68 FB Help

plug cable. Try [with insulated pliers] removing the s/p wires one at a time with the engine running to determine which cylinder isn't firing. You'll hear a noticeable difference with a good s/p cable, whereas there would be little difference when you pull the questionable cable. Hope this helps.... Pete [69 F/B 400/400]

MG, I seriously doubt the oil is coming from around the

MGross wrote: port. Without seeing it I'd guess the leak is from the valve cover. If a shop did the work for you, I'd take it back and have them deal with it. re: miss; sounds like an ignition problem, such as an intermittent spark plug cable. Try [with insulated pliers] removing the s/p wires one at a time with the engine running to determine which cylinder isn't firing. You'll hear a noticeable difference with a good s/p cable, whereas there would be little difference when you pull the questionable cable. Hope this helps.... Pete [69 F/B 400/400]

OK Long story here. I recently had some engine work done on my 1968 Firebird 400. While replacing the clutch I decided on having a new rear main seal installed. What started as a simple job became an almost complete rebuild. Here is the problem when the block was sent to the machine shop the cylinders showed an average of .007 wear. The machine shop recommended new pistons as well as a cylinder boring. Do to being overbudget at the time I had the cylinders hones instead and new rings installed. The cylinder heads had no valve work done other then new springs, and valve seats. The camshaft in the engine was replaced with a Summit 2801 with new lifters and pushrods. I also replaced the valve studs and locks with BB Chevy style in order to adjust the valve train for zero lash. My problem is this the #8 cylinder is leaking oil from the mating surface of the exhaust manifold. The engine also has a steady miss in it. Any ideas here? Also how do I fix it? I don't really want to tear the engine apart again.

Thanks.

Pull the head. Maybe that exhaust valve seat, on cyl-8 didn't set right or cracked on installation. GW

MGross wrote:

Geoff,

Thanks for the reply. I have thought about redoing the cylinder heads including hardened seats. However, I am concerned with problems that this could cause with the cylinders. With .007 wear will this increase blowback?

IDK. I've never heard of that. I can tell you that my Pontiac 400 engine is bored .040 over and the heads are totally stock and it runs normally. Not sure really what your concern is. GW

MGross wrote: