I'm trying to find a 347 SBF crate motor for a customers car to replace his 5.0. We want to go crate because of the warrenty that most come with. The catch is that it will get a supercharger, and all the 347s I've seen have to much compression, and there all in the $7,000 range(while hi-po 302s are only $3Kish). Thanks for the help.
Ford's SVO dept is always in the books pitching these...Id just try the local Ford dealer for a quote.....
Coast High Performance is one of the original outfits to create the 347's. They build a really nice piece. http://www.coasthigh.com/Assemblies/Crate_Motors/347_cobra_classic.htm
i bought a 430 hp ford (351) 393 inch crate aluminum head deal for a pantera and it is unreal fast. bought it from ford svo dept at dealership and it was 4800 dollars intake to pan. I had to put a pan on it as the one that comes with it is mearly a cover . good luck
SVO crates are all 9:1 or higher. they also want an extra 3 grand for the 347 over the 302 and the only real difference is the crank, rods, and pistons.
Whoever you decide to go with, you would be wise to open a dialogue with them and let them build an engine specifically for your supercharger plans. I don't know any builder that would stand behind an engine if they didn't build it knowing it would be boosted. You might even save some cash buying a package.
I don't think you want to add any kind of power adder to a stroked 302. Especially with a stock block. I used to frequent a Ford message board with a lot of fast cars, and that was the consensus. The 302 can handle power adders, it just get hairy when you stroke them as well. Just something to think about and look into. The 351w based motors have a stronger block with thicker webbing and 1/2" head bolts. That cant be much different in size than a Y-block, why not go that route? Then you can have a blown 392. Or, you can just go all out with the money: http://www.roushperformance.com/engines.shtml .
I've heard the oil problems come from certain pistons that have the lower ring overlapping the pin cutouts. There is at least one manufacturer (though I don't know who) that makes them without the interference. Again, this is info gathered from other forums, so I can't personally back it up. I think CHP was one of the good places to go to. DSS would have to be good cause they're dang pricey. I agree that for the price,a 392-3 would rock, but there's other things that don't line up quite right when switching from a 302. J
first off im a mustang freak......i have 20 or so from a 64 &1/2 to a 07 and two race cars i have a 331 in one and a 347 in one. both motors are super strong i cant tell the difference . on paper a 347 has *&^%$ amount more torque at 3000rpm and a 331 has *&^%$# more hp at 3000 rpm. but a 347 has whats called a bad piston to rod relationship thats where the (oil problem) comes from.B.B.T RACEING.COM. they are good guys they are at the top of the nmra and they have a dss or sportsman block347 and a 60-70mm turbo on it .they can build u a 347 that will hold. for cheaper than 7k. just pm me ill tell you my race name and can get u a discount. it just like the hamb we take care of each other. my 64 347 and these are my others i know OCD im getin help .....the bad part thats not all of them .i didnt have room in my printer .(notice how i did them together)
Talk to the guys at Coast High. My son's 408 is a torque monster and since he hasn't torn it up yet, that's testimony that they make a good products.
If you want a true 5.0 blower motor with a warranty your not going to find it in crate form for a cheap price. There are too many variables to take into account during the build to offer one over the counter....let alone one with a warranty. Your most likely looking at a custom built motor (with the engine builder very likely to insist in installing and dyno tuning motor with the supercharger and fuel/ignition systems installed) and most likely one without a warranty considering your running a supercharger. We've built many SBF stroker motors. If ultimate normally aspirated HP/torque is the goal then its hard to beat the cubes the 347 offers. There are some rod angularity issues if your going to rev the motor hard but the oil control problems the early 347s experienced have been addressed. If your going to boost the motor and/or rev the snot out of it the 331 inch motor with a custom blower/turbo piston is a much better choice for longevity. 7000+RPM isn't an issue for these at all with the right parts and assembly techniques. As far as blocks and ultimate longevity (especially since your trying to stand behind the product with some sort of warranty) are concerned your good to about 450hp/7000RPM on a fully deburred and prepped stock block utilizing main and head studs and a main girdle.......yes, there are MANY stock block 302/5.0 motors out there running much more power but they aren't typically expected to live long lives. If your looking for 500+ reliable HP with a supercharged application it would be VERY wise to choose an aftermarket block with high quality internals and supporting hardware. $7000 dollars sounds like a good ballpark figure to start at depending on block, rotating assembly and head choice. Good luck with it. -Bigchief.
Thanks for all teh input. We're probably going to stick with the 5.0 because the customer likes his money to much to spend that much of it. The current motor feels like it is barly pushing out 300 HP on boost, as the trained monkeys that put it together for him threw such a mixmatch of "comes with a sticker" parts on it that they don't work well together. I've repeadedly said that a well built NA 302 can easily make more power than this thing does, but then he whines because he already bought the supercharger for it(a Powerdyne BTW ,it came with a sticker...). We looged at the 351 based stuff, but it's more money than he wants to spend to make the 5.0 parts line up correctly.
oh one more thing just in case u want you can find a 86-92 or 89-92 cant remember ex ford explorer it has different heads(gt40)and intake, cam and forged pistons ...more torque and holds a power adder verry well. or nos. you can order it from ford and tell them that its a race motor most people think torque is hp. and they will be happier than a fag with a bag of dicks
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