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Well, this cap is HUGE! Wonder why. Perhaps Pontiac wanted to skimp in the lifter valley and then realized that they needed to utilize their quota of Cast Iron so they made the rear main cap big. Not, Main Caps are Critical to engines staying togeth...

Well, this cap is HUGE! Wonder why. Perhaps Pontiac wanted to skimp in the lifter valley and then realized that they needed to utilize their quota of Cast Iron so they made the rear main cap big. Not, Main Caps are Critical to engines staying together. DO NOT LISTEN TO IDIOTS.