which would make more power a 302 with new heads with a 63cc chamber and a mild cam or a stock mid 90's 351 roller?

I have a 302 with gt-40 heads on it and have a 9:5 comrpession ratio. and want to either put in a larger flat tappet cam

or just swap in a 351 and bolt on the gt-40 heads on it ?

which would make more power a 302 cammed and heads
or a 351 with just the heads ?

thinking about motor work for the winter

 

The 302 may make more peak horsepower at a higher rpm. But that's not much use in a heavy truck made to work. The 351w is a superior when installed in a truck but it may not win the numbers game.

 

Amen! As long as you stay with normally-aspirated engines, the old saying of "There is no replacement for displacement" is fairly accurate. A longer stroke gives more mechanical advantage, aka "leverage", resulting in more torque. And torque is what moves things, not horsepower.

 

ok. ive been doing alot of research about looking and turning a 96 351 over to a carb setup.

 

Something like an Eddy intake and carb plus a DS-II (blue grommet) ignition would be a good setup. In fact, the 1406 you have would be excellent.

 

I have not looked into specific dizzys yet but why do you suggest the blue grommet one. just wondering

 

The DuraSpark ignition box, which mounts on the fender, has the grommet - not the distributor. But, the distributor does need match the DS box.

There are several different DS boxes, and the color of the grommet where the wires come out tells which box it is. The box with a blue grommet is the standard one that does not require a computer. So you need a matching distributor and wiring harness and away you go. Your '82 may have the right stuff, but I doubt it as all the 82's I've been around had a tan or yellow grommet and a computer under the driver's seat. If yours is that way you'll have to source the stuff from an earlier truck.

 

so I thought by memory it was blue so I ran out there and snapped a photo. is this what your talking about ?

so from what you just said. I will not have to replace the computer but just a new matching dizzy.

 

Yes, that is what I was talking about. But, if that worked with your dizzy then you have a matched set. However, since the deck height on a 351W is higher than that of a 302 you may need a dizzy for a 351W - I just don't know that about the Windsor engines.

 

well I want to go with a roller so a new steel geared dizzy was already on the list.

 

Good point. And good plan. By the way, that DS-II box doesn't use a computer. So, if there's one under the driver's seat it isn't being used and can be removed.

 

no it does not. will a 351 just bolt on directly or does it need a different flywheel. just thinking about stuff that i might overlook but it seems like an easy build.

find a 351 strip it down to just the block, put my heads on it ( get them drilled to 1/2")
and an intake then slap on the dizzy and carb and should be good to go.

 

The 302 engines changed the inbalance of the flywheel after 1982. The 351w stayed the same (28 oz inbalance). So it's hard to say about the flywheels, I would guess you are going to need a new one.

You will need a new y-pipe for the exhaust if that's what you have, and different exhaust manifolds. The 351w is a wider engine, so even though the 302 exhaust will bolt to the heads, it doesn't work out right. If you have a dual system you might be able to make the old 302 system work.

When you find your 351w, I would go ahead and tear down the front and put a new timing chain and gears on it, and take the pan off and clean it out. If you get a 351 from a car you will need to get a rear sump pan and oil pump extension anyway.

 

what is the oil pump extension for ?

 

Ford engines are normally front sump. That's because the distributor is in the front, and it drives the oil pump which is in front. So the low part of the pan is in front. That won't work in these trucks, the crossmember is in the way. So they had to move the low part of the pan(the sump) to the rear. When they did that, they had to put a long pipe on the oil pump to go down to the rear to suck the oil up, that's the extension. There is also a special main bolt with a stud sticking out that supports this long pipe. You need that too. Any engine out of a truck or Bronco will already have this setup. I put a 351w in from a 79 Cougar, so I had to round up this stuff to make it work on my 1980 f150.

When converting a fuel injected engine you also need to check the eccentric that holds the large camshaft gear on. On the fuel injected engines this eccentric is there, but it's just one piece and they use it like a large washer. On the engines with a mechanical fuel pump, they had a two piece eccentric that would not wear out as quick. I would take the one off the 302 and put it on the fuel injected engine to reduce the wear on the fuel pump arm. Of course you will also probably swap timing covers so you can mount the fuel pump, unless you are going to use a electric pump.