Should I chance it?
I was using 20% gross to net and then 20% automatic trans factor (and guessing).
Cam lift math should be correct though, eh?
80s stangs would use net HP figures natively, right?
Real men go by what it makes at the tires. :) j/k
The typical estimate is you're losing 15% off of net horsepower through the drivetrain with a stick. All the drag race calculators and what not seem to use net horsepower.
Gross to net is not a 20% loss, though that might explain some of the ridiculous horsepower numbers I hear sometimes. LOL!!
Using that method (and assuming I'm only losing 15% through my 904), I could say my car is making 500 gross hp! - nevermind that I'm only running a water pump and alternator - WOOT! who needs a hemi?!
Even using those numbers, I still only come up with best case rocker ratio 8hp at the tires being 12hp, and sled to roller would be accounting for some of that.
(8 (rwhp gain) / .85 (stick to net) = 9.411) / .8 (20% net to gross) = / 11.76
Either way, the metric I care about would be .1 at the track (on a good day).
Yes, cam lift math is correct. Easy formula is current lift/current ratio * new ratio.
I LOVE my magnum. If the OP can pick one up for seriously cheap it might be worth looking into, but be aware that the swap has a tendency to nickel and dime.
But so does the magnum head swap...gaskets, pushrods, rockers, springs, machining, intake, head bolts. If you can figure all the costs beforehand to be acceptable vs, just buying the Iron Rams from hughes, and you can find a set of good heads, I say go for it. I've been very curious forever about what a set of those type heads would get a stock shortblock 318 car, I just haven't been able to justify pulling out the 5.9 to find out!