The PAC-1916 springs that are in them are at 160/412, so they should hopefully be pretty stable?
How much would a 1" spacer add to the mix?
I have no experience with those Howards lobes, so I don't know how stable they are.....but that should be enough spring to get it over 7K.
spacer? try it and see.....only way to really know.
closest match to that I've done;
448, 11.5 cr
EZ CNC-295, with PRH valve job and blend
Comp solid, 266/266-108, .600/.600 with Crane Gold 1.5's
440-3 intake, 1050 carb, no spacer
dyno headers, 2- 2 1/8 X 4
679hp @ 7000(about 30hp more than I expected)
563tq @ 5300
