454 mpi up grades...
 

Bought a new boat in September . It is a 1994 35 lighting with 454 mag mpi's 385hp bone stock.. I bought new exhaust for it and want to up grade the cam and the ecm.. Any suggestions. Right now it has a flat tappet wanted to go roller thinking of the 731 grind. The exhaust is the emi thunder with dry tails. Thanks Robert.

the mpi is 330 the mag is 385

It is the mag mpi

the older carbed 454 mags were 365,the newer mpi mags are 385 i believe.

1994 Gen V Mags would have been carb motors would they not? If you have a Gen V EFI (Lingenfelter intake) then it is a 330 HP non-Mag motor. Looks just like the later 385 HP MPI Mag motors.

They made a GEN V 454 and 502 MAG EFI. They were flat tappet. Stock cam was GM#14096209. 220/220 .500/.500 115lsa. Upgrading to a better hyd roller would be a step in the right direction.

I take that back. You'd be better off pulling them out and selling them. Try and find a set of 502/415HP mags with around 500 hours to drop in. Its not worth doing modifications and will significantly reduce resale value. :whistle:

I see what you did here lol

im curious,does the 1994 gen5 engine have forged crankshaft&pistons?

They do if it's a "mag". Mike Sommers had 1995 gen v 502 mag MPI engines. He had them redone and installed stroker kits to make them 540's. His original GM forged rotating assemblies were removed. When I asked him if he wanted to sell me them, he said too late because he threw them in the scrap bin. :(