Compression Ratio on A BBC Blown Motor

What would be a safe compression for a Blown BBC 14-71 hh dart heads Rodeck solid block motor? What would be the most compression you would want to run?

 

We Run A Solid Rodeck With Dart Heads And A 14/71 Hh Littlefield We Run 11.4 Compression Ratio I Have Spoke With Jim Oddy About This And Was Told We Right Were We Need To Be Hope This Helps

 

We run a solid Rodeck with Big Chief heads and a 14/71 HH we are also 11.4-1.

 

For what its worth, back when I was running Top Dragster..10.8 could run it like a bracket car 11.2 to 11.4 made good power w/reliability. In my final year I turned it up to 12.2, went our fastest (6.14) but it was a bomb if you missed the tune-up, which I did quite often as I ran w/o computer! Keep it in the lower 11's and you will be happy, Tim

 

How Hard Are You Going To Spin The Blower I Ran 12.i And Spun It 47 Over With No Down Nozzels But When Hit The Throttle It Was Like Stepping On A Cats Tail I Never Hut Any Thing I Agree With Tim Lower Eleven Are High Ten I Help A Friend With A Blown Chevy 14 Degree Heads I471 Superman On It And Its A Jim Oddy Motor It Appears To Be 10.5 Are 11.1 Motor Keep Pouring The Fuel To It Till It Slows Down That Should Work

 

I ran between 10.5 and 11 to 1 ( ~472" BBC and 441" Rodeck many years ago). We had smaller (and inferior) blowers compared to today, but the flame travel on the top of the piston seemed to be good in that range. Looking back I probably could have increased the compression (11.25?) and decreased the advance on the mag.

 

Were looking to overdrive it in the 20's to high 30's port nozzles all the good stuff.MSD-10 or pro mag 12 for ignition havent decided yet.

 

My 496 brody headed bbc 14 HH 50% over 9500rpm. 11:1 that area seems to work well give it lots of fuel like they said.

 

compression

we run a 4.5 bore 477 chevy 11.7/1 compression, 160lbs cranking pressure, 35 deg.timming, 36 lbs boost, msd 20. 9000rpms in the lights

 

racer....... a 12 is not enough.....go with a 20......you will be alot happier. just my 2 cents