not to mention...PRAY that you never have to replace a water pump or head gasket, which are common for going out on these...book time on a water pump in a grand am with a quad motor is about 8 hrs...head gasket runs upwards of 14-16 hours., and this is for strictly labor...no parts included...
420, I know you'd like more power...however, the ideas you've been having lately are simply more trouble than they're worth...your best bet is to just do what little you can with the 2.5, or sell your car and buy a V6 version....either way, you'll be into it for ALOT less than trying to do some type of bastard engine swap on it, no offense intended...
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Shawn's Auto Repair and Performance, SW Wis.
www.shawnsautorepair.procarcarezone.com
69 Olds Cutlass S
70 Olds Vista Cruiser Wagon
72 Olds Cutlass S, 12:1 470 stroker, JM40 solid lifter cam, TH400, 3500 10" PTC stall, 4.11 posi
74 442 455/TH350
79 Cutlass 455/TH375 sleeper
'97 GMC Sierra Ext Cab 9" lift w/ 37's