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 > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-25-2016, 07:59 PM   #1
project_sinister_c20
Registered User
 
Join Date: Dec 2015
Location: Grants Pass OR
Posts: 5
72 C20 402 big block backfiring

Well i have a 402 big block mainly stock, performer rpm intake,demon carb,header, dual exhaust and just swapped it from points to a streetfire hei and from a edelbrock to the demon 750.

from what the previous owner tells me its a stock cam but it doesn't sound stock, he also showed me pics of him going through the motor to freshen it up but i doubt his abilities after the rear end he "rebuilt" blew up on me.

any who ive been chasing my timing around and cant seem to get it right and could use some help.

Iv'e started from scratch on the timing going from 8* to 16* and still get backfire through the carb and it just falls on its face. the vacuum advance doesnt seem to right either because the total timing doesn't seem to want to drop below 40-45* at around 2800rpm.

any help will be greatly appreciated!
project_sinister_c20 is offline   Reply With Quote
Reply

Bookmarks

Tags
bbc distributor, bbc timing, hei, timing


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 07:23 AM.


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