Good News...It's here! Bad News.........

[StephenC]

The good news.........

My SPF roller #1696 has arrived at Dynamic Motors in Ross, Ohio. I'm headed down to take a look and hopefully bring it home in the next few weeks. Got a deposit on a SA 427 to be built sometime in the next few months. Going slow with this project due to the health care needs of my parents.

By the way, Dean and Ron at Dynamic have been GREAT to work with. Highly recommended!

Need help..................

This is a Pontiac question and I ask it here because I have found this forum to have the most knowledgable car people I found. If I'm outta line by asking a non-Cobra question, please advise and I'll try to find somewhere else to get some good advice. Thanks to all.

I got my 67 GTO back from the garage after an extensive engine rebuild. It's a 400 ci and we put Edelbrack RPM heads on it, a new cam (medium street), Edelbrock Torker II intake and a 750 Holley. Car ran great ....for 75 miles.

Performace started to decline, black liquid spraying out the exhaust, missing and backfiring. Really bad. Took it back to the garage, 6 of 8 plugs fouled and mechanic said defective carb. He changed plugs and installed a new carb. The car ran great... for 75 miles.

It has started all over again, black spray, missing, backfiring, etc. It's headed back to the garage on Monday. Anyone have any idea what might be causing the plugs to foul after 50 to 75 miles? I don't think "defective" carb is the real answer.

Again, thanks for any help.

[George Snyder]

Steve,

Register and post your question here under engine mods.

http://www.chevytalk.com/

Bud

[NeedAntiVenom]

Steve,

I used to have a 68 goat with a RAM AIR IV motor. One of my all time favorite rides. Once lit up the tires in 4th gear (meant to used 2nd) furious smoke until the tires heated up and grabbed. Toasted my brand new clutch in an instant.

I would look at the possibility of a leaky intake gasket allowing water to be drawn into the intake. Have you been losing any coolant? Check the oil also to see if any may have made it way into the pan. If it was that rich you would think it would run like crap all the time.

Best of luck and hope you get your roller soon,
Jim

[Jack21]

May or may not be THE Pontiac Guru of thegroup, but do hasve a lot of experience with them. (Might want to bounce this one off Mr. Fixit also)

Somehow, I don't think it's the carb either, but need more details. Plugs fouled, with fuel or oil? Black liquid out the exhaust, fuel or oil?

If fuel, if it were running that rich (like no jets at all in the primary metering block), if the motor would even start, I doubt you could get the car out of the driveway before you started having problems with it. A closed choke might give you similar symptoms, but a lot sooner than 50 - 75 miles. And the motor would run like crap.

Is the cam dialed in correctly? Is the ignition dialed in correctly?

I'm thinking oil, rather than fuel. And oil can only get into the combustion chamber in a few ways. Past the rings, past the valve stems. (Pontiacs are notorious for drinking oil down the valve stems when the seals let go) That's the obvious ones. Oil getting into the intake by some other means are less obvious.

I would put Pontiac engines in the same class as Ford FE's in that it's been 20 - 30 years since most machine shops have seen one, and they do have their quirks. (I could still build a Pontiac engine in my sleep, but would ask for a lot of advice with an FE)

H-O Racing Specialties in Hawthorne CA was where the real Pontiac Guru's resided, and they may still be around. Check for postage stamp size ads in Hot Rod, PHR, etc.

Why did you use a 400 instead of a 455? The blocks are identicalfrom the outside and you can't tell the difference unless you know Pontiac casting numbers. The Edelbrock P4B or Performer RPM will give you better street performance than the Torker.

This is a little off-topic for a Cobra site, although most of us came up through the Musclecar ranks. If you want to go off-line with this, I'm at jwalsh21@ix.netcom.com.