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Old 10-06-2007, 15:28   #1 (permalink)
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horsepower guesstimation

i just wanted to see if anyone could give me a rough idea on how much power i will be getting from my 460. Parts and things ive done so far:

*Weiand stelth inlet manifold
*Comp cams XE274H cam
*Roller Rockers
*Tri Y headers (i know not the best option but @ the collector i have it flared and 3in flanges fitted, plus they cost me nothing!)
*Dual 3in exhaust with hooker mufflers ending at the diff
*2in super sucker carby spacer
*850cfm carb
*C6 auto with shift kit
*9in with (so im told) 3:25.1 gears
*doing general portwork to the heads, mainly exhaust work and just a light tidy inside the inlets
*MSD in 6AL with MSD dizzy and 50000volt coil

Just a general idea would be great
cheers
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Old 10-07-2007, 22:38   #2 (permalink)
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cool Re: horsepower guesstimation

You left out two very important facotrs: heads and compression ratio.

Assuming ported D3VE heads and flat top pistons, I'd guess that you're looking at a good 425 hp.

I wonder if the 3-inch exhaust tubing is so big that it hurts your engine's performance, particularly on the lower pm range.

Paul
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Old 10-10-2007, 04:49   #3 (permalink)
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Re: horsepower guesstimation

sorry paul

my heads are 92cc versions, think you mentioned in another post they D9VE heads? will be using flat top pistons (when some are available in aus, not easy to get here)

talking to my engine builder soon, may shave the head a little and hopefully get the compression a little higher, 9.5-10:1 would be ideal.

How much can i shave off the head without having to get custom pushrods made and to achive the higher comp ratio?
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Old 10-10-2007, 12:04   #4 (permalink)
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cool Re: horsepower guesstimation

With that cam and roller rockers, you will need special length pushrods anyway. Also the D3VE heads require a special pedestal mount roller rocker available from Harland Sharp and Ford Racing only, so be sure to get the correct type (unless you are converting your D3VE heads to stud rockers).

Your heads are 95-97 ccs. Shave them to 90 cc's and zero-deck your block to the flat top pistons, and you will get 10:1 c/r.

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Old 10-11-2007, 01:29   #5 (permalink)
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Re: horsepower guesstimation

the roller rockers i have are stud type and came in a kit thats readily available here. they are 1.73 ratio.

I will get the block and heads shaved and hope that being 10:1cr on our premium unleaded fuel here (98 octane usually, places like sydney etc have a 100octane available!) so hoping no pinging or detonation wil occur
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