From experience, a 4.75 arm is not a great choice for a street car that gets driven. I tried that and it scuffed the heck out of the piston skirts. I’m now running a Molnar 4.375 crank. Piston stays in the bore way better.
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65 Lemans Street Car - 521, T400, 3.70 9". 10.13 @ 135. 3770 lbs. Drag Week ‘14, ‘15, ‘17
63 Lemans Race Car- 8.81 @ 151, 5.60 @ 123(SOLD)
67 Bonneville ragtop
74 Firebird - 455, e heads, TK0600 in process
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