I'm looking to trade my mustang for an 05 f150 5.4 triton. The guy says he did a rebuild of trans and engine at 200,000 miles and when he did he says he bored it out to 5.6. However I can't find any any info on a striker kit or anything to bore it out to 5.6. If he did I assume it would be just a rebuild and not for performance but if so how much hp would something like that with a tune make? Thanks for the help

 

Greater displacement does not always equate into an increase of horsepower. There are many other factors involved. Sometimes you will lose HP and torque by making changes to base engine and it depends on how skilled the person who rebuilt the engine was as well. more friction being generated =lower hp and torque for example.

 

I dont know about modular rebuilds other then they are more complex and all but older engines tended to respond well to increased displacement. The 351 Cleveland for instance would gain quite a bit of power being stroked. I know the modular casting are thin walled so there is a real limit to how much boring can be done with compromising the blocks strength..

 

^what he said. When I built my 302 in my foxbody I bored it out to a 306 (.30 over stock), no stroke involed. I left everything else stock until I had all my parts that I ordered to finish the build. Now with the stock intake, injectors ect I felt like I didnt gain a single thing, may have but it was not noticable to me. After I put bigger injectors, roller valve train and all the pcs from the heads up I REALLY noticed big gains. Im not sure on exact numbers but to me if it was 5.4 and now a 5.6 im thinking he went .20 or even .30 over (I have always went by cubic inch not liter). I would never think about going that much on a modular motor, no way no how to risky. I would ask to see some receipts!! Lots of Bull shi**ers out there trying to sell stuff.

 

Yea, I wouldn't want anything to do with a bored out 5.4.

 

I too was concerned with boring it out another .2L being too much, but I don't know. That's about 12 ci gained.

 

A 351 @ .30 over becomes a 357 if I recall .12 CI would be a .50 over bore or something insane like that. No thanks.

 

Jeez, yeah, if that block has anything bigger than .20 over, I think its walls are going to be scary thin

 

Thanks for the advice guys. I haven't talked to him much about it yet because we are meeting to see it in a few days but going off the post it says everything is replaced
Also says 5.4 block bored .40 over. To a 5.6. Now I know looking at this forum it seems as if this is a complete no no but I was looking on corral and mmr had a stroker kit for the 5.4 3v to bring it to a 5.7 and they all spoke as if it was completely normal ? Any info on that kit?

 

Boring and stroking are 2 completely different processes.

 

I think you all mean .012,. 030 , .040, or .050. .50 is 1/2 of an inch (5 tenths, not 50 thousandths. Even .30 would probably mean that there was no longer be a cylinder wall in many places.

 

This is right.

Boring and stroking are two different things. Achieving .2L via boring and stroking might be okay, but by boring only, no. .040 over doesn't sound safe to me at all.

 

+1 ^ Again. Ask to see some receipts!!!! When and if I buy something and there has been work done to that item, really only if its internal work that you cant see I ask for receipts or some sort of proof. It seems petty but if there is no way he can prove the work was done then he is probably B.Sing you! I see it all the time

 

It would depend upon the engine. A 302 bored .040 over would end up about a 337 -340, which is very common. It all depends upon the thickness of the wall between cylinders, oil galleries, and coolant galleries.
The 5.8 in the 2013 GT500 is a bored out 5.4.

 

Cylinder sleeves would make it possible to bore out more but sleeving 8 cylinders would be pretty pricy.. I've heard of guys sleeving all 8 cylinders for a drag Cleavland. They also used to fill the blocks water jacket with a cement epoxy to strengthen them. Suppose all that could be possible with a mod motor.. Very expensive and with that done the engine would only be good for running down a 1/4 mile track.. Stroking might be easier but I havent heard of any kits. Pretty sure the GT500 got a special run block.