I currently have a 1st Gen Dodge truck that I am currently researching on how to do a Hemi Swap in.
Holley makes engine and transmission mounts as well as a fuel pump assembly to go with it ( its for a 1991, no problems as a 1991 will fit a 1990 as far as I can tell) so the fuel delivery should be fine. As far as wiring this thing goes, I am leaning towards purchasing a 345 ci (5.7 Hemi) straight from Mopar performance and tying in their swap kit (including gas pedal, wiring harness, chassis harness, O2 sensors, etc...)
My question is, how difficult will it be to tie in to the existing harness in the truck? I have wired LS motors before... Will it be similar and straightforward as making our own fuse block, OBDII port and wiring like 3 wires? Hot, key on, fuel? I`m sure there is more to it than that.
DIY Hemi has a project 1985 Dodge D150 they are swapping a Hemi in as we type here, so I suppose I still have a lot of questions regarding this topic. Any and all help is greatly appreciated!
Is there a certain type of diagram I need to go by or is buying a harness the way to go? Like I said, If I can just go by plugging in the harness to the motor and transmission and I just need to wire some relays, fuse block and a diagnostic port the boys shouldn`t have an issue wiring it to the existing truck.
Blake I know his site has a preexisting harness but its only for truck motors. What would you recommend in terms of a harness? Thanks!
If you can build an LS harness, you can build a hemi harness. They are equally as easy. Some of the circuit names are different but the basic functions are very close of not the same. It really just depends on if you want to do it or pay someone else.