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rotorwrench · 08-25-2018, 10:06 AM

Ford made new cylinder head castings for the 24-stud blocks after the war but they were 41A types. I'm not sure if they made any replacement stuff for the 21-stud engines in that time frame. A lot of folks just installed a later engine if the old one cratered out.

The weak link on the intakes made from aluminum was the exhaust cross over heat riser. Engine exhaust is erosive and that early type aluminum was not very robust. The truck engines were likely where they started to have problems first.

08-25-2018, 10:06 AM	#14
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,422	Re: Intake Manifold differences Ford made new cylinder head castings for the 24-stud blocks after the war but they were 41A types. I'm not sure if they made any replacement stuff for the 21-stud engines in that time frame. A lot of folks just installed a later engine if the old one cratered out. The weak link on the intakes made from aluminum was the exhaust cross over heat riser. Engine exhaust is erosive and that early type aluminum was not very robust. The truck engines were likely where they started to have problems first. Last edited by rotorwrench; 08-26-2018 at 09:56 AM.