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Old 01-09-2010, 13:29   #1 (permalink)
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Question 351W Rebuild

Just doing some parts searching for a 351W rebuild for a 1990-93 Mustang LX 5.0L.

This will be my third time doing such a swap in Fox bodies, but its been some time since the last time. Anyway Im wondering about compression ratios and cam choice. I decided on a custom grind cam from Comp Cams with a 212/220 duration at .050 and 533/544 lift. This will be a retrofit roller cam using lifter parts from Comp. Anyway using pistons from Probe Industries, they have two choices. One is a dished 351W piston with a 15.9cc dish, while the other is a flat top with valve reliefs. Being the cam I will be using is for low to mid range performance with a lower duration, and this car is running EFI fuel injection with EECIV, what is the highest compression ratio EECIV can run with with a lower range cam? Is it in the 9s or can you go up to 10.3? I know a lot of motors today run close to 11s, but Im not sure how well EEC 4 can handle that, especially if the cam is rather mild. Any thoughts? Im trying to keep streetability with mileage as a concern, since my last 351W I was only getting 200km on a tank of gas with a midrange cam and flat-tops.

One last question. Do you have to use the 351W EFI fuel injector rails from the truck motor or can one use the ones off a 5.0L? And if I do use a 351W EFI fuel rail, will the ones off a 90s truck motor connect up to the existing feed line in 90-93 5.0L Mustangs? Im just concerned the fuel connector will be in a different position on the truck motors then the Mustang.
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Old 02-06-2010, 15:51   #2 (permalink)
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Re: 351W Rebuild

Funny. 171 lookers, but no responses. Wow guys.

Anyway I guess pushrod engines aren't as popular as they used to be here. I ended up making some changes to my parts selection. I'm getting a fuel rail from a 1989 Mustang 5.0L that had longer fuel hoses put onto them. Also the pistons I ended up picking were Probe 15.9cc dished ones. Compression will be 9.6 with 60cc AFR 185 heads. The cam will either be a Comp Cams 208/216 duration or a Crane one with the same specs. So I'm on the way to getting my parts list selection finalized. Should be cruizing within 2 years hopefully.
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Old 02-06-2010, 17:25   #3 (permalink)
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Re: 351W Rebuild

The guy that knows the engine stuff doesn't come here very often. When he does, he does help. Thanks for letting us know what you,ve done so far.
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Old 04-17-2010, 12:29   #4 (permalink)
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Lightbulb Re: 351W Rebuild

stick with the mustang rails as the truck connections are different local . remember cam overlap related to compression ratio... you look good. my 351 ran 9.4 to 1 with similar cam grind... crane 2030 known as the 444121compucam . I used 1.7 rockers. good luck
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