber or you settled with the rope seal? Thanks alot
gmcbrandon is offline   Reply With Quote
Old 10-22-2015, 09:28 PM   #131
BigDan3131
Registered User
 
BigDan3131's Avatar
 
Join Date: Jun 2006
Location: Maple Valley, WA
Posts: 1,909
Re: 1966 GMC 305 V6 Service

I know this is an old thread but now that you seem to be a master rebuilder of these engines have you thought about adding some performance upgrades to them? From the look of the heads they could handle much larger valves and do they really need 4 rings on the pistons? Knife edging the crank to make it lighter and blueprint the rods too. Not in the sense to make it rev higher but to increase performance at its regular rpm range. Has anyone stuck the massive 472 with its 5" bores in one of our trucks yet?

My 65 had the 305E behind the Powergilde, was there an adapter plate needed to mount the glide to the 305E? I know where one is...can it be used to bolt other autos to it?
__________________
Custom Painter/Restoration Specialist

1965 GMC 3/4 Ton LB
1964 Chevy El Camino 11.83 1/4 mile time in 1990
1991 Chevy S10 288K+ miles 2nd Owner
BigDan3131 is offline   Reply With Quote
Old 10-22-2015, 09:37 PM   #132
TJ's Chevy
Registered User
 
TJ's Chevy's Avatar
 
Join Date: Mar 2013
Location: Next to my bench at the shop, Oregon.
Posts: 10,198
Re: 1966 GMC 305 V6 Service

Quote:
Originally Posted by BigDan3131 View Post
I know this is an old thread but now that you seem to be a master rebuilder of these engines have you thought about adding some performance upgrades to them? From the look of the heads they could handle much larger valves and do they really need 4 rings on the pistons? Knife edging the crank to make it lighter and blueprint the rods too. Not in the sense to make it rev higher but to increase performance at its regular rpm range. Has anyone stuck the massive 472 with its 5" bores in one of our trucks yet?

My 65 had the 305E behind the Powergilde, was there an adapter plate needed to mount the glide to the 305E? I know where one is...can it be used to bolt other autos to it?
Guy stuck a 478 in a 68 Chevy so I know its possible. Also a guy took a 478 and put hemi pistons and rods in it. Had a custom cam ground. Catapiller diesel valves were installed in the head. Needless to say it KILLED anything near its cubic inch. Had a WAY better cool factor than a BBC. lol Guy who owned it said it would do 6K. I installed a 4 barrel on my 305. Did a 4 down to 2 adapter. Worked out really nice. Plan to install flat top pistons, shaved 351M heads and have the intake machined to directly fit a 4 barrel. Might have a little more duration added to the cam.
https://www.youtube.com/watch?v=mdZlZlWRRMI
__________________
"6 in a row makes it go!"
"I prefer a buzzin half-dozen"
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw
TJ's Chevy is offline   Reply With Quote
Old 09-30-2018, 12:01 PM   #133
Matt's k5
BLAZER THIRTY!!
 
Matt's k5's Avatar
 
Join Date: May 2007
Location: Utah
Posts: 244
Re: 1966 GMC 305 V6 Service

Quote:
Originally Posted by Rufton View Post
Converted clutch to diaphragm a few years ago and like it.
question for you, did this kit work great? no modifications of the disc? I'm looking for a clutch for my 62 with the 305 I found for sale on ebay nu551 and wanted to verify before purchasing thanks
__________________
49 chevy 5 window 20 year project
57 ford fairlane (dad's car never got to it before he passed away R.I.P I LOVE YOU DAD.)
62 gmc 305 v6 custom
72 k5 highlander blazer 2nd owner

71 K5 MAMMA'S RIDE!
63 GMC 4X4 305 V6
Matt's k5 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -4. The time now is 05:16 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com