I have a 95 F150 V8 5.0
It was running rough and less power so I took it in for a diagnosis. The shop advised my compression is lower than spec. They recommended a new engine. Anyone else have this problem? Any suggestion how to fix other than a new engine? Also, I was thinking that if I end up replacing the engine to swap out the 5.0 for a 5.8 as I heard they run better than the 5.0. Any advice? is it possible to swap it for the 5.8? is is more headache than it is worth?

 

If you really do have low compression, the only real fix other than a motor replacement, is a motor rebuild.
Swapping to a 5.8 is doable and there are plenty of threads about it.

 

Put ALL its details into your signature as this page explains:

They're either dumb or lying. There is no spec for compression. The only spec is for the DIFFERENCE in compression between cylinders. Read this page:

I bet they did. Did they mention their price?What do you mean by "better"? They're capable of spraying gas out the tailpipe faster, but both can run perfectly like they did coming off the assembly line.Get a second opinion, or test compression yourself. It's not complicated, and doesn't require expensive equipment.It's possible to swap nearly ANY engine into a fullsize pickup - even a turboshaft.Probably, unless you've done the swap so many times that it's easy for you, and you REALLY enjoy the meager increase in hp & torque but higher weight & lower fuel economy of the slightly-larger engine.

 

Hi mongoose, my old 87 5.8 with lots of miles on it had one cylinder loading up on warm up/and when idling for a few minutes, so I did a compression check... 7cyls we're at 90 and the one loading up I presume was at 75 (valve problem I'd guess). Welp a friend told me about good ol boys using a product called "Restore"... After watching test online, I decided to give it a try... I'm here to tell ya that this stuff made all the difference in the world... No more loading up and it runs better than it ever has. I didn't do another compression check because it runs so good... It was mega bucks cheaper than a new engine so why not give it a try.. let me know if it works for you as good as it did for me... HAGOne
PS .. you might need a complete tuneup too...
Also check online how to clean injectors... Mines carbureted so I didn't have to worry about injector cleaning
https://duckduckgo.com/?q=restore+engine+treatment&t=brave&ia=web

 

That’s a little rich, Steve. Maybe OP got a few things mixed up in translation, but it’s not unreasonable at all for a 26-year old engine to be low on compression in any of those eight holes.

The mental math for a 5.0 with say a 9.0 compression ratio (9.0 x 14.7) should be around 130-135 PSI in each cylinder. Maybe it’s more, ideally, but don’t tell me he’s got a healthy engine if he’s running in the 90s on each cylinder.

Besides, let him have his fun with a 351 swap. Just the 50 ft/lbs of torque bump alone is worth it. Meager? Lol. That’s not a “drop in a cool air filter” warm fuzzies increase. Also, a 50# weight difference between engines...if it was that big a deal, Ford wouldn’t have popped 351s under the hood at the factory. Sigh.

 

Don't tell me your opinion about my opinion. That's not what the OP asked for, and it doesn't interest me. My opinion is what I post. Post your opinion about HIS situation. He can decide which one is warmest & fuzziest.