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Old 02-09-2005, 07:04 AM
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Estimate HP

Ok, I'm building a 408, and was just wonder what you estiments were on the RWHP and at the flywheel, specs are as follows.

'69 351W block bore'd 4.030
4340 4" Crankshaft
4340 6.2" Rods
4340 Domed Pistons
10.0:1 Compression (tenative may change to anywhere between 9.5 to 11.0, still haven't deciced if I'm going with a blower in the near future or not)
Edelbrock Victor Jr. heads, 2.05/1.6
Flow 64/54@.100", 186/140@.300", 268/189@.500".
Edelbrock Performer RPM Air-Gap Intake
Edelbrock 800CFM Carb
1 7/8" Headers

Comp Cams 242/248 @ .050" .577/.600 Hydraulic Roller cam
1.6:1 Roller Rockers

Now I know it's enough to chew up the stock tranny, but was just wanting to get an outside estiment on HP.

Oh yeah, 4.11s and a T56 with top OD @ .6:1


Other things which won't really effect the HP:

Main Stud Girdle
All ARP fasteners

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Old 02-09-2005, 11:29 AM
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my hp guess

475 to 500 crank
400 to 435 rear wheel

Where does a 17 yr old get this kind of cash?
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Old 02-09-2005, 11:51 AM
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that will be a torky brute, I dont think your lookin at that kinda HP with that combo. Itll work best with more compression using that cam. Im thinkin itll be close to 500 Ft. lbs. of torque, but itll be all in by 5500 RPMs or so. Id consider a smaller carb, 670-700 cfm.
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Old 02-09-2005, 02:10 PM
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Holley

Holleys website calls for 700 cfm for a stock 400 and a 750 cfm for a built up 400. This motor has victor jr heads and a .577 roller.

I have a 400 with perf/rpm heads and a .500 flat tappet and I am pulling about 450 hp. If he can't get 475 out of that motor there is something wrong.
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Old 02-09-2005, 02:36 PM
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I just went to Holleys website, It says 650 CFM for mild(near stock) 400. I personally would use a 600 CFM on a 400 CI engine that stays within 5000 RPMs.
I dont see that combo making alot of RPM, so Id say 400-425 HP... but well over 450 ft. lbs. of torque
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Old 02-09-2005, 02:52 PM
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mild engine?

Victor Jr heads and a .577 roller is hardly mild.
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Old 02-09-2005, 03:02 PM
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Re: Holley

[QUOTE]Originally posted by bracketeer
[B]Holleys website calls for 700 cfm for a stock 400
YOU said this.
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Old 02-09-2005, 03:05 PM
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that was half the sentence

Quote:
Holleys website calls for 700 cfm for a stock 400 and a 750 cfm for a built up 400.
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Old 02-09-2005, 03:07 PM
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& I said I just read Holleys website & it says 650CFM for a stock(mild) 400. I say Id use 600 CFM for a stock 400 personaly. for this application Id consider 670-700 CFM.. I never said his combo was mild
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Old 02-10-2005, 05:51 AM
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Where a 17 year old gets the cash

I've been saving/investing for 4 years, got my mustang 2 years ago, did pretty much a full restoration inside & out, and finally decided to do the motor, got most of the engine stuff New but off of ebay (did get anthing used other than the intake), some of the stuff was a hell of alot cheaper then from most dealers, hell cheaper then some used stuff. The whole motor should *crosses fingers* be finished slightly under $4,000.

On another note when I replaced the head gaskets a year ago, I fully ported my heads with a dremel (a few drum sanding bits, some grinders, and 4 carbide burs) Had it pushing 300rwhp with just ported heads, a thin head gasket, and a full tune-up.
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Old 02-10-2005, 10:37 PM
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700 CFM

700 CFM is about right for a hydrolic lifter motor, but you will want to keep compression ratio down below 9.5 to 1 to use a blower later. Anything more than seven pounds boost will require much greater compression drop. Get mechanical secondaries for blower use.
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Old 02-11-2005, 05:20 PM
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cool

Quote:
I've been saving/investing for 4 years
That beats the hell out of pot and beers. I get a bigger and better high out of HP myself.

Got to give you credit in porting your own heads. Too many horror stories in that dept. I just buy aftermarket heads. Guess I'm chicken.
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