Good morning , I'm in the process of getting engine parts cleaned up and magnafluxed for a 54 f100 project. I recently traded for a 1957 312 with G heads B intake and Ramhorns. The 312 is stuck and looks as if it has set for years. Just removed the Ramhorns, intake and one head . My questions is, is it nesscesary to magnaflux the intake, are they prone to cracking? All the bolts came out easy enough and threads look good, just has at least three layers of old paint. Thanks.

John

With a manual choke you can block the heat riser on both sides with a very thin piece of stainless steel or similar metal that will not burn through.  I like to use the very old thin putty knife blades that are flexible, and worn out.  Cut the metal to match the gasket hole, and if you really want to get fancy, take the metal ring out of the gasket that seals around the heat riser hole, and place the piece of shim material where the metal ring was and use a sealer to hold it in place.  Joe-JDC

JDC