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sbc 400

 
69nova355.
I mow my lawn and find Chevys
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Joined: 08/09
Posted: 03/15/10 06:48 AM

+1  

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gsoto73
I love my Chevy Chevette!
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Joined: 03/10
Posted: 03/15/10 09:38 PM

once you pull your motor apart and you figure what you have. you can go to the comp cam website and use it to help determine the best cam for your toy. here is the link.

http://www.compcams.com/v002/Company/CC/CamRecommendation/CamHelp.aspx


406 farm truck

Laugh  

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Pontiacman2
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Posted: 03/16/10 05:38 AM

+2gettn  
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nvrhapy
V-6 Camaros rule!
Posts: 49
Joined: 03/10
Posted: 03/21/10 03:59 PM

ok got a chance to take the stock heads off the 400 and this is what the pistons look like


CIMG0101


im assuming that these would be considered dished pistons?????

so this would mean that these pistons are stock and the engine has a low compression right?  

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Pontiacman2
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Posted: 03/21/10 04:58 PM

Right they are low compression dish pistons.  
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nvrhapy
V-6 Camaros rule!
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Posted: 03/21/10 05:11 PM

so if i keep these pistons would that hurt me in building hp?  

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Pontiacman2
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Posted: 03/21/10 05:18 PM

Yes, but that depends on the chamber size of the heads you will be using.  
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nvrhapy
V-6 Camaros rule!
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Posted: 03/21/10 05:28 PM

not sure if this answers your question but the combustion chamber volume is 64cc  

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nvrhapy
V-6 Camaros rule!
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Posted: 03/22/10 07:37 PM

well i got a reply back from comp cam they want to know what my compression ratio is before they will tell me what the best cam will be..... can some one help me figure out my compression ratio i have no idea how to do this???? Confused  

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ethelkilledfred-#001
I mow my lawn and find Chevys
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Posted: 03/22/10 07:54 PM

Icon Quotenvrhapy:
well i got a reply back from comp cam they want to know what my compression ratio is before they will tell me what the best cam will be..... can some one help me figure out my compression ratio i have no idea how to do this???? Confused

My guess would be @9:1. If you put a pic of you heads showing the chamber side valves, it would help on the guess.

58cc 10.78:1
64cc 10.14:1
68cc  9.76:1
72cc  9.40:1
76cc  9.08:1

This is based on Speed Pro pistons
H615CP30
Bore 4.155"
Stroke 3.75"
Dome Shape .135 dish, 4 VR
Dome Volume -12.5 cc  
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tuffnuff
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Posted: 03/23/10 04:06 AM

+1
A pic and head casting #'s would help a lot with the guessing
Smile  
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nvrhapy
V-6 Camaros rule!
Posts: 49
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Posted: 03/23/10 03:13 PM

the heads im using is the gm performance vortec heads


CIMG0097 2

CIMG0100  

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nvrhapy
V-6 Camaros rule!
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Posted: 03/23/10 03:16 PM

America's favorite high performance cast iron small-block cylinder heads offer big power and bigger value. The Vortec cylinder heads fast burn combustion chamber and high velocity ports combine to produce big horsepower out of the box. Vortec heads can be mildly ported for additional performance and can be milled up to .040'' for increased compression ratio. The Vortec head uses 1.94'' intake valves and 1.50'' exhaust valves to compliment the high velocity port design. The Vortec head out-flows the bow-tie head out of the box and is a 20 to 40 horsepower bolt-on increase over earlier cast iron small-block heads. Vortec Heads require a Vortec style intake manifold due to its improved manifold mounting flange and gasket design and raised intake ports. It is not recommended that the heads be modified to accept early design intake manifolds. Vortec heads fit all small-block engines produced 1955 to present, excluding LT1/LT4 reverse coolant flow engines and current LS1 style engines. Heads come completely assembled with valves, springs, retainers, and 3/8'' rocker studs. Requires the use of self-aligning rocker arms.


Material: Cast Iron
Intake Port Volume: 170cc
Combustion Chamber Volume: 64cc
Vale Diameter: 1.94'' Int./ 1.50'' Exh.
Spark Plugs: Straight
Special Note: Valve Springs - .475 Max Lift



off teh jegs site  

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chevelle83
I mow my lawn and find Chevys
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Posted: 03/23/10 08:32 PM

wow no guide plates? otherwise looks like a winner to me. I want to try a set of these on my next build.  

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Pontiacman2
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Posted: 03/24/10 05:05 AM

You should be around 9.8-10:1cr depending on head gasket used.  
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