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Old 04-12-2008, 07:12 PM   #1 (permalink)
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stock 390 block HP capacity?

Just curious but does anyone know just how much HP and torque a stock 390 block can handle safely?
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Old 04-12-2008, 10:10 PM   #2 (permalink)
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Re: stock 390 block HP capacity?

I built a pretty racy one that made 550 HP at 6500 RPM, and I necer heard from the guy again.(428 crankshaft)

JOE SHERMAN RACING ENGINES
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Old 04-12-2008, 11:05 PM   #3 (permalink)
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Re: stock 390 block HP capacity?

I was hoping to get around 500+ horse out of mine. What kind of setup did you use with the 428 crank? Also what kind of heads did you use? if you dont mind me asking.
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Old 04-13-2008, 05:15 AM   #4 (permalink)
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Re: stock 390 block HP capacity?

You probably scarred him Joe when you built that 550hp. That's alot of power to handle. He's probably got a permanent smile for life...
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Old 04-13-2008, 08:38 AM   #5 (permalink)
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Re: stock 390 block HP capacity?

I used a fully ported set of cast iron heads and a pretty big solid roller cam. I am just getting started on a 428 stroker buildup for Hot Rod magazine. It is going to be 464 cubic inches,with Edelbrock heads that I am porting as we speak. I am looking for 600 plus Hp from this bigger version.I have a bunch of trick parts I am going to use in it.I do not know anything about the Ford engines, so I am learning as we go.

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Old 04-13-2008, 10:38 AM   #6 (permalink)
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Re: stock 390 block HP capacity?

To start a stock 390 block was rated at 375 hp with 6090-h heads mostly unless you had a gt 390 with gt heads I think was 6090-R .

You could add 6090-N heads which were 428 cj heads and a cj aluim intake with headers to boost a 390 pretty well . A stock 390 say 4 speed the tranny will not shift over 5000 for the clutch spring will not disengage to handle the rpms .

To get higher hp why would anyone goto trouble to build a motor stock with intentions of the motor having high hp without a strong bottom end ? All that is no good unless you use a good set of rods , say aries pistons and a stroker crank of choice .

If you going to the trouble to build a fe find a webbed 390 block or a 428 block . Those will hold up better and use a scat crank which is a cheaper stroker crank . Stroking a motor is a great way to get higher horse power for the money .

If going with a automatic you will need a stall converter , size depends on how strong your motor is going to be . You can get by with a 2800 stall pretty cheap .

Spped sho is building a motor for me to go into a 66 fairlane , 4 speed car . Never run a strong motor without useing a good scatter shield bellhousing as such lakewood . If the motor would exsplode that will keep your legs if it blew back into the car , I've seen a man loose his legs when motor blew .

My block is a 428 and still we x-rayed the weak side of block to sleave it to the weak side then line bored it . A good stroker crank , lamons rods , aries pistons ,apr bolts ,pinned bearings , better oiling cross drilled . Heads are by dove aluim but a good flowing cj head would do well . I use a tunnelwedge intake , hooker headers .

Depends on how much money you wish to spend , if limited buy parts and save them . When you get all good parts then have it put together . As for your question of an answer , around 375 to 400 is what you will get out of a stock 390 . Start additives on top the stock block willnot handle the increase hp without a good bottom end . All is about how much money you can spend but mostly finding great deals on parts , they are out there .
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Old 04-13-2008, 05:01 PM   #7 (permalink)
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Re: stock 390 block HP capacity?

Ever seen Charlie Booze's 1962 Ford Galaxie??
He's got a high winding 427 based Tunnel Port and a trick Liberty 4 speed.
Its a 3500+ lb. car that rides the back tires and runs mid 8's in the quarter mile...all motor!!

Of course that has nothing to do with a 390
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Old 04-13-2008, 06:56 PM   #8 (permalink)
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Re: stock 390 block HP capacity?

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Originally Posted by TorinoStyle2 View Post
Ever seen Charlie Booze's 1962 Ford Galaxie??
He's got a high winding 427 based Tunnel Port and a trick Liberty 4 speed.
Its a 3500+ lb. car that rides the back tires and runs mid 8's in the quarter mile...all motor!!

Of course that has nothing to do with a 390
Charlie and Brian Booze's 62 galaxie (Pale Rider)is a all out race motor with around $50,000 in that 427 . BBR Performance : Street, Drag, Oval Track speed products
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Old 04-13-2008, 07:04 PM   #9 (permalink)
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Re: stock 390 block HP capacity?

Yeah, that's definitely not a everyday or weekend warrior motor to drive on the street.
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Old 04-13-2008, 09:24 PM   #10 (permalink)
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Re: stock 390 block HP capacity?

Thanks for the replies.
I was just wondering if I should put a better bottom end in my 390 or start fresh with another block, say a 428 or so. Money being a concern I was hoping to stick with my 390 and try to get 500+ horses out of it.
Right now its just a rebuilt original with stock heads and a performer intake and cam.
I've seen a lot of guys have luck with a SCAT crank but I've seen a lot of them break. They seem to lighten their cranks up too much in my opinion. but then again the ones ive seen break were in a Chevy haha.
Just bouncing some ideas off you guys so I can make up my mind. My 62 Galaxie is a heavy car and I'm almost done with my dad's 68 mustang, so I cant let his be faster than mine
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Old 04-13-2008, 09:39 PM   #11 (permalink)
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Re: stock 390 block HP capacity?

If you have a choice I would start out with the 428 block..The more cubes the better for a heavy car like a galaxie..Get a shop that is familiar with building an FEs so they can do the bottom end correctly and get the oiling right...When I was a teenager I used to have a pile of FE blocks with holes in the sides of them!
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Old 01-08-2013, 10:44 AM   #12 (permalink)
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Re: stock 390 block HP capacity?

I was thinking about building an EFI turbo 390... any recommendations on most hp i should push through it.

I know the 427 is a 4 bolt main block but is the 390?

i was thinking some 9:1 pistons with survival machined blue thunder heads and a mild hydro roller cam with twin 70mm turbos and Big Stuff 3 ECU.
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Old 01-08-2013, 10:53 AM   #13 (permalink)
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Re: stock 390 block HP capacity?

Quote:
Originally Posted by sumfoo1 View Post

I know the 427 is a 4 bolt main block but is the 390?
No,
Quote:

i was thinking some 9:1 pistons with survival machined blue thunder heads and a mild hydro roller cam with twin 70mm turbos and Big Stuff 3 ECU.

Should make good power but the bottom will need help, depending on boost levels... ie good crank/rods
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Old 01-08-2013, 10:58 AM   #14 (permalink)
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Re: stock 390 block HP capacity?

this sucks... i just had a 427 block too and gave it to my cousins for a project they sold... need to figure out how to get it back...

@ what power levels should i start to be nervous about the 390 block should i try to get my 427 back ?

Forged crank and oliver rods would be the plan for that part of the engine.
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