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Old 05-10-2011, 12:08 PM
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600 lbs torque 454??

I am wandering how hard will it be to acheave this with a 781 headed 454... Its going in my 82 c10

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Old 05-10-2011, 12:55 PM
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From another thread:

Quote:
A couple months ago, Car Craft did a test of a Demon Engines crate BBC 4-bolt 454 +0.030" (461 ci), Peanut Port heads (118cc chambers = 9.4:1 CR, stock valve sizes) w/a XE 268H Comp cam (.515"/.520" lift, 224/230 @0.050" duration on a 110 LSA), w/a Holley HP 750 carb and a (too-large) set of 2.25" headers.

It made 446 HP @ 4900 RPM/542 TQ @ 3600 RPM. 490 ft/lbs @ 2500 RPM. There's no doubt the numbers would've been better w/a smaller primary header diameter, IMO.

So, the PP heads are low RPM torquers, for sure. But not total dogs.

That said, the same engine, using a Edelbrock RPM Air Gap intake, Holley 950 HP carb, Comp XE284H cam and a set of Profiler 290cc aluminum heads made 564 HP @ 6100 RPM and 542 TQ @ 4900 RPM.

That's a gain of 118 HP over the smaller cam and heads. The 950 HP Holley doesn't flow anywhere near 950 CFM (said to flow less than a standard Holley 850) and the two intakes are basically the same as well (changed for a better port shape match), so the difference was mostly just the heads and cam.
Using a cam smaller than the 284 w/the 781 heads and a dual plane RPM-type intake and correct sized headers will get you there. The heads should be at least pocket ported and larger valves will help the peaks.
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Old 10-09-2013, 05:27 PM
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peanut port heads for the street

I totally agree, I think for the everyday street only guy it will give the best gas milage. I've read that even with the port mismatch at that power level, there is no problem with the mismatch. For saturday night fun in an early camaro, or truck for that matter is all I'd need to make me happy. This might be my next build project for old pickup truck.
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Old 10-09-2013, 05:39 PM
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You can't say 600hp and mileage in the same sentence!!
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Old 10-09-2013, 07:10 PM
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It says 600lbs, I'm assuming he means ftlb and that's pretty damn hard to do actually.
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Old 10-09-2013, 07:27 PM
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Sweet Build

Quote:
Originally Posted by cobalt327 View Post
From another thread:



Using a cam smaller than the 284 w/the 781 heads and a dual plane RPM-type intake and correct sized headers will get you there. The heads should be at least pocket ported and larger valves will help the peaks.
This is an example of a common sense built, real sweet engine, to power anything from a motorhome, boat, or a tire frying street car. Nolan
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Old 10-09-2013, 08:20 PM
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you would need a 650 plus horse power 454 to make 600 pounds/foot torque, or boost
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Old 10-10-2013, 07:01 AM
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454'S Nearly or Over 600 ft.lbs of torque

It doesn't take a 650 hp 454 to make 600 ft/lb of torque. Here are a bunch done by the same builder;

Chevy 454 - 475 hp Crate Engine Big Block Turn Key from Phoenix Engine

Grandma's 1970 Cadillac 472's and 500's made 525ft/lb and 550ft/lb respectively. These were engines so quiet and smooth you couldn't hear them running. These only made 375-400 hp;

http://www.crankshaftcoalition.com/w...gine_knowledge

Kenny, if you want to build big torque you have to think smaller with everything in the combo except CR. Nolan
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Old 10-10-2013, 07:19 AM
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600

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Originally Posted by OLNOLAN View Post
It doesn't take a 650 hp 454 to make 600 ft/lb of torque. Here are a bunch done by the same builder;

Chevy 454 - 475 hp Crate Engine Big Block Turn Key from Phoenix Engine

Grandma's 1970 Cadillac 472's and 500's made 525ft/lb and 550ft/lb respectively. These were engines so quiet and smooth you couldn't hear them running. These only made 375-400 hp;

http://www.crankshaftcoalition.com/w...gine_knowledge

Kenny, if you want to build big torque you have to think smaller with everything in the combo except CR. Nolan
527 HP(aluminum heads): from $6295 578 to 615 ft lbs torque
this was the first 600 pounds/foot torque engine in the list.
so a well tuned 530 horse power 454 could do this. I was comparing my combination of a 600 horse 540 I was aware of that made 640 pounds/ foot of torque
thanks for that info
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Old 10-10-2013, 10:48 AM
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I don't think you can compare a caddy to a 454.If memory serves me right,rod ratio's are all different and when you want torque that matters abunch.The caddy needs $$$$ aftermarket heads and still is limited in RPM where the 54 needs RPM.308 intake runners would do it for a 54 along with a matching cam to SCR's.
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Old 10-10-2013, 01:40 PM
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Not a BBC vs Cad.

Gary, I think you took my post out of context. The Grandma's Cadillac statement was merely used as an example to show that building big torque numbers can be achieved without big horsepower. Not BBC vs. Cadillac. Nolan
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Old 10-10-2013, 03:13 PM
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It's all good Nolan.Thanks for the clarification.
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