Has anybody ever done either of these? I have built a few 383's, and they didn't need much block clearancing for the bigger stroke...how much worse would a 3.875" stroke be? I was dreaming up a new mega torque truck engine combo the other day and after running some numbers, it looks like this would work (on paper anyway).
400sbc, cheap 5140 3.875" crank with 400 mains, 5.94" GM PM rods, and any piston designed for a 4.125" bore, 3.75" stroke, and 6" rod.
350 sbc, 3.875" crank with 350 mains, 5.94" rods, pistons for a 4" bore, 3.75" stroke, and 6" rods.
I am thinking mid 9's compression, small base circle dual pattern cam, and a set of vortec heads. Looking for brutal torque under 5K, 6K rpms max. Shopping around, the crank, rods, and pistons would run about $1200 or so. Do you think it would be worth the effort? Are there any long term durability problems with piston buttons (required for such a short compression height)? The 5.94" rods would keep the r/s ratio within reason. Any thoughts?
'86 chevy 3/4 ton...9.4-1 355, vortec heads, vortec performer intake, 600 edelbrock, xe268, headers, duals w/turbo mufflers, BTO 700R4, 3.23 gears
'77 nova, 388, 200cc pro-toplines, holley 300-36, 750 edelbrock, comp 294s, 10" ATI, 3.73's
'83 ford F-150 XLT...351w, C-6 and 3.55's.