The 3500 should be a reworked 3100-3400...
I believe that the 3500 and 3900 should be in the same ship...
The 3100-3400 had some issues that could be lived with, Piston slap and lifters that had some chatter... Intake gaskets on these motors are junk tho... And when you replace those gaskets you may want to flush the system and use a coolant other than Dex such as Prestone Longlife... I'm assuming I see chevy or olds Minivan on the other side with a 3400
Your Montanna SV6 with the 3500 is a 60* Chevrolet Engine( Same as the 3400 in the other van, and the firebird( old 3.4 pushrod non 3400 ), cast iron block with alluminum heads, with SFI, All of these engine have the 60* cylinder bank seperation
Roughly 200 Hp and 220 ft lbs is not bad for a 3.5 V6 when comparing to a 3800 Series II L36 making 205 Hp and 230 ft lbs, the other van with the 3400 is also SFI and produces 180 hp and 210 ft lbs
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote