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60 degree v6 is a different animal all together it is capable of 1.5 to 2.0 hp per cubic inch with reliablity. there is a book out that talks about V6 performance. There are 12:1 piston for these and the 3.1L & the 3.4 are the same engine. with different bores and stroke. and are interchangeable. there is a web site just for them with a lot of info www.60dgreev6.com