Another try 351w in 94 simply

My recommendation...sell the truck and 5.8L.

Buy refurbished 5.0L shortblock for $699+s/h from Late Model Restoration or some place similar.

1979-95 Mustang 5.0L 302 Economy Short Block, Accepts Roller Cam at LRS - Same Day Shipping!

Buy engine overhaul gasket kit and transfer everything from stock engine to refurb'd short block.

Way less money and time in the grand scheme.


Otherwise you will need;
1. exhaust mods (headers, mid-pipe extended or replaced, etc.)
2. computer needs to at least know new displacement (need to get tune for the ECM)
3. does the 5.8L's distributor have a remote mount TFI module...if so ok...if not then need to rewire or get new dizzy
4. you'll need the oil pan / pickup kit. FRPP has a kit.
5. need to find 5.8L GT40 lower intake to work with your Cobra upper intake. Or get expensive $$$$$ aftermarket intake.
6. do you need to be emmissions compliant? If so the EGR tube to passenger side header will need extending and the crossover pipe on the back of the heads will need extending as well.
7. what camshaft is in it? Most likely you got the 5.8L from a truck or van. Neither's camshaft is ideal for a car.

I've put some thought into going the 5.8L route myself and this is just what I could think of off the top of my head. It can be done. But, it isn't going to be quick, easy or cheap.

JJ95GTID said:

Otherwise you will need;
1. exhaust mods (headers, mid-pipe extended or replaced, etc.)
2. computer needs to at least know new displacement (need to get tune for the ECM)
3. does the 5.8L's distributor have a remote mount TFI module...if so ok...if not then need to rewire or get new dizzy
4. you'll need the oil pan / pickup kit. FRPP has a kit.
5. need to find 5.8L GT40 lower intake to work with your Cobra upper intake. Or get expensive $$$$$ aftermarket intake.
6. do you need to be emmissions compliant? If so the EGR tube to passenger side header will need extending and the crossover pipe on the back of the heads will need extending as well.
7. what camshaft is in it? Most likely you got the 5.8L from a truck or van. Neither's camshaft is ideal for a car.

I've put some thought into going the 5.8L route myself and this is just what I could think of off the top of my head. It can be done. But, it isn't going to be quick, easy or cheap.

Click to expand...

2. Stock Cobra ECU should be fine as long as the MAF/Inj are matched. With a stock 351, the Cobra's 24# injectors should be fine. Of course a tune is recommended but probably not required at this point.

3. The 96 351 should have the correct distributor for our cars. I used one from a 96 F-150 in my car.

The rest of the list looks good.

You need 351 balancer and flywheel.

94-95 front accessories will bolt up, just need a longer belt. May need to swap the timing cover and water pump as well.

If you use the Mustang fuel rails, you'll need to extend the hoses between the two rails

I would swap the cam and rockers from your Cobra into the 351 for now. Also, if the 351 has e7 heads you should swap the gt40's from your Cobra onto it. That will essentially give you a stock 95 Cobra R.

I think they pretty much nailed it. I was going to go that route but it was more work than I wanted to do at the time (still drove the car several times a week back then). If youre looking for something quick and easy to drop in, a 351 isnt the first thing on that list. Just out of curiosity, how many miles were on the Cobras ticker to get it to the shape yours sounds like its in? Ever consider rebuilding the motor out of it, might be less of a headache.

The Cobra's short block is the same as the GT's.
It is the GT40 iron heads and Cobra(GT40) intake, camshaft, 1.7 roller rockers and a few other misc. items that make the Cobra engine a better performer.