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Old 12-02-2009, 08:45 AM
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LilSmoke LilSmoke is offline
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I used to have a 68 435. I ended up with a 500 center as the stock 350 cfm was not very responsive. Fuel pressure at idle is going to be 1 thing,also make sure the float level is right.Blocking off the heat riser is a normal deal.How many times do we need to preheat for those cold snowy days? lol After it warms up,try putting your hand over the center throat and see if it dies. You will know if its lean or not or has a vacuum leak. Also make sure you have the .110 needle and seat in the center carb.The stock is .097. Get a temp reading on the exhaust manifolds. Temp guns are cheap.Take a reading on the intake below the center carb.Jets wont effect idle as they are not in the picture, a high power valve will make it idle rich,just make sure it is a number lower than the idle vacuum. Its kinda hard to take a pressure reading with the stock fuel line,just disconnect at the pump and hook up a pressure gauge,it will run long enogh to get a reading.
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