Originally Posted by rickyrockola1
Ok guys, I'm back with another problem that I hope someone can answer. I bought a 93 model LT1 shortblock .do I have to have a reverse flow intake and heads. is this true?
Yes you have to use reverse flow heads and intake. The LT1 and 4 have coolant flow passages where normal flow blocks and heads have an oil return. Using standard heads on a reverse flow block will result in a massive coolant leak into the oily parts of the engine.
However, reverse flow heads can be modified to run a standard block by welding the unique coolant passages closed, this is possible because these heads are aluminum. This still takes making an external coolant return on the ends of the heads as there is no connection on the manifold face to return coolant to a route as part of the intake. This can be built, but it is very difficult fabrication and then welding of several small detail parts to form a passage. Of course after all this welding the heads have to be re machined.
Cast iron doesn't take to being welded without the use of expensive heating till the whole block is dull red. Then welding in plugs, allowing it to cool at a controlled rate for a day or two, then magna-fluxing to see if you got lucky and it didn't crack. When done, the block is warped and needs to be completely re-machined. It's easier to find some LT1/4 heads on
Ebay, or sell the block and get something that works without all the difficulties and complication.
As you can see I haven't got to the intake as, I'm sure you can see, there is no point.