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Old 05-10-2012, 02:23 PM
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327 HP estimates please?

327 large journal
RPM intake edelbrock
670 holley vac secondaries
shorty headers
291 fuelie heads 64cc chambers ported and polished 2.02s valvesAdvertised Duration (Int/Exh): 262/268
Duration @ .050 (Int/Exh): 219/227
Gross Valve Lift (Int/Exh): .468/.489
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd Lunati voodoo
3.73 rear gears with a th350 3000 stall converter

Am I looking at 1hp per CID? Any help would be great thanks!

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Old 05-10-2012, 03:37 PM
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What's the compression ratio?
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Old 05-10-2012, 04:26 PM
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10-10 1/4:1
dynamic CR 7.92:1
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Old 05-10-2012, 06:59 PM
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The shorty headers, heads, and tiny cam are hurting power. I would guess about 300hp.

The pistons would require a good size dome to make it into the 10:1cr range with a 327 and 64cc heads.

Besides, 10:1 cr is too much to run a cam that small with pump gas and with the correct ignition timing.

Why a small cam like that with a 3000 stall, 3.73 gears, and 10:1 cr? Put in a cam with around 280 degrees of duration and make 350hp. And close to 400hp with a better set of heads and long tube headers.
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Old 05-10-2012, 07:11 PM
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Making certain "assumptions" (gasket thickness, valve reliefs, etc.), my simulator puts static compression at 9.21:1. That's a 4.03" bore, 3.25" stroke, 64 CC chamber, .040" thick gasket (nominal), 6 CCs in the reliefs (flat tops), and .020" deck clearance. Those are typical of a "stocker" rebuild 327. I "guestimated" the flow efficiency based on the "ported" comment. A stock 291 is in my database, so I enhanced it a few points. Added the 2.02s, too. Assumed it's still a 1.5" exhaust.

With that cam at those centerlines, dynamic compression is 6.59:1. If I reverse the centerlines to be more "in line" with where most cams are ground (108 intake, 112 exhaust for an LSA of 110), dynamic compression increases to 6.85. If those parameters were transposed, this would be the result.

The program is Performance Trends Engine Analyzer 3.4 "Pro". We've found it to be a useful tool in developement. It usually gets HP within about 5-7%. Depending on the engine family, it can get torque pretty close, or be out to lunch... It can't allow for variations in port configurations. It gets the small block pretty close, but a Pontiac or big Ford throws it for a loop... The Pontiacs have made more torque than predicted and the Fords, less (venturi port versus round port). Where it really has proven valuable is in evaluating changes. The percentage of gain and loss has been very accurate based on actual dyno and track samples. The program assumes "perfect" air and fuel.

Results are peak HP 327@ 5,500 and peak torque 351 lb. ft. @ 4,000. Torque is strong, over 300 just beyond 5,000. HP nose-dives after 6,000 (313). Estimated vacuum at idle (another parameter proven to be pretty accurate) is 13". Not bad for a big valve and short stroke. Enough for power brakes, anyway. IMO, full-length headers (good ones) would easily push it over your 1:1 "line". With 327 HP and 331 CID, you're JUST shy...

FWIW

Jim
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Old 05-11-2012, 10:59 AM
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Old 05-11-2012, 08:28 PM
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1.21 giga-watts???!!!!
 
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Boy, I just love this "tiny" cam baloney. Evidently, anything under .600 lift and 300 duration is just inadequate.

OP, let's use the word "sensible" for your particular cam. That's a nice little engine and from your statement, you were looking for 1 HP per cube and you got it. Nice job.
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Old 05-12-2012, 05:57 AM
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It's not baloney. Its a mismatch in parts.

Why run a 3000 stall converter, a 3.73 gear, and 10:1 cr with a tiny rv type cam? A valid question and an obvious mismatch.

Relax, I'm not recommending a .600 lift cam. Just a cam that matches the stuff the owner already has. Plus he seems to concerned about making HP not toque.

Nothing wrong with running a tiny cam, but not if you are concerned about making 1 hp per cubic inch.

Just because dyno software says 1hp/inch doesn't mean it is true. Those heads and shorty exhaust headers would prevent that in my opinion. Maybe possible to make that power with a cam that size if full length headers and better heads were used.

Sure it is a nice engine, but accept it for what it is.
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Old 05-13-2012, 01:18 AM
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327 Mouse

compression is with 64cc 291 heads with flat tops so it could be a little lower then 10:1 could be around 9.6:1 I guess. I am just trying to get a ball park figure on hp and torque, the trans builder who fudged my th350(had to rebuilt) said it was a 2000 stall converter but my local tranny guy said it is closer to a 3000 stall. I am pretty darn happy with how it runs now. I did have a team g intake on there before but bottom end was to soggy, now with the dual plane things picked up a lot. It is a nice little mouse and it sure can smoke the freaking tires for 500ft
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