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Re: Lets talk Small Block
The iron Vortec heads have the spark plugs in the original or at least very close location. The Fastburn heads have angled plugs. Both the iron Vortecs and Fastburn heads have raised exhaust ports.
The Vortec heads cracking issue is due to 2 things. 1) lightweight castings 2) The original factory intake manifold gaskets were prone to failure and leaking coolant. If this was not caught and the vehicle continually driven, the engine could overheat. This would cause the cracking.
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