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 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-31-2005, 02:57 PM   #1
farside847
Registered User
 
farside847's Avatar
 
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
Under-Gapped

Pulled a few spark plugs to take a look and was a little surprised that they
were not gapped correctly. They were set to .30 when the manual says they
should be .35 - what would this have done to my performance/mpg? Other
than that they looked pretty good...
Attached Images
 
__________________
1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

Last edited by farside847; 10-31-2005 at 02:57 PM.
farside847 is offline   Reply With Quote
Old 10-31-2005, 03:43 PM   #2
70rs/ss
Registered User
 
70rs/ss's Avatar
 
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
Re: Under-Gapped

It may have hurt the power and MPG because with a small spark there might not have been adequate ignition and flame travel. Gapping them to .35 will help, and if you have an hei I'd go to .40 or .45. The wider the gap, provided you have the spark energy, the better the ignition of the fuel and more power as well as an increase in MPG.
70rs/ss is offline   Reply With Quote
Reply

Bookmarks


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 01:24 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com