Current engine specs
4.150" bore x 4.0" stroke based on 1978 XX400 block (433 CID)
Studded 2 bolt mains with Canton road race oil pan.
250° - 256° (@ 0.050”) solid flat tappet cam, 112° LSA installed at 108
Ported #12 casting iron d-ports with Ferrea valves and beehive springs 166-168 cc intake runners, 70 cc chambers. (11:4 comp ratio)
Cast iron intake plenum ported with Q-jet and 1" spacer
Heddman 2" headers
Intake rockers: Harland Sharp 1.65 (measured 1.72) net lift after lash .570"
Exhaust rockers: Harland Sharp 1.50 (measured 1.58) net lift after lash .520"
Cranking pressure: 190psi
Dyno'd at 520
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