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Hello Peter, the compression on al 6 cyl is about 4 bar. I have no leaks or cracks on the inlet. From what I can find is that carb is orginal for a graham paige 612. I found some info about the standard size main jet the carb comes with and it should be a Zenith C52-6-25. The adjusting is C71-21. Is that something you can get you're hands on? I see you are located in Switzerland so that would be awesome. Yes, the strange thing is that the last time when I checked the spark plugs cyl 3 was fouled. At first I thought I had bad piston rings on that cylinder but now it is cyl 2 so it could be a jetting issue.

It has a remy delco 639v distributor and zenith 11644 (Z1-162) carburetor. Thanks again for this info graham man, but the ignition parts are 100% good. We checked the distributor and all components on a test bench. And we resetted the timing as described in the manual you shared. This is how my spark plugs look. And this is what I found in the zenith manual. I know the number of article 56 but I need part 54 for my carb. The Solex X130 jet that was in it looks way different than in this exploded view.

Hello guys, we checked all of the ignition parts again, I went to a guy who has some oldschool sun engine testers, we put the distributor on a testing bench and everything is good. Coil, condensor and firing order was also good. The car still runs poor. I checked the spark plugs again today and they were all 6 black. I was wondering it could be a jetting issue so removed the main jet and to my suprise there was a solex X130 jet in it. There was also a normal plug to close the main jet hole, in all exploded views I see main jet adjustment (zenith C71-21). I want to buy this main jet adjuster and a correct main jet, does anyone know the correct size for a graham 612?

I'm hoping someone can help me with making our 612 run properly, I'm out of ideas.. I have around 4 bar (60lbs) compression (cold) on al 6 cylinders, great spark on all cylinders but it sounds like its only running on 3. Does not start withouth start pilot and after a small ride the first 3 cylinders are significantly colder than the last 3. I cleaned the carburator and made sure that all jets are good. Replaced all the ignition parts (spark plugs, wires, condensor, coil, breaker points). Set the spark plug gap to 0.6mm (0.023"). Distributor shaft does not have excessive play. The car has 0 power and I have to advance the ignition fully to get it somehow moving, which causes the engine to run hot on a warm day. The breaker point gap is set on 0.5 mm (0.02"). Yesterday I pulled the valve covers and inspected them, everything looks good and loose, still have to check the valve lash but on first sight it doesn't look abnormal. I'm out of idea's, was thinking about pulling the head off to check the head gasket/pistons but it's not easy to get a new head gasket for this model in Europe. Does anyone have some tips I can check before pulling the engine apart? Engine running and driving Valves from the first 3 cylinders

I am trying to find a manual for my 612 graham paige. Been searching the internet for information about the engine but can't find anything whatsoever. My 612 is running pretty rough, I've checked the compression and replaced all ignition parts but that didn't solve the problem. Need some information about how to set the timing right etc.

Hello Graham Man, I was hoping you would response, you seem to know alot about the graham cars. Thanks for the info, it is a sedan and I will check those places. Can I send you a PM for some more information about the orginal 6 cilinder engine, etc? There is very little information to find in europe about these cars. Thanks in advance!

Hello, I just bought a Graham Paige 615 which was shipped to Belgium in 1945. It has some documents but I cannot find the VIN and body number on the car. Does anyone know where these numbers are located? Thank you! Nick