Grandfather's 68 SS Camaro.

[JRC99]

Originally Posted by Too Many Projects

OK, assuming it isn't a flat lobe, are the plug wires on correctly ? Many people get #5 and 7 crossed when all the wires are off at the same time. On that line of thought, are the plug wires all good ? Old, cracked wires can transfer to another and cause a misfire also.

Wires are new, the noise is from the passenger side. Plus, like I said, the last rocker on #8 (I'm not sure which side is intake or exhaust but I know it's the number 8 cylinder) doesn't move much while it's running, and when I checked the lifter with the rocker off, the pop was consistent with that lobe. I did check the firing order, it's correct. Unfortunately, that pretty well narrows it down. Good thing the garage at Pappaw's has a furnace because this sounds like a winter project!

[dykstra]

Originally Posted by JRC99

Wires are new, the noise is from the passenger side. Plus, like I said, the last rocker on #8 (I'm not sure which side is intake or exhaust but I know it's the number 8 cylinder) doesn't move much while it's running, and when I checked the lifter with the rocker off, the pop was consistent with that lobe. I did check the firing order, it's correct. Unfortunately, that pretty well narrows it down. Good thing the garage at Pappaw's has a furnace because this sounds like a winter project!

Your intake rocker/valve will be by your intake port and your exhaust rocker/valve will be by your exhaust port. Hope this helps.

[JRC99]

Originally Posted by dykstra

Your intake rocker/valve will be by your intake port and your exhaust rocker/valve will be by your exhaust port. Hope this helps.

Ah, right! It's the exhaust valve on #8 then!

[Too Many Projects]

Originally Posted by Too Many Projects

Sounds like a cam lobe going flat, usually the exhaust letting the burned fuel back fire thru the carb. Pull the left cover and investigate.

Originally Posted by JRC99

Ah, right! It's the exhaust valve on #8 then!

And there you have it.
Winter projects are always fun, but expensive. Start putting away some funds now so you can just dig in and keep working on it.

[67since67]

Sticking valve stem??? A friend recently bought a 396 car that had been sitting a long time. It would intermittently idle rough and pop thru the carb. He gave it a dose of Sea Foam or some similar product and drove it. It smoothed out and now runs fine. Just a thought....

[napa68]

Originally Posted by 67since67

Sticking valve stem??? A friend recently bought a 396 car that had been sitting a long time. It would intermittently idle rough and pop thru the carb. He gave it a dose of Sea Foam or some similar product and drove it. It smoothed out and now runs fine. Just a thought....

I've had 2 cars with sticking exhaust valves in recent years. The clearance from guide to stem was just too tight especially when the motor got some solid heat in it. The first was the 427 in my Dad's car, the second was a customers 327. While wiping out a cam lobe is not rare, please don't short cut the process without making sure the rest of the valvetrain is up to snuff.

I know it's expensive and frustrating..........but so is doing it twice.

Tim