engine question
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engine question
I have a 91 F250 4X4 with a 351 engine and std trans. The engine had all smog equipment removed by the previous owner and now at 138K the engine is blowing oil out of the air cleaner. I am thinking about replacing the engine and I have a box of smog equipment that was removed but I don't know if any of it is any good or if it is even all there.
My question is what are my options for a replacement engine. I don't have to run the truck through emissions testing so that isn't to big of a problem but I don't know if having it removed is hurting anything.
Are there other engines that are better that will fit without to much modification, is there a different manifold that doesn't require all of the smog equipment? Can the 351 be built up with performance parts?
Thanks for any help
My question is what are my options for a replacement engine. I don't have to run the truck through emissions testing so that isn't to big of a problem but I don't know if having it removed is hurting anything.
Are there other engines that are better that will fit without to much modification, is there a different manifold that doesn't require all of the smog equipment? Can the 351 be built up with performance parts?
Thanks for any help
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Yea I know about cost, I did a cam, manifold, and headers on a 77 vette plus some other engine work.
I just wondered what others were doing to the stock engines. Has anyone switched to a carb setup.
The truck is a work truck so I don't need it to be fast I just wasn't sure about rebuilding or dropping in a crate engine and having a box of emissions parts that I am not sure work or are complete.
I do like strong engines so some performance mods wouldn't be out of the question.
I just wondered what others were doing to the stock engines. Has anyone switched to a carb setup.
The truck is a work truck so I don't need it to be fast I just wasn't sure about rebuilding or dropping in a crate engine and having a box of emissions parts that I am not sure work or are complete.
I do like strong engines so some performance mods wouldn't be out of the question.
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From: South Dakota
Well if you go to ford racing performance parts, they sell, 2, and 4 bbl 351 windsors, at a decent price, and if wanted more power starting with a brand new setup like this would leave your options open.
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Comp Cams has a cam that will work w/speed density EFI and the stock computer. Camshaft part number 35-255-5, cam grind number XE254H, duration @ .050 intake 210 Exhaust 214, valve lift w/1.6 rocker Intake .478 Exhaust .485. World Products makes the Roush 180 heads and Summit Racing carries them. They can be had assembled (cast iron) for around $1,000. Or you can have a machine shop work on your current heads. I would keep the EFI just for the fact that it is less money to spend. However if you want to convert to carburetion, it can be done. Headers are a nice asset on trucks.
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Originally Posted by fordbeast_80
Well if you go to ford racing performance parts, they sell, 2, and 4 bbl 351 windsors, at a decent price, and if wanted more power starting with a brand new setup like this would leave your options open.
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Originally Posted by mako5972
Comp Cams has a cam that will work w/speed density EFI and the stock computer. Camshaft part number 35-255-5, cam grind number XE254H, duration @ .050 intake 210 Exhaust 214, valve lift w/1.6 rocker Intake .478 Exhaust .485. World Products makes the Roush 180 heads and Summit Racing carries them. They can be had assembled (cast iron) for around $1,000. Or you can have a machine shop work on your current heads. I would keep the EFI just for the fact that it is less money to spend. However if you want to convert to carburetion, it can be done. Headers are a nice asset on trucks.
Thanks again
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The truck bogs down and chugs under acceleration, I have to let up some to smooth it out.
It is also blowing oil into the air cleaner which I think is from worn rings. This is my main reason for messing with the engine.
It is also blowing oil into the air cleaner which I think is from worn rings. This is my main reason for messing with the engine.
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From: Ocala, Florida
Maybe the previous owner stripped too much off and really messed up the the computer. If that is the case then it may be easier to switch to carburetion than to straighten the mess out. I have a Weiand Stealth Intake and a Holley Truck Avenger carburetor. I have a Comp Cams Xtreme 4x4 cam, roller rockers, Roush 180 heads, Jacobs Mileagemaster Ignition and headers for my truck.
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Yes, it is an F-250 4X4 w/standard transmission. The engine has to go to the machine shop for the rebuild. However, before I had it down I had the intake and 4bbl, headers and the Jacobs ignition. The Jacobs ignition really made a difference. It ran well, but needed more power. I let the truck sit for 2 months, went to start it and got a real surprize. The engine was full of rain water, and rusted stiff. All because of an aftermarket breather. It used quite a bit of oil, but I never saw any blue smoke, it did not leak it out, because I fixed the leaks.
The cam that I told you about, I believe that the guy's who run Lightning trucks call them " The hot rod cam. "
The cam that is going in the engine is similar to that cam. Duration @ .050 intake 210 Exhaust 218, valve lift w/1.6 rocker intake .477 exhaust .493. The cam is an rv or towing cam.
I figure with these mild modifications my engine will be as snappy as today's engines. I think it will make around 300 horse power.
The cam that I told you about, I believe that the guy's who run Lightning trucks call them " The hot rod cam. "
The cam that is going in the engine is similar to that cam. Duration @ .050 intake 210 Exhaust 218, valve lift w/1.6 rocker intake .477 exhaust .493. The cam is an rv or towing cam.
I figure with these mild modifications my engine will be as snappy as today's engines. I think it will make around 300 horse power.
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