[rkreigh]

generally heads are hand ported, flowed, digitized, and then the CNC program can be generated

the modern technology makes this much easier. a digitizer pen is used to trace the port and put together a 3d cad image which can be refined and adjusted all you want to test with

but since there aren't a whole lot of people stepping up in line waiting to get their heads ported AT ALL we're durn lucky Pete took the time to capture a CNC of his handiwork

we were "debating" LS vs LT5 cyl head flow. while we clearly have improved flow quality and velocity 330 cfm is a starting point for a good head

we seem to be "flow limited" to around 750 hp with the heads

you can go up in displacement, but not see much additional HP due to the flow limitation

I think it's time for a billet head, using an improved chain drive, with a better port design

nelson has done it, and with the modern tooling the cost of this debauchery will eventually come down

my old crusty hands (like phrogs) are salavating as we see more ZR-1s getting parted out and the lt5 parts hitting the pipeline

"experimental" builds become more affordable

I'm doing LS motors right now (because I can) not by choice

one day I hope to boostamuv on a stock block LT5 on E85 and see if I can get it to live at 800 with stock internals

my bet is it will do just fine, factory cams and all

looking for a decent price on a crate motor or good used one (high miles ok too, just want good cyl sealing!!)

we are doing this with 4.8 LS iron block motors and finding the limits are quite high for the 2004 and up motors with the better pistons and ls2 rods

and many people are literally throwing these engines away because they are so plentiful I have 3 of them in the garage right now if anyone needs one. a few sets of forged internals, ect...

I'm really thinking of pushing a stock short block with studs and wider ring gaps to 800 hp which is nothing new to these guys and seeing what happens!!