most likely the XH coded 400 is a '77 400 complete w 6X-8 heads, originally out of an A-body or F-body (Formula or T/A). Look for the 500557 casting number on the cast area coming up from the oil filter hsg mtg. pulled several '77 XH code 400's while had entice core deal going, mainly pulled them for head cores, timing cover, sheet metal, & hardware.
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Buzzards gotta eat... same as worms.
Last edited by 'ol Pinion head; 12-09-2019 at 09:34 PM.
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