brad black wrotei don't get the obsession with 748r heads.
you need to think in terms of inlet closing point more than centreline. centreline is just a mathmatical number, inlet closing is what changes how the engine acts. also exhaust opening. i wouldn't use a 748r exhaust cam if i had something better, and possibly not a 748r inlet either.
Well Brad, I was never obsessed with 748R heads.
Initially I bought bigger valves to fit in my original SP3 heads, but then I just happend to run into these (empty) 748R heads. I was told that these heads could be an excellent base for my project if the intake and exhaust ports were optimized. I also liked the idea of not meddling with my SP3 heads. And then I was told that the 748R cams would be better cams than the G-inlet and A-exhaust cams I was planning to install. New architecture cams: shorter duration and bigger lift. I know people like the SPS (T1?) cams, but this is what I went for. Also because of the positieve reports about the 853R (engine character) I read, these cams kind of appealed to me.
So it got a bit out of hand. Next was the S4 cases I wasn't planning to do (but hey, with these 748R cams the motor is gonna rev, mind your cases!). And then the carrillo rods I also never intended to buy, but hey, when you're doing al this stuff it gotta be perfect.
I hope it will al work out, but am scared I will eventually be somewhat disappointed, hearing all these things about the 748R heads ands cams.
