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Author Topic:   Ford 393 HP? RPM?
oluf
Dirt Full Roller

Total posts: 30
posted February 21, 2005 03:33 PM  
I'm putting together a 393 ford. E3 block,motorsport cast crank, motorsport sportsman rods,probe flat tops,11.3to1 on alcohol, n351 heads,.590/.590 & 250/255ish @.050 cam, I'm expecting around 550 hp?, 6500 rpm.Am I in the ballpark here? Wondering if this will live and at what rpm.
Also, would a victor jr. intake be a good choice for this.

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted February 21, 2005 04:18 PM  
550hp sounds about right. i had a similiar combination a couple of years ago.....never could get it hooked up good. victor jr. is perfect for it.

keep it around 6500 and it will last all season...

did you find a set of heads? i might separate my "n" headed 351w, roller cam, lifters, etc. email me if you're interested...

outlawstock17@cox.net

oluf
Dirt Full Roller

Total posts: 30
posted February 21, 2005 04:27 PM  
outlawstock17 Thanks for the reply, I did find some heads. after reading all the ford archives on here I'm wondering if I should have gone with a 347 though. I guess if I can't hook up the 393 I can put it in my street car!

akadirtracer7
Dirt Freak

Total posts: 217
posted February 28, 2005 07:54 PM  
I,ve been runnin a 347 and I'm building a 408 and we'll see what happens.Everybody tells me they make good torque and the long rod is going to rip the block apart .ford 5 said he's put many 408 s together and no problems outlaw you sound like you've build plenty combos and have not had problems.I'm not building an all out motor so I think it'll be just fine around 500-550 hp .Towers and Harwood said keep it 4000-7000 and it might last the season .He said he'd seen a mod rip the block hot lapping it .(could have been a bad block to begin with). I'll be running it in a limited late model chassis with 11" tires .My buddies been running the 393 and have'nt had problems with them either.When people keep telling me the block won't hold up I keep wondering how the cup boy used to do it when there were'nt any racing blocks to use.I think it will hold up to my build.

Raz_900
Dirt Forum Champ
Total posts: 635
posted February 28, 2005 10:14 PM  
Depending on the track, you might be better off slightly revising your thoughts.

If traction is a problem, run a long rod 351. A 6.5" rod (351M, a dime a dozen throw ARP bolts in them and call it a day) will fit without much problem.

That cam's a little on the big side for 11.3:1 and 6500 rpm. I'd back it off 5-8 degrees. Or, if you have to run that cam cause you already have it, plan on turning 7000 rpm.

My choices would be...

sticky track, 393 with a 245-248 cam and a Edlebrock Performer Rpm turning 6500.

slippery track, 351 with the cam you mention and the Victor Jr turning 7000. The bigger cam and smaller CID won't blow the tires off coming out of the turn.

But that's just my thoughts. Might be better off running gas too.. Alky needs the compression to be up there to work to it's full potential. 11.3 is low for an Alky motor.

[This message has been edited by Raz_900 (edited February 28, 2005).]

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted March 01, 2005 08:56 AM  
quote:
Originally posted by Raz_900:

sticky track, 393 with a 245-248 cam and a Edlebrock Performer Rpm turning 6500.

slippery track, 351 with the cam you mention and the Victor Jr turning 7000. The bigger cam and smaller CID won't blow the tires off coming out of the turn.


the larger engine with the same cam will make its peak power at a lower rpm and require the extra airflow of a single plane intake manifold. you don't want to use a "big torque" cam in a 393. it will be tough enough to hook it up with a big cam. with good heads, a 393 has a lot of grunt. a bigger cam will soften it up on the bottom and help get it hooked up.


ford5
Dirt Forum Champ
Total posts: 711
posted March 01, 2005 04:39 PM  
Outlawstock17 is correct.

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