Yes, optional 400hp F/G used water heat, special headers (not the same as J/K) and manual chokes. 405hp H used same setup with water heat and F/G headers and manual chokes (as seen on Bud Faubel “big red” at 2015 Macungie meet). F/G/H headers have no provision for exhaust heat and no heat riser/flapper, and are larger than J/K. J/K headers have exhaust heat pipe attachments, no flapper. BTW, the white 405 H we saw in the fella’s collection at Hershey this past spring – had exhaust heated rams not water, suspect it was either a clone 405 H or J/K headers were installed later (couldn’t see well enough). ’62 405 H was a dealer installed accessory, maybe some variation(?), they are too rare to draw any conclusions. The manual chokes on J/ram K are ideal. Both carb chokes can be set in nearly perfect synch, on/off and in between. In warm weather choke really only needed for cold start, can back off quickly to prevent carbs loading up, will stay on fast idle until the throttle is blipped to reduce to curb idle. I like electric chokes on F/G (if you are ok with non-stock), I have edelbrock chokes on my G with the 2903 AFBs, chokes open up rather quickly (a couple different settings can be chosen) and both carbs seem to be on same time line. Nice high idle but can get to curb idle fairly quick if desired, car doesn’t stall. Carl B. From: John Grady hi there is no need to “ vaporize fuel “ today on a day over 30 degrees or so — we have opposite problem with todays gas . carbs go dry sitting there at room temp . New cars have no heat risers or provision for them at all . FI richens cold mix but no heat . warm intake air also reduces power as less dense and so less oxygen . Everywhere we have aftermarket “ air gap” manifolds and baffles to keep hot oil off underside of intake , or insulation pads on some . No heat . This exhaust heat stuff dates back to 30’s when gas was like kerosene . plus —- no matter all the claims to contrary , — they never come off in synchrony giving erratic weird running during warm up , stalling , one on high idle other is not , lots of hassles around flap shaft rusting shut — and trying to match the warm up exhaust side time . Why chrysler dropped it in 62 as so many rams were pulled off F and G over stalling , slamming into gear etc etc . We cut the cars some slack , some banker or lawyer did not . And when it came back in 64 all that was fixed , some heat as Don describes and a manual choke(!) ( on a top end car!) I think edelbrock electric choke will give you nice high idle cold and both sides work pretty much on same time line I bought two kits ( chinese knock offs are half $ of edelbrock) and going to see how it does on converting our afb . As Don Cole says , no problems or any you do have are minor compared to the hassles stock can cause you , including burning a hole in ram under carb — if you get in it with flap stuck shut . And you don’t know that at the time ., been there . 405 F used water heat in there I believe? your mileage may vary , so do as you wish !! . I remember many times even at shows of our club someone can’t start an F or G and the dance starts .l Sent from my iPhone
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