Summit has a pretty good deal going on these pistons..The first is an SRP flat top..It has a comp. distance of 2.062 in. and piston head volume of + 6.00ccs...The Wiseco has a comp. distance of 2.050 in. and a piston head volume of + 4.00 ccs.. Both are flat tops and for a big block...Which would you choose and why?? Thanks!! Ted

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