I have a I6 with 5 spd manual in my '92 150. I want to put a 429 with a C6 tranny that came from a '73 LTD into my truck. other than some of the obvious problems are there any nasty ones hiding that someone may know about before I start. I'm still in the planning stages right now and getting things ready. The 429 is already pulled and mostly tore down. Any insight will help as this is the first time i have ever tried to install a larger engine than what came out.
Also any advice for the c6.like the speedometer. truck is electronic and c6 is mechanical.

 

Biggest problem is the six is fuel injected and the 429 is carburated. You need new frame mounts from an 8 cylinder truck. Custom motor mounts, a larger radiator for use with an automatic, hoses, brackets, belts, possibly replace the fuel tank with an older model, since yours has a fuel pump inside it, not a pick up assy. etc., etc., etc. If I could suggest finding an early 80s truck originally with an eight cylinder and automatic trans would be a much easier undertaking. You could keep the 92 to run for parts, or at least it won't keep you at the gas station all the time.

Robbie.

 

I don't understand. Why wouldn't the electric fuel pumps be better than the old mechanical pump. as for the other stuff you mentioned i have thought about those already. even needing a new oil pan with a rear sump.

 

in all reality.... if the car/ truck is street driven,some states will not issue a inspection sticker if the engine swapped out is bigger than stock...you could probably get away with a 302 or a 351W...check in your state before you do this..would be a big let down to do all that work and you cant get it inspected...zap!

 

by the way...about the fuel pump ????'s...the electric pump for a efi setup puts out WAY too much pressure to use with a carburator...mech pump=4-7 lbs pressure...efi pump=80 lbs pressure...(your float bowls wont like it)...zap!

 

If it was me, I'd find an older carburated truck to begin with. Unless you don't plan on driving on the street. Because as zapster noted, the engine swap would hurt you at inspection time especially if you have to do emissions testing where you live. Some of the older 80's trucks came with 460 engines in them. F250s up until 97. The 429 is the little brother of the 460.

Robbie

 

need to know how much horse power does the 4.6 have

 

A friend of mine put a chevy 427 in a 72 VW Bug and the inspection people didnt give him no trouble but it is South Carolina.

 

well thats all well and good in south carolina....up here in mass you'd be outta luck...all i'm saying is to check where you live....(or if you have friends that are willing to put there inspection licences up for grabs)...zap!

 

Concerning the inspection issue, here in Georgia, the only vehicles that have to undergo any inspection at all are vehicles registered in Metro-Atlanta counties. And the inspection for us (in Metro-Atlanta counties) is just an emissions inspection. If 750dblpump doesn't live in one of these counties, he will be fine.

Second, you won't be able to use just any "V-8" motor mounts with the 429. Make sure you get the frame mounts and motor mounts for a truck that was equipped with a 460. I'm pretty sure the truck will have to be an F250 or F350 from 87-97. As far as the C6 goes, you will probably need to get the transmission crossmember from one of these trucks also. I believe they were still putting C6s in in the early years of those trucks, but again, it needs to be a truck that came with a 460. You will probably have to use an aftermarket floor shifter.

Finally, you will probably need to shorten your driveshaft, since the C6 is a pretty long transmission.

In my opinion, I would go carbuereted since you have such a large choice of intake manifolds, cams, and heads available for the 385 series big blocks. Good luck whatever you do!

 

Thanks to everybody who has and will respond. I do live in an emissions county but the "out" is that the truck would become listed as a hot rod. as for the fuel pressure problem i found a pressure regulator at www.jegs.com that will allow me to use the stock pumps and a VERY pricey conversion kit at L&L products that looks to have everything needed for a conversion. If anyone has any more ideas or concerns please bring them up, I appreciate a direct, straight talk.
Thanks again to everyone