So I'm going to toss this one out there as an option, not interested in making $$$ off of this sale either, but I hope you guys already knew that.
The current 596 casting I have on the 360 motor will (most likely, not 100% sure yet, but like 95% there) be coming off this winter. I am starting my stroker/W2 build, so literally I may be pulling the motor within the next few weeks.
If you want, and are willing to experiment a tad, I would be happy to part with these. Keep in mind, they are heavily ported, some great numbers to prove (flow-sheet included), but they also have had some fixes on them, like the pin-hole coolant leak in the exhaust cross-over passage that is currently epoxied. Anyways, is it broken? Nope...but is it 100% sure fix...nope!!!
I ran them over the past 5 seasons, I am still happy with them. I ported them myself (two separate times, and therefore have the flow numbers to show the impact of the changes), a pile of hrs went into these, but like I said, they were a great experiment for me and I learned a [Edited by Farley's]-load of stuff from them.
Do a search on the forum for my old posts, I think I detailed a lot of the stuff that was done.
Anyways, just an option, crazy one at that I suppose unless you are the kind willing to walk that "bleeding edge"...LOL. Point being, you'd be getting a set of awesome heads that flow sure numbers, the question is: are you willing to baby them in case the need additional TLC, because eventually they may need that?
All in all, if you want solid, reliable heads that will serve you well, you are best to pick up a new set somewhere, I would not recommend re-conditioning a set of OEM heads.
1) intake runner volume - 178cc
2) combustion chamber volume - 61cc
3) 2.02/1.60" valves, 11/32" stem
Here are the latest flow numbers:
LIFT I @ % flow E @ % flow I @ 28" E @ 28"
0.100 21 17 67 57
0.150 32 23.5 102 79
0.200 43.5 31 138 104
0.250 55 37 175 125
0.300 64.5 41.5 205 140
0.350 73 45 232 152
0.400 79.5 47.5 253 160
0.450 84 49.5 267 167
0.500 88.8 51 282 172
0.550 91.5 52 291 175
0.600 89 52.5 283 177
Oh [Edited by Farley's], I just re-read your post, you have already gone done the Mag route...LOL, oops, disregard my post...ha ha...