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Message: <blockquote data-quote="atlanticblue98" data-source="post: 669537" data-attributes="member: 11091">to run the m90, you have to keep the singleport heads that come on our 94-98's and some say that is a disadvantage because they flow worse than 99-04 heads. but Shine1stang has proved that singleports can make great power. to get some decent number from a m90, you'd need to port and polish you current heads, or some spares from a junkyard. get a cam, smaller pulley, better intercooler. you'd make around 300hp that way. which is perfectly safe for the stock engine if it is in good condition.get a compression test done on your engine to see if it is good condition, you'll want the compression of all 6 cylinders to be around the same, rather than just high numberscheckout Roadhawg's V6, his is a great example of what a m90 v6 can do. but he has a MPX which is a upgraded version of the M90.he made 343rwhp with this setupSC Block 30 overStandard 4.2 Crankshaft6.125 SCAT H-beam rods8.5 Ross Forged PistonsTotal Seal RingsCam 218/224 .520" lift 112 LSA, 4 deg advMPX 25%OD with uncoated rotorsSC heads (home ported)60lb injectors90mm Lightning Maf85mm ThrottlebodyKenewagner Double ICLong tube headersOff-road H-pipe2.5 Mach1 Catback1994 Supercoupe 4R70W8.8 with Tloc and 3.73</blockquote>