A0136

The 300HP / 327 used in the 67 Avanti has hydraulic lifters. The R3/4 cams were solid lifter and noisy.

I would expect the R4 with the 388 degree camshaft to be the one as far as sound goes. i would love to check that experience off the bucket list. Steve I have a 67 327 Avanti and it has a great sound but the high compression R4 with a much more radical camshaft would sound angry.