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I was gonna say the truck intake gasket with the crossover blocked will cause it to be cold natured, and will require a good warm-up in the winter, but you're in Florida so it may not be too bad. Also, be sure to lose the blue pump and get the Carter street pump. FWIW, anytime I've had your problem it always ended up being the radiator wasn't flowing well or a blown head gasket.

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UPDATE - when i installed a valley pan with the crossovers blocked i decided to pull the heads and check the head gaskets. while i was in there i noticed the exhaust valves were slightly recessed in the seats.

i guess the 906's did not have hardened seats... dammit.

i had a pair of 452 heads rebuilt with new springs, keepers, valves - the works.

i also had the radiator flow tested and it showed a 20% blockage (how does one measure that?).

i have it all back together now and it does not appear to exhibit any of the carb boiling with no tendency to bog after it has sat in a parking lot.

it is actually not that bad in terms of cold nature starts (i am running an electric choke).

in spite of a tendency to run hot on the interstate i plan on doing the first three power tour stops. hopefully i'll be able to see some of you on the road.

thanks MOPARTS

Ben

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The exh valves recessed ...or are they sunk ? ... check the face of the valve and the seat itself. If it is "torched" ...you have probs. But many valve jobs are done with a slight recess.

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truck weighs 4500 pounds - just cruising it on the highway.

i'd like to think it is the crappy alcohol blended fuel, non-hardened seats and no lead additives is what burned up the 906 heads.

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I had a 440 in my 66 D200 and tried everything with no sucxess until i found out that Edelbrock/AFT don't like more than 5 PSI. I put a regulator on it and the problem disappeared. Take off the cleaner right after you stop and see if there are fumes in the carb. If so, the pump probably has too much pressure.

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For sure not enough initial & you need that amt finalized (vac gauge method is good) then shorten the slots for 36 total (WO vac hooked up) then play w the springs then hookup the vac adv (if used). Right now your total is good but the slots are too long which is making the initial too low and the curve is too slow and that's what's hurting your performance.

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That's a really sweet truck, like it a lot! FWIW, I'm runnin my E-brock carb regulated at 3.5 psi and have even dailed it down to 1 psi with no leadfooting problems of fuel starving. Good Luck

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