92 5.0 to 393W swap

92_Fox5.0 said:

I am fairly new to this forum, and I have read through all the threads, but I havent seen anything regarding 351W conversions. I am contemplating a 351W based Coast High Performance 393 Short Block build up for my 92 LX. I need some parts recommendations as well as some feedback regarding this possible project. This project will be a long standing one if attempted and I would appreciate the help. My goal will be to have an emissions legal 393 with 450-500HP at the flywheel upon completion with the use of the following components: Edelbrock Performer Base Manifold (for 351W swaps) with Performer RPM 5.0 Upper Plenum, World Products Roush 200 cast iron Cylinder Heads, and Edelbrock 75mm Throttle Body with EGR spacer. Plus if this build up is even possible, can anyone help me out with cam selection? I want something with a real lopey idle, but that will work with a blower if I should decide to use one.

Click to expand...

I came on here looking for the 351W swap sticky at the top of the forums and its gone, any links to it are dead. Its missing! :damnit:

I think you'll find those heads and a 5.0 based intake will severly restrict a 393w. Anyway, the major things to make it work will be an oil pan, headers, accessory brackets, and maybe a hood. I'm sure there are other things, like a fuel rail because of the 351w wider lower intake. This all based on common readings.

I plan on building a 393w myself. EFI Spyder intake, AFR 205's or 225's, and a custom cam along with some 1 3/4" long tube headers, big TB and MAF, etc. etc. A cam selection for you will be tough, because with boost you want a wide LSA which slightly tames the lopey idle.

There should be tons of info on the 351 swap around here, as it would be the same as a 351 stroker. Oil pan, intake, headers, and some tinkering with the accessory brackets are all I have found. I have a 351 block in the garage for this, but I am leaning to a 347.

Shouldnt be hard, although meeting emissions may take some cam and tuning thought.

92_Fox5.0 said:

I am fairly new to this forum, and I have read through all the threads, but I havent seen anything regarding 351W conversions. I am contemplating a 351W based Coast High Performance 393 Short Block build up for my 92 LX. I need some parts recommendations as well as some feedback regarding this possible project. This project will be a long standing one if attempted and I would appreciate the help. My goal will be to have an emissions legal 393 with 450-500HP at the flywheel upon completion with the use of the following components: Edelbrock Performer Base Manifold (for 351W swaps) with Performer RPM 5.0 Upper Plenum, World Products Roush 200 cast iron Cylinder Heads, and Edelbrock 75mm Throttle Body with EGR spacer. Plus if this build up is even possible, can anyone help me out with cam selection? I want something with a real lopey idle, but that will work with a blower if I should decide to use one.

Click to expand...

First off welcome to the forum.

We did have a sticky with all of the info you could ever want, but it went missing a little while ago.
I am not familiar with the intake you mentioned, but all of the 302 uppers will be incredibly restrictive to the upper rpms. Look into some of the box uppers that will bolt up to various lowers. I am using the comp cams upper on the lightning lower. My cam is 230/236 @ .050 and .513/.526 lift on a 112 lsa with 1.6rr. I am happy with the idle quality but am unsure if I will pass emissions yet. Generally speaking the lopier the idle (which is due to valve overlap) the tougher it will be to meet emeissions standards, especially the idle portion.

The fuel rails from the 302 can be used if you cut out the stock hose and replace it with longer hose. I had to bend the nipples a little to get the hose to clear the lower manifold, but it did work very well. Be sure to use hose clamps and HIGH pressure fuel line. Beware of vac line for this application.

I have been through the 351w swap, so feel free to pm me or repost if you have any specific questions.

good luck
jason

Let's see if I can summarize this

Use vert motor mounts, stronger & lower

302 front access fit on the 351 block, you just need the Ford PS/AC bracket adapter

351 swap oil pan & pickup, although I imagine you'll want more than a 5 quart pan which is all that Ford makes

IF you keep the smog air inject tube, cut it in the straight portion behind the intake and lengthen with a 6" piece of hi temp silicone 3/4 heater hose

You might need larger fuel rails than stock to feed it, but if you use 302 stock rails, cut the hoses off and replace with specific hi pressure fuel injection hose, and efi hose clamps - rolled edges so they don't cut the hose. NAPA & others have those.

You'll probly need a higher cap radiator, Pep Boys & others have a good quality GDI (GoDan) 3 row brass that cools very well and is reasonably priced.
I also recommend a hi perf water pump (I used a Weiand) and esp. a hi perf hi flow thermostat - that keeps the engine temp much more even.

351 EEC_IV distrib out of a later 351 light truck. Take it to a good auto machine shop and have them swap on the Ford yellow stripe roller cam gear if you're going roller cam. TOUGH to do in the garage and get it right.

