hairyclive25

late but new info BB Chrysler (383/440) manifolds will drop on with a little cut and paste work https://forum.hetclub.org/discussion/122452/better-performance-parts-352-packard sleeving the blocks and using the the full potential of the 5" bore centres allows 4.85" bores with siamesed sleeves, lots of pistons in that size now with a 4.5" stroke and the large bore this makes 665 cu in stock heads can be ported to give 300 CFM probably more with some welding and grinding The Iron Lung: Vintage Packard V8 Pumps Out 445 hp On The Dyno There is no reason an engine that large couldn't be capable of reliable 600-750 hp with the correct mods, custom ground cam, and good internals if the block is strong enough not to break; the 427 tunnel port ford made 630 hp stock with mild porting est flow 330 cfm the larger engine would make similar power probably about 4-5000 rpm with more available depending on good the bottom end could spin