Quote:
Originally Posted by GOSFAST
Being a Flathead is definitely not going to be running at 7000/8000 RPM on the build were talking here I would use the 52% number! I would definitely also do something (like our girdle) to help keep it all together, at least on that "weak" center main area of the block (see the photo below)! I would also add, if Ford didn't "hang" the 2 large center counterweights on each side of the center main on the later units they would never have been able to keep that main brg from disintegrating. The Chevy race cranks have this same setup! Without those counterweights on 4.750" stroke Chev the mains will never survive, been there, tried it!
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"Being a Flathead is definitely not going to be running at 7000/8000 RPM".
This part of your statement is totally wrong. An all out vintage circle track engine will have the hp peak in the 6500 to 7000 range and will be run 10 to 12 % over that at lift point on the track. That equates to somewhere over 7000 twice a lap. (assuming you are not in traffic)