It's a 69 400 XX code block ,.030 over, CR around 9:1 heads are #16 SS valves pocket ported. Basically its the 068 GTO cam. Big block 7/16 rocker studs. Cast impellor ,
I cant say for certain I have burped it , I have filled , run, filled , etc. Until I thought it was full.
No mechanical fan , just a electric puller fan 2000cfm and its definitely pulling. I do have the x baffles.
im running 10 degrees BTC @ 650 RPM idle. but it will run hot doing 55 MPH.