head recommendations
 

So, it's always time or money, LOL. So, with the Covod 19 situation I've found myself with spare time. yea! Working on the 911. It suffered a fire awhile back and even though I got it out the firemen hit it with stuff while I wasn't looking and now I've got no compression on that side.

I've pulled the heads, and the pistons and cylinders look great (pretty fresh rebuild) but the heads and valves are sketchy.

it's a 2.7 Solex cams, PMO carbs, pretty standard stuff.

I'm in CT, and would love to hear some recommendations. Local would be best, but since I'm not working, I'd like to keep the boutique shop pricing under control.

It looks like it's a simple clean up so they seat and seal right, maybe some new valves.

Thoughts?

Did the timing chain slip on the side with no compression? Odd that you would lose compression on one entire side and logic would imply that your valves are open when your crank pulley is in the position where they should be closed.

well, I should word things better. It has some compression on the left, but it's well short of what it should have. Like 50 lbs (less or more, depending on the cylinder. And they don't hold, it leaks down quickly. The engine was running fine and was shut down as the fire burst up. I feel strongly that the issue is corrosion and chemical damage to the valves and seats. The pistons look 100% normal...not valve mark telltales, and the honing marks are still visible on the cylinders.

I found this for you on the Koorsen Fire & Safety site published 1/21/20. Not sure what type of chemical was used to put out your fire, but this may help explain it if the compound entered your intakes:

Cleaning Up Dry Chemical Fire Extinguisher Residue

Dry chemical fire extinguishers work with a pressurized spray of a dry chemical that will blanket a fire and extinguish it. The most common agents used in dry chemical fire extinguishers are monoammonium phosphate and sodium or potassium bicarbonate. Time is of the essence when this type of extinguisher is used because these powders can be corrosive to metals and can lead to further damage if not cleaned up quickly.

I hope this can be easily fixed with a valve seat grind and fresh valves.

Perhaps posting some pictures of the heads will help.

Are you able to disassemble the heads, ie remove the valves?

FWIW, I just spent the bucks to get a Halotron extinguisher for my car. Dry chemical, OMG.

Thanks for the heads up on the chemicals....yea, it's a sad tale (aren't they all!)...It was middle of january of a very snowy winter, and I had finally dug my way to the 911 to start it and get it in the shop to do some winter maintenance, like suspension tuning fuel line replacement etc. It was running and warming as I moved other cars...and POOF, it went up, long story short, I grabbed the extinguisher in the mount on the back floor of the car...scary with the fames shooting up next to my leg!, sprayed it, allllmost got it out, ...then shop extinguisher and carefully used it up, then the 1st floor extinguisher, and while I got the flames much reduced they kept popping back up...then the 2nd floor, and finally the basement extinguisher...5 in all!.....remember this is deep freeze CT, snow is 3 ft deep all around, stairs are ice covered, it's a miracle I didn't break my back in a panic and fall LOL. I called 911 in the middle of the 4th attempt, and then watched it burn....freaking out...I had to try SOMEthing, and I remembered a 5 gallon container of rusty water from purging my furnace....and THAT did the trick.

The fuel line had split, right near the pump, up under the car drivers side, VERY tricky place to get to, and even though I'd shut the car down, it kept flowing.

After it was out, I ran into the shop to get a pan for under the car to catch the fuel and the FD guys arrived.

I didn't get there in time to stop them and they, as expected, made SURE it was out, very heavily dumping an entire bottle and some water too, all over the open carbs (I'd pulled the air cleaners off to spray some starting fluid, it was so cold)

What a mess.

So, it was down a hill, and without power I couldn't move it. Next day we got 2 more feet of snow, and then I got the flu, and then I was behind on a huge work deadline and worked for weeks straight....

So, it didn't get cleaned in time. My bad. Just glad it didn't burn to the ground, honestly.

I got them off the car....and a local Porsche buddy gave me the recommendation for his favorite secret machine shop, so they said they'd rather pull it apart. So they are there. It looks like, at worst, 6 valves and seats and I'm back in business....hopefully!

I'm definitely getting a new top line bottle for the car!

It does indeed sound like you dodged a bullet as it could have been much worse.

What do the carbs look like?

They were new PMOs and they were not great, but I think they cleaned up OK. Phew. Those things are pretty dear!