Go Back   The Supercar Registry > General Discussion > Member's Rides

Thread Tools Display Modes
Old 03-10-2023, 08:52 PM
napa68's Avatar
napa68 napa68 is offline
SCR Sponsor
Join Date: Oct 2008
Location: Presque Isle, WI
Posts: 2,946
Thanks: 3,227
Thanked 2,064 Times in 701 Posts

If the exhaust valve is not working (for whatever reason) that would contribute to the carbon fouled plugs. It would be easy to back off the #8 rocker arm (when the intake valve is staring to close) in order to see if the push rod is straight.

If it's bent, well that would be an easy fix. But, usually there is an underlying reason the push rod is bent. In my case (early years) it was due to missing 3rd gear

You could say I broke some parts while honing my craft
59 Bel Air LS3 Beater
68 Camaro SS L78 / L88
70 Corvette LS5 8900 miles
Reply With Quote
Old 03-10-2023, 08:57 PM
Too Many Projects's Avatar
Too Many Projects Too Many Projects is online now
Yenko Contributing Member
Join Date: Oct 2020
Location: Troy Township, WI
Posts: 3,172
Thanks: 1,652
Thanked 2,062 Times in 1,003 Posts

The exhaust valve not opening enough will cause a backfire thru the carb, as the cylinder IS getting gas and firing, but the burnt gas can't get out of the cylinder, so it will back up into the intake when that valve opens.
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
2000 FXSTS, original owner, 12k miles
Reply With Quote
Old 03-10-2023, 08:59 PM
JRC99's Avatar
JRC99 JRC99 is offline
Senior Member
Join Date: Jan 2015
Location: Michigan
Posts: 516
Thanks: 72
Thanked 112 Times in 49 Posts

The pushrod is definitely straight- I pulled it and looked at it.
My cars, passed down by my grandfather:

'68 Camaro SS (454/TH400, possible L78/M22) LeMans Blue, black deluxe interior, black vinyl top. 3.73- mostly Day 2.
'89 Mustang GT- 3.55, subframe connectors, muffler delete, and a couple other minor mods. Exactly as he wanted it, so how it shall stay

1995 Ford F-150 XL
2004 Dodge Ram Hemi GTX- #192 of 433

Ain't no fun in viewing your car as an 'investment'. Get out there and beat on it!
Reply With Quote

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. The time now is 01:13 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.