Everything else being equal ( balance, coatings, etc) you should be able to rev the 402 as high/higher than the 427. 402 would have a smaller circumference, so less surface area friction, and less piston mass on the same rod and stroke. Can a more experienced member please veify/discredit my modest understanding please?
402 Stroker...LS7's make great power but in car as heavy as the GTO id go 402 stroker with production or aftermarket cathedral port heads...may not make as much peak HP as LS3/LS7 headed cars but torque will be much better In my opinion
when it comes down to it 25 ci is the difference. now i just have to figure out what head and cam i want on the 402 planning on staying with a ls2 style head.
resleeving an LS2 block $2000.00 in machine work alone , LS7 heads minimum of $2500.00 for stock take off heads from ebay not taking into account most people try to keep the Ti valves, offset rockers , LS7 intake , wet sumps vs. dry sump
F all that BS
402 , 416/418 no matter...when you get to 4.125" and bigger is where the LS3/LS7 heads really showm their potential...Im running 243's on a 418 LS3 and its worked out fine... great torque , pretty good HP ...