Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Many times original engines are pulled, & a combination of parts end up back between the fenders. have you by chance sent off for PHS docs on the '71 convert to see what the original engine was?
To ID original use of your L109 dated 9799914 block, going to have to look on the block face on the passenger side & see what the two letter ID code is that is stamped right below the 7 digit assembly number. The most common two letter 400 ID codes for '70 Pontiacs are: YD (400 2 bbl auto Catalina) & XH (400 auto GrandPrix). The 9799914 block would have only been from a RAIII GTO or F-body, IF as an original '70 usage block, & the original two letter engine ID code is YZ or WS. On the heads, it's any ones guess why the 7H1's were used... my guess, they were handy. Have, myself, a pair on very low mile '72 350 engine, not sure why I keep that engine around. might need it one day to move a roller, I guess..
Love to hear more about the '71 convert!