Quote:
Originally Posted by Robert C.
The IA II (Indian Adventures II ) blocks water jackets were designed to pass water around the cylinders and remove the heat to the water the best that could be done.
When water comes in the front of a stock block it has only one way out and that is thru the block deck surfaces in to the heads.
We machine all IA II cast Iron and the Aluminum blocks dry decked. If you had to pay for this to be done on any other block it would be hundreds of dollars. We do it in the price of our block. It gives the user many options on how they want to cool their engine and cylinder heads.
Every block we sell has a 1 inch tapped holes in the rear of each cylinder bank just under the deck surface. This is so the user can remove the trapped boiling hot water that can't go anywhere in a stock block. Think about this? Water must start out cool entering the front and pass thru small holes in the deck thru to the heads. As it moves thru to the rear two cylinders it gets hotter and hotter. Right? But with the 1 inch tapped holes we give it a path out faster. It no longer sit and waits to come out the deck holes. You can do many things like plumb it back to the cross over. Or to the opposite rear head in to its tapped hole and thru that head back to the crossover. Thus is done to keep the water our of the deck and head gasket area.
Ask what others have learn why the IA II block investment is far better then spending money building up a hard to find 455 Pontiac blocks. The few dollars that the block cost over trying to make a stock block race ready is worth the money. It is like buying insurance for your investment.
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Tapping a few holes and installing pipe plugs shouldn't cost hundreds of dollars....buying an Aftermarket block over upgrading a junk factory block isn't even close the Aftermarket block wins hands down! We are so lucky to have 2 aftermarket steel blocks to choose from!
GTO George