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Steve, Had the same problem with mine. Replacement diaphrams are readily available and easy to install. Partsource carries them among others. Not expensive. I think this will fix the problem. Need to be careful of the two hose connections on the housing. They tend to corrode and are easily broken. N...

Great article! I struggled to rebuild my SWB's rear suspension and springs many years ago and it was an enlightening experience. Wish this article was available then. My shock when I realized after restoring and reassembling the springs that their shape had nothing to do with the springs that came o...

Steve, can you isolate this to a specific cylinder bank? Is there any chance one of your spark plug wires is mixed at the distributer cap? surprising how well the engine performs with a a pair of mixed wires and how subtle the results are.

Jim

Restoration of original leather seats has been a hot topic for some time. I thought I would share my experience. The seats in my 1962 250 are original. Their condition was not good. Although there were no cracks or tears they felt like cardboard and had developed a high shine. I was concerned that a...

Hi John, You have nailed it in just one sentence. Next time, I'll take Mark's advice. The Rolofs system continues to intrigue. I think their use of a smaller diameter cam roller is actually needed to bring the elephant foot geometry into line. This offsets the extra length of the elephant foot screw...

Hi John, I’ll try to describe this as best I can. Tom may have some additional comments to help this along. The problem with valve train wear is caused by two things: (1) Wear of the valve tip and adjustment screw resulting from compression loads (i.e.: the hammering of the valve adjustment screw on...

Hi Tom, It's taken me a while to get back to this, but I did contact Geof Ohland at PartSource regarding stainless steel valves and associated stem hardness. Geof states he has stainless steel valves in stock for virtually all the V12 engines and that their stem hardness is fully compatible with con...

Yes, I had forgotten about this kit. I have heard good things about it. I assume it requires no modification to the rocker. Replacing the roller bushings with needle bearings has been around for a while and it seems like a smart thing to do. What is the cost of the kit? Does either Tom or Dyke have ...

I have seen them used but have no direct experience. The guy who bought my 16,000 mile original condition 275 GTB was talked into rebuilding the engine and had them installing. The good news is they provide much better contact with the valve and because the head articulates, they reduce side loading...

Tim, I am impressed that your lash caps showed no wear. Mine were defnintely worn after only light mileage. Still have them as a reference. I used Manley caps for both engines. I had checked the hardness before installing, but I don't recall the number. The fact that Manley sells caps says something...

Yale, I don't believe the stainless valves had anything to do with your valve seat problems. They were rebored too deep by a prior rebuilder I don't recall the condition of your valves when the heads were rebuilt, and I don't recall any comments about valve lash caps. Normally, the start to mushroom...

I had the opportunity to check out Yale's engine when Brian first removed it and during repair and rebuild. It was certainly a job for a good welder and machinist, and it's getting harder to find knowledgeable talent to do this type of work, especially on old, porous aluminum castings. I was pretty ...

I would also recommend Partsource. Geof does a very good job locating hard to find items and I have always found his prices fair.

Jim

It seems that in the mid 60's Cadillac developed an experimental V12 engine bearing many similarities to the Ferrari 250 inside plug engine. It never went into production, but the attached link shows the results. Facinating and totally new to me. 7.4 and 8.2 L configurations with up to 500 hp. It wa...

Hi Tom M. Very nice looking car. What is the serial number and mileage? Do you have DFI or DCZ carbs? Does it have air? Glad to hear you are willing to roll up your sleeves and work on it. GTC's are wonderful cars and (usually) a pleasure to work on. There is a shop manual and most parts are availab...