Years ago while in the process of building a 401 race engine, I read somewhere that Mopar 440 sixpack valves would fit in the 401-390 heads. They are larger than AMC vales, much stronger and flow much better. I had them installed in a set of early 390 dog leg heads. Also I had the heads machined for screw in studs. I cut Ford Boss 302 guide plates in half and used those to guide the push rods along with roller rockers. Very strong engine.
I believe a picture of that set up is shown here in the forum. They are in a 74 beige AMX.
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Thread: Mopar valves in 401
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Fri Jan 23, 2015, 05:01 AM #1Junior Member
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Mopar valves in 401
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Sat Jan 24, 2015, 07:12 AM #2Junior Member
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Came across these photos of the heads. Mopar 440 sixpack valves installed.
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Sat Jan 24, 2015, 07:17 AM #3Junior Member
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Two more photos.
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