Quote:
..i think the factory rating was for NHRA blueprint specs.
a '69 340 would be 10.5 if built to the legal NHRA specs which allowed 63 cc heads etc.
a stock head is 70 -72 cc and will probably yield about 9.0 : 1 or so.
...but you really have to do the math.
69 340 nhra specs...allows 63.3 head cc ...piston is .045 above deck...head gasket is .035
I bet the compression is higher then 10.5 to 1...
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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