Recommend a heavy duty oil pump drive shaft.

351 swap headers

28oz flywheel or flexplate
Mid 90's light trucks had 351's w/4R70W's - same
flexplate as for AOD/E
You can get them new for $50 most auto parts

If you're auto, you might want to check this out - I'm in the process now

http://www.lincolnsonline.com/article80.html

And this REALLY helps working with exhaust
http://www.lincolnsonline.com/article91.html

When I did mine, it raised the
alternator, so devised a way to route the top radiator hose around it to the outside and behind as it interfered w/the hood. There is a pic in this link
http://www.lincolnsonline.com/article93.html I cut the radiator end off another top hose and spliced w/exhaust tubing.

www.alternativeauto.com has an article in the water box archives w/all the Ford part #'s

Enjoy and Good Luck!!

macxx1@excite.com if you have any questions I may be able to answer

A few comments on the excellent post by macx.

Be careful with lowering mounts if you use an aftermarket pan. I have clearance issues between the pan and K-member with a Canton pan and stock 302 mounts.

The 50oz flywheel can be rebalanced to 28 by most balance shops. It set me back about 75 I think.

For a stock to mild type 351 swap I think most of the 302 cooling components would be fine. But, with the addition of power comes more heat. Strokers with h/c/i definitely need extra capacity.

One other thing. Most people get a aftermarket hood for clearance, or use drop mounts. I ended up machining down the comp cams upper intake to clear the stock hood.

i've got $ hit load of 351w swap info. even bought the ebay "351w swap ebook" which should have been free because its same info found online. with my luck if i posted w/o sourcing it i'd get sued. so here are a few 351w swap and build up links.
http://www.svtcobraltd.com/351Swap.htm
http://www.mustang50magazine.com/techarticles/18818/
http://www.fordmuscle.com/phpBB/
http://www.carcraft.com/techarticles/116_9507_wind/index.html

i made a pretty through 351w shopping list going to a roller hydrallic for my '69 351w. remember this is what i needed because i have to redo everything. my block was unopended org and am going to a 408 stroker. It may be slightly diff from your setup choice. By the way im not running AC, i live in rainy WA. hope this helps

130 amp alternator (upgrade not req)
alternator bracket
ac bracket (use stock pump)
bolt set - heavy duty
cam bearings
camshaft - roller hydrallic
carburetor - 4v 750cmf
crankshaft (4.00" 408strocker) (3.850 393stroker)
crank pulley spacer
damper 28 oz
damper bolts
distributor - msd
distributor - steel gear, not bronze or iron
flywheel 157 tooth/flexplate
flywheel bolts
freeze plugs
fuel pressure regulator/adjustable
fuel pump/high vol
gasket set complete - fel pro high perf
head bolts/arp
heads/ported
ignition coil/high perf
ignition box/msd
intake manifold/victor jr.
lifters/hydrallic camshaft used stock 302
main bearings
main cap studs/apr for rods
motor mount/solid heavy duty
oil pan/7 qtr
oil pickup
oil pump/high vol
oil pumpdrive shaft/heavy duty
piston rings
pistons/forged
plug wires
power steering bracket (use stock pump)
push rods/for vavles
retrofit roller lifter kit/to run hyd roller
rod bearings
rods/h-beam forged
roller rocker studs/apr screw types
roller rockers/aluminum
serpentine pulley set (you should be able to use stock pumps)
spark plugs
starter/mini high torque
timing chain/double row 3 piece
valve covers
valve guides
valve springs/high perf
valves/high perf.
water neck
water pump/heavy duty

my 351w swap input
http://forums.stangnet.com/showthread.php?t=580195

92_Fox5.0 said:

Do you still think that even with the porting/honing this combination will be too restrictive for the engine?

Secondly, If I should decide to go with the recommended lightning lower/comp cams upper set up could I still use the Roush heads? These heads are one of the best cast iron heads on the market, I dont want to use aluminum, and they are emissions legal.

Click to expand...

Why are you avoiding Al heads?

Even with porting and honing, there will be a performance advantage to dercreasing the runner length on a large stroker. The 302 needs the help with low end torque, which is why there are so many long tube intakes out there. The runner length will limit the top end, and the low end of a stroker won't be lacking for torque.

Click Here. This is where the comp cams upper intake should be. The page didn't work right when I was just there though.

The lower I had to get from Ford. Thumb through some of the mag advertisements to get an idea of who has decent prices. I don't remember where I bought mine, it was too long ago. They can vary quite a bit from dealer to dealer.
I originally wanted the 351w Cobra manifold (upper and lower), but it was seriously back ordered at the time. I think I heard something about these being dicontinued though, not sure.