Engine number will start with JP or NP, easy. Rockers look exactly like all early Holden 6cyl, XU-1 didn't get fixed rockers with bridges like HQ onwards 6cyl and 253/308.
Engine number will start with JP or NP, easy. Rockers look exactly like all early Holden 6cyl, XU-1 didn't get fixed rockers with bridges like HQ onwards 6cyl and 253/308.
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