I have a 400sb and I am need of different pistons. How can one tell whether the rod is a 5.7 or the stock 5.565? The engine is assembled. What part of the rod do you take the measurement from. I believe it is center to center. Thanks,

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• 412ci/sb

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yes it's center to center but good luck measuring them with it assembled.
best bet is to get the part# off the piston and call the piston manufacturer to find out.

 

Where are the p #'s normally located?

 

on top of the piston.

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350 4 bolt main, Speed-O-Motive 383 stroker kit, re-sized rods ground for clearance,TRW Forged pistons,10.7:1 compression,HPC Coated RPM intake, Speed Demon 750 cfm carb,World Products Sportsman II heads,2.02/1.60 valves, Comp Cam 1.6 roller rockers, Comp Xtreme 284 cam,240/246@.050 with .540 lift,Crane pushrods,ATI damper,Proform HEI and MSD6A box,HPC coated 1 5/8 headers, 2.5" exhaust with 40 series mufflers,TH350 with B&M 3000 stall, Powertrax NoSlip Locker, 4.11 gears.

 

There are no identifying marks on top of the piston. Is there any kind of marking on the rod itself? I have looked but see nothing.

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• 412ci/sb

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