Nnbs heads and intake

[OhFourChevy]

I'm wondering if they're a direct swap other than maybe milling the heads .03 or .04 or keep stock compression. I'm planing on eventually doing a mild cam like a zo6 or a 221/221 ...... from comp or Texas speed, in conjunction with the heads (port and polished) and intake manifold and possibly paired with a 90mm throttle body, I'm also curious if I'd have to modify my AirRaid Mit for the 90mm throttle body.
This is kinda a long distance off, but I'd like to do it all at once, as well as LTs and dyno tune

 

[01ssreda4]

Yes, direct swap. Dont you love that about these motors. Im assuming you're wanting to go from a stock 5.3 head to a 243/799 casting? Wouldnt waste my time doing a 317. You could cut the 243s from nothing to probably 30/40 with no issue. Then sit back and enjoy the new found performance.

 

[OhFourChevy]

Awesome, thanks, that's exactly what I was thinking.
Yeah, I'm looking for 07-whatever heads and I figure if I'm already pulling the heads, might as well ****** the intake and fuel rails while I'm there.