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#291
03-10-2023, 08:52 PM
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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 
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#292
03-10-2023, 08:57 PM
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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.
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Mitch 1970 Chevelle SS 1966 Chevelle SS 1967 Camaro ss/rs 2000 FXSTS, original owner, 12k miles
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#293
03-10-2023, 08:59 PM
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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 Also: 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!
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