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if its a small block with 3 freeze plugs each side of the block then it is definatly a 400. however, just because it only has 2 dosen't mean its not a 400, because there were some.
on the balancer, it is actualy a blancer, not a damper, so there is a section cut out of the outer diameter of the balancer to keep the assembly in balance. and there is a counter weight on the flexplate as well.
then there is always the casting numbers that you can look up
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'51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works
'05 1500 Crew Cab
RIP
'84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker
'80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's
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