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Re: 1966 mustang sparks a flame!
Either the intake bolt is loose or the gasget is broke by that bolt. But most likely the intake is cracked around that area. take bolt out chk. close for a crack around bolt hole and the intake runner. Is intake cast iron or aluminum? Its more likely to crack if its aluminum.
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Drain antifreeze -DON"T POUR IT DOWN A STORM DRAIN - then remove valve cover, Remove exhaust from head assembly. On this engine the head is also the intake manifold - it's cast as a unit. Remove carb and remove heater hoses from carb base plate. Remove head bolts and discard. Break head loose from block - may have to smack it a time or two to break gasket loose. Get a buddy to help lift the head off the block - it's fairly heavy. Clean gasket surfaces on both head and block. Install new gasket onto block - pay attention to gasket orientation - it goes on only one way correctly. Reverse procedure to re-install - USE NEW HEAD BOLTS! Silly to try to save $20 bucks on bolts and ruin an engine.
Apply sealer to both sides of the gasket and position it on the pump. Hold the pump in position on the mounting surface and make sure the rocker arm is hitting the cam eccentric. Hold the pump tight against the block and install the bolts. Tighten them alternately, hook up the fuel lines and start the engine to check for leaks. Hope this helps.
You can remove that center bolt easily with an impact gun. It has normal threads on it. An impact gun will prove to be an affordable tool that you will use again. You can get an electric one from Harbor Freight. They make the job of removing tough bolts much easier. If the engine is in the car, you might not have enough room. You can use a ratchet and if the engine is turning, you can hold the pulley with another tool sold at Harbor Freight called a rubber strap wrench.