F & G exhaust manifolds are very hard to come by. As John mentioned, the ram intakes got saved and the exhaust manifolds were an afterthought. Forget even experienced welders, seek out a company that specializes in cast iron repair like Lock-N-Stitch, and never throw a cracked, rare manifold away. Bob J From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of dplotkin@xxxxxxxxxxxxxxxxxxx
Sent: Thursday, August 11, 2022 9:47 AM
To: Rick Beckman <rocketman426440@xxxxxxxxx>
Cc: Ryan Hill <ryan_hillc300@xxxxxxxxxxx>; mr396@xxxxxxx; 93saturnfan <93saturnfan@xxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} F Manifold - JB Weld Drag racers might get away with JB weld on a manifold and a cooling system half full. Most of us will not have luck with that. I wouldn't waste a minute more asking about or trying to find welders of cast iron. Instead I would be looking for the manifold I needed. Danny Plotkin -----Original Message-----
From: "Rick Beckman" <rocketman426440@xxxxxxxxx>
Sent: Thursday, August 11, 2022 12:23pm
To: "Ryan Hill" <ryan_hillc300@xxxxxxxxxxx>
Cc: "dplotkin@xxxxxxxxxxxxxxxxxxx" <dplotkin@xxxxxxxxxxxxxxxxxxx>, "mr396@xxxxxxx" <mr396@xxxxxxx>, "93saturnfan" <93saturnfan@xxxxxxxxx>, "chrysler-300-club-international@xxxxxxxxxxxxxxxx" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} F Manifold - JB Weld Guys, What I have been told over the years by some pretty good Mopar enthusiasts, mechanics, and some old school max wedge racers on the subject of cast iron cracks is...... Drill out the ends of the cracks (supposedly to stop the crack from getting larger, grind a 'V' into the crack, and fill with JB weld. I am not kidding. I actually had an old drag racer tell me this. He had done it in the past when racing the early 60s mopars 'back in the day' on various cast iron and aluminum racing parts of the period. I know because I have an old 426 Max Wedge block that has been cracked between the freeze plug holes on one side of the block, welded up successfully, and it also has another crack on the other side of the block. I was looking for someone to weld this other crack up. The guy that I was confident could do it has now passed away. I have not attempted the JB Weld fix myself, and the block is just sitting in the back of the old shop. I was told the reasoning that it has worked and will work is that there is not much 'stress' in that area between the freeze plugs. The only pressure will be the circulating water from the radiator and whatever pressure the radiator cap is (10-12 lbs?) My real plan was to have it professionally welded and then just 'half-fill' the block just above the freeze plugs for strength. I have seen this half-block fill trick done many times. Coolant cools the cylinder heads and the top of the block with water while the oil cools the lower block to manageable levels. The engines were put in street cars and worked well with just a 'half-fill". I hope this contributes something to the decision. I remember my dad used a lot of JB weld on many things throughout the years on the big block engines of the 60s that he had, but he passed away a couple of years ago and I don't remember any of the details of those stories anymore myself. Though I would never recommend JB Weld for this particular task either, I have to say I was impressed by the stuff back in the 1980's on a different type of exhaust manifold repair. My Dad made the mistake of trying to get our Winnebago off the freeway one hot summer afternoon when we discovered we'd lost a fan belt on the 1976 Dodge 360. By the time he got it to rest and shut it down the engine was overheating badly. Replacing the belt took a few minutes once it cooled down but we discovered a large exhaust leak immediately. Upon removal of the manifold, we found the flange had actually warped quite dramatically on the centre ports and would no longer seal against the gasket. With the manifold off, Dad spread out what I recall being about 3/16" to fill the void and filed the mating surface flat as a temporary fix. It lasted more than 5 years and 10k miles before it burned out...... That was probably 35 years ago and epoxy technology has improved considerably since then.....just sayin'.
Agree also jb weld won't work I think better use crazy clue or duct tape should do the same barry --
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