My 72' 360 had factory flat tops, no reliefs std bore, just a rering back in the late 80's. They were rated at 8.8:1 for 71/72, but were so far down I wouldnt be suprised at how low they actually were. I stuck a windage tray in it, an old 224/
[email protected] .460/.450 Crane cam, matching crane single...