327 HP Rating - Team Camaro Tech
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post #1 of 27 (permalink) Old Sep 18th, 05, 10:03 PM Thread Starter
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327 HP Rating

I am in the middle of rebuidling my 327. I ran the numbers through desktop dyno, but I can't believe the numbers I am getting - nearly 400 HP and torque? Can someone double check me please. Set up listed below

327 Stock Short Block - flat top pistons
Comp Cams HE268
Eldebrock Performer RPM Heads
Eldebrock Performer RPM Intake
750 Holley
Thorley Headers
2.5" Flowmaster exhaust

Did I miss anything?

I am still acquiring parts. Any other suggestions to improve performance?

Thanks
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post #2 of 27 (permalink) Old Sep 18th, 05, 11:09 PM
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Re: 327 HP Rating

400 on the torque Is about right. What flow numbers are you using on the heads?

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #3 of 27 (permalink) Old Sep 19th, 05, 06:16 AM
 
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Thumbs up Re: 327 HP Rating

Imho, a good 327 is a heck of a little motor!

GM got the little bugger just about "dead-nuts" right from the git-go!

That's why it runs so good from the 300hp motor all the way up to the 375hp fuelie one.

It has just a big enough bore to suck good and just a short enough stroke that you can still rpm her right up there! And with only stock, 160 cc heads too, so this is why I say you really don't need a head bigger then a 180 at max.

Gooooood motor!

pdq67



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post #4 of 27 (permalink) Old Sep 19th, 05, 04:21 PM
 
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Re: 327 HP Rating

Quote:
Originally Posted by ghack
I am in the middle of rebuidling my 327. I ran the numbers through desktop dyno, but I can't believe the numbers I am getting - nearly 400 HP and torque? Can someone double check me please. Set up listed below

327 Stock Short Block - flat top pistons
Comp Cams HE268
Eldebrock Performer RPM Heads
Eldebrock Performer RPM Intake
750 Holley
Thorley Headers
2.5" Flowmaster exhaust

Did I miss anything?

I am still acquiring parts. Any other suggestions to improve performance?

Thanks
Hey, see how the desktop dyno would read the same stuff but with the cylinders overbored .30 over and oversized valves, (valves from the 350cu-in)
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post #5 of 27 (permalink) Old Sep 19th, 05, 05:31 PM
 
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Smile Re: 327 HP Rating

The valves should be the same size unless the 327 has little 1.72"/1.50" vs the more standard 1.94"/1.50" and hi-po 2.02"/1.60" ones.

pdq67



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post #6 of 27 (permalink) Old Sep 19th, 05, 10:29 PM
 
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Re: 327 HP Rating

Ok then, do the same setup but with the cylinders bored .030 over
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post #7 of 27 (permalink) Old Sep 19th, 05, 11:02 PM
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Smile Re: 327 HP Rating

This is what I get. Don't know for sure on the flow numbers.

327 standard 4.000 bore 358 HP at 5500 , 382 TQ at 4000.

327 .030 overbore (4.030) 359 HP at 5500 , 387 TQ at 4000 RPM

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #8 of 27 (permalink) Old Sep 20th, 05, 11:20 AM
 
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Re: 327 HP Rating

Quote:
Originally Posted by TJS69
This is what I get. Don't know for sure on the flow numbers.

327 standard 4.000 bore 358 HP at 5500 , 382 TQ at 4000.

327 .030 overbore (4.030) 359 HP at 5500 , 387 TQ at 4000 RPM
Damn all you get is a 1/5 upgrade?!?
I have been lied to all my life, from this it seems boring the cylinder is useless. Guys, tell me something is wrong here.
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post #9 of 27 (permalink) Old Sep 20th, 05, 12:14 PM
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Talking Re: 327 HP Rating

Boring a small amount like .030 isn't going to gain you much. Boring is mainly for rebuiling - to clean up the bores. A .030" overbore only adds 4.6 CI. A much larger overbore is not possible as the cylinder bores are to close together.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #10 of 27 (permalink) Old Sep 20th, 05, 12:18 PM
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Re: 327 HP Rating

Quote:
Originally Posted by crackyflipside
Damn all you get is a 1/5 upgrade?!?
I have been lied to all my life, from this it seems boring the cylinder is useless. Guys, tell me something is wrong here.
Nope, nothing wrong... I think TJS69's numbers are much closer than ghacks... Think about what .030" is in actual size, that's 3 - 100ths of an inch. That's not much extra bore and yet it still shows a small increase... I wouldn't knock that at all. Typically you over bore to remove cyl wall damage or wear. I'd rather have the stock bore and the additional wall thickness when talking about your typical sbc 283, 302, 327 and 350.

...Dennis

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post #11 of 27 (permalink) Old Sep 20th, 05, 12:32 PM
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Talking Re: 327 HP Rating

As PDQ67 and Djd are saying is that a small 327 can actually outperform a 327 that has been built up. Forget about a 750 carb. a 600 will work better. The 268 cam is probably too big also. I know now that my cam is too big in my 327, and I have allready changed the carb to a 600. Take PDQ's advice and install a smaller solid lifter cam. If you want, you can always build a 383 for more power !

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #12 of 27 (permalink) Old Sep 20th, 05, 05:03 PM
 
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Re: 327 HP Rating

Quote:
Originally Posted by DjD
Nope, nothing wrong... I think TJS69's numbers are much closer than ghacks... Think about what .030" is in actual size, that's 3 - 100ths of an inch. That's not much extra bore and yet it still shows a small increase... I wouldn't knock that at all. Typically you over bore to remove cyl wall damage or wear. I'd rather have the stock bore and the additional wall thickness when talking about your typical sbc 283, 302, 327 and 350.
Im feeling really when somebody says bored 30 over or 40 over is that .030" or .3"???
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post #13 of 27 (permalink) Old Sep 20th, 05, 05:28 PM
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Re: 327 HP Rating

Do you have a real name? No offense intended but your screen name makes me feel l'm talking baby talk every time I say it!!

30 over = .030"
40 over = .040"


...Dennis

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post #14 of 27 (permalink) Old Sep 20th, 05, 06:08 PM
 
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Smile Re: 327 HP Rating

Don't take it personally, b/c we tend ta type in shorthand AND I'm really bad about it b/c I will get ta mouthing so trying to get my points across.

Tends to leave the younger and newbie guys on the side..

Don't mean to so please ask if any of us typing something that you don't understand and we will slow down and try to inform you up to speed sorta deal..

pdq67

PS., He, He!! and a couple of us have a habit of wanting to use real names too....



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post #15 of 27 (permalink) Old Sep 20th, 05, 06:28 PM
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Re: 327 HP Rating

real names r good.... i even used mine in my user id!





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