Anyone have experience running the Lunati SFT 402A2LUN (272/282, .238/.248, .550/.570”, 112/106) or 60240 (266/276, 233/241, .570/.590, 110/106) in a 10:1 496, big valve ported 049 heads, dual plane intake and 750 Holley?
Looking to run with stock stall and 2.56 gears @ 4050 lbs. The stock converter and gears is the reason for the smallish cam.
Currently have 10.5:1 467, 781 big valve heads, with Summit HFT K1303 (304/316, 238/248 @ 0.050”, .540/.540 114/109) cam which runs really well for what it is, looking to knock off about 1 second (runs about 1.99/12.9/107.5 right now). Trap rpm at 114 mph will be about 5400.
I’m conflicted right now, part of me is saying run the same Summit cam (because I need more torque to get out of the bottom), even though the lobes are “lazy,” since the lobes are less likely to have issue (and despite the fact a 496 needs about 15 degrees more at 0.050” to peak at the same rpm, given the same head flows).
Part of me is saying, tack on 14-16 degrees @ 0.050” and don’t worry about getting out of the bottom, the additional 1/4” stroke will bring the torque I need.
My compromise is the 402A2 or 60240, the more aggressive lobes, even though the 0.050” durations are the similar or even less, I should have all the torque I need and much improved top end.
What say those who have run either or these cams? I think like the idea of 112 or 114 LCA to smooth out the torque curves but I don’t believe I’m well informed enough to ask for the change.
1981 Malibu wagon
Best ET NA 12.20 @ 110
Best ET w/N2O 11.47 @ 117