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hp estimates on 454?

 
dakotar95
I love my Chevy Chevette!
Posts: 7
Joined: 05/13
Posted: 05/06/13 10:07 AM

Hi guys im new here and was wondering what your opinion was on the power my 454 will produce after the build. I am just curious, thanks

stock 454 out of 78 truck
stock dished pistons i think 8:1 comp.? (hp gain with domed pistons? maybe 10:1?)
performer rpm cam: 240 int./246 exh,  LSA 112*
performer rpm intake
750 cfm qjet
hooker super comp headers
large oval port 781 heads  (hp with stock heads? hp gain with bigger valves?)

im just a 17 year old hoping to be a gear head lol this would all be going in my 72 chevelle 4 speed

thanks guys  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 05/06/13 01:31 PM

Maybe 400hp in that configuration.

IMO that cam isn't the best option for your heads and compression ratio.

Don't get hung up on hp numbers, they're not what moves the car. Without changing anything else, the Performer cam will make your combination more entertaining.  
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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 05/06/13 02:09 PM

I agree with Joe about 400 should be close.
That BB with better heads, a roller cam and rocker setup, good single plane intake and a dominator carb and higher compression, could get you close to 600hp. It is wise to start small and get used to a milder combo before you step up. Performance is like a drug the more power you get the more you want. I stopped when I could no longer put all I could make to the ground even with 17" wide slicks.  
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]

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dakotar95
I love my Chevy Chevette!
Posts: 7
Joined: 05/13
Posted: 05/06/13 11:44 PM

would this cam be better matched? if it is, how would it perform compared to my performer rpm?  

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skyeking
I mow my lawn and find Chevys
Posts: 2738
Joined: 08/09
Posted: 05/07/13 12:44 AM

Hi there,
 I would opt for about 7* or 8* less on the inlet @ 50/1000".
 Keeping the torque for rice burning adventures.
 Good luck with a great motor....Skyeking..  
skyeking

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 05/07/13 05:42 AM

Did you have another cam in question or are you asking about the Performer v Performer RPM?  
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dakotar95
I love my Chevy Chevette!
Posts: 7
Joined: 05/13
Posted: 05/07/13 08:40 AM

Sorry i had a link but it wouldn't let me post it last night. It was a lunati voodoo cam i believe. Around 227 int. 233 exh. ? And 110 lsa. Ill try and post the link later today  

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dakotar95
I love my Chevy Chevette!
Posts: 7
Joined: 05/13
Posted: 05/07/13 09:27 AM

Lunati 10110703 - Lunati Voodoo Camshafts

I was correct: 227 int. 233 exh. 110 lsa

Wat do you guys think?  

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p2-72chevelle383
I mow my lawn and find Chevys
Posts: 1757
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Posted: 05/07/13 01:46 PM

That cam would help a little by bleeding off less compeession. But with 8to 1 cr your cam and power choices aee limited.  
p2-72chevelle383

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 05/07/13 01:52 PM

With the engine combination listed above, you need a lower duration camshaft to optimize the package. If you are willing to raise the compression ratio to 9:1 or 9.5:1, then you can expect perfomance from the Lunati cam you've chosen. If you are going to build a motor with 8:1 compression ratio, you have to cam the engine accordingly.  
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p2-72chevelle383
I mow my lawn and find Chevys
Posts: 1757
Joined: 08/09
Posted: 05/07/13 04:01 PM

+1 however with 8 to 1 that's maybe an rv cam at best. Anymore duration will be a turd on the low end  
p2-72chevelle383

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dakotar95
I love my Chevy Chevette!
Posts: 7
Joined: 05/13
Posted: 05/07/13 10:59 PM

ok how about this, what if i achieve 10:1 cr with new pistons. What does that change power wise and matching the parts with each other? would the rpm cam be better suited then?

really sorry for all the questions guys, im just a kid trying to learn. Thanks for the knowledge, i appreciate it.  

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skyeking
I mow my lawn and find Chevys
Posts: 2738
Joined: 08/09
Posted: 05/07/13 11:19 PM

Hi there,
with 10/1 pistons and the limited heads the 230* cam
would be as high as I would go personally. Skyeking...  
skyeking

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dakotar95
I love my Chevy Chevette!
Posts: 7
Joined: 05/13
Posted: 05/07/13 11:32 PM

limited heads? ive read everywhere that the 781 heads are the best flowing production heads out there along with 049's. what am i missing?  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 05/08/13 05:44 AM

If you are satisfied with production performance production parts are fine, but if you are looking for more performance than what the factory made you need to upgrade your parts selection.

You can use the rpm cam if you want but I can tell you from experience that Edelbrock's RPM cams leave some to be desired. Don't believe everything you see in the manufacturer's catalog/website.  
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