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Old 12-15-2012, 06:50 PM
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Looks like current R09 and R07 are what they have used the last few years. The ls7 used to make the r07 is a 4.1 to 4.4 bore block. And the newer blocks all appear to be 4.5 bore for the r09. This is the same type engine used in the pro touring car corvette. The way they are built is pretty sweet you can buy this stockish form but a ls9 is a 2013 427 block punched out way over tolerence. Kinda of hard to think you want to build one of these. You can buy the blocks with proper bore but they are not cheap either and you still can build the 427+ cubes with that block in a short stroke form that would make insane power. So no real reason to pursue the 358 nascar spec engines. There are some much more interesting combos with those borse and valve sizes to be made. A street drivable 800 hp without a turbo is no problem. The heads are amazing and will never be the limiting factor of making big power. The biggest limiting factor would be the crank block and rods. And they are forged cast is not sold in those sizes.
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