timpryor said:
hey RGR what were all his mods?
The Important ones were:
4.2 (stock bore, so it was not a 4.3)
LT's and good duals (2.5" I believe)
small cam (I'd go bigger next time and Justin is looking into it, I will spec it)
BV heads (but I would use stock valves with stock 3.81" bore block)
wildly ported intakes and 70mm TB
plus a killer tune by Jerry of FordChip
Justin needs a bigger MAF and the cam will be changed later,
he may also try 1.8 RR's just to see if that helps any. It should,
but not nearly as much as a bigger cam. 1.8's only add about 4%
to the valve action and around .020" of lift is part of it. I will add
considerably more to the next cam, lift and duration both. But not
too much extra duration, as this combo is easily beating a competitive
4.3 that has nearly 20* more intake duration! Gotta match the intake
style when you cam it up, too much duration kills torque and when the
torque is right, it carries thru with killer HP. This is the SPI's best trait!