- Joined
- Jul 31, 2014
- Messages
- 371
- Reaction score
- 412
- Location
- Seattle
- My Car
- 71 conv,429cj, 4spd 3.5 N-case, it's not an original but the running gear is correct.
69 Fastback, it's a project.
I have a D0VE-A block w/460 crank, SCJ iron heads, performer rpm. It ran good, a little oil on the spark plug threads but didn't foul plugs. I took it apart to see what was in the engine and freshen it up. When I removed the intake, I noticed a sticky film of oil in all of the intake ports and about 1 to 2 inches into the intake manifold. The heads checked out good, I had the machinist install SS valves. The pistons and cylinder walls looked good, it was punched .030" over. The cylinders showed no taper or out of roundness. I flex honed the cylinders with 325 grit, installed Total Seal rings with gapless second. The cam that was in it was an engle. Hard to find specs for it but it looked to be 214/218 @ .050 with .500 lift, 110cl. I replaced it with a voodoo hyd flat tappet, 233/241 @ .050, .564/.582 lift, 110cl. Fired it up, broke in the cam, had a hard time trying to tune it, had a lot of fuel smell. Checked the plugs and found oil on the threads. Compression check showed 200-210 across the board and 3% leak down across the board. I drove it, had lots of power, much more than before I tore it apart. check the plugs again and a couple with oil on the insulators. Compression and leakage test showed no change. At this point, I thought the intake must be sucking oil from the valley. The Air fuel ratio looks good at 13.5 to 14, but the HC was crazy high, 4000ppm. I pulled the intake, it looked like it was sealing, but the intake ports were wet with oil. I reinstalled it, this time using silicone for end seals, and it seemed the same or maybe worse. I keep thinking it's the intake because the carb mixture screws don't respond the same from one side to the other, and if I goose the throttle from an idle, I hear a whistle sound from the air horn, all this leads me to think vacuum leak, but nothing detectable from the top side.
Not sure what to do next, the intake looks like it seals when inspecting the gaskets. My biggest worry is to tear the engine down and not find a problem.
Any suggestions???
Not sure what to do next, the intake looks like it seals when inspecting the gaskets. My biggest worry is to tear the engine down and not find a problem.
Any suggestions???