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06-26-2009, 09:56 PM
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#1 |
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Registered User
Join Date: Jun 2009
Location: Calif
Posts: 7
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sb head work
Has anyone ever grinded a sbc head comb. chamber out from a 64cc to 72 cc. I am running -22 disc pistions. With thick head gaskets. But wanting to get my compression down to 8.0 or less. Wondering how much grinding there is.
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06-26-2009, 09:59 PM
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#2 |
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Registered User
Join Date: Oct 2008
Location: Livermore ca
Posts: 699
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Re: sb head work
Thats a ton of grinding not sure it would be worth it. Sounds like you are putting a blower on. Why not just sell those heads and put the money into another set.
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06-28-2009, 10:49 AM
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#3 |
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Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
Posts: 3,118
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Re: sb head work
I would not EVER consider attempting doing that. The chamber is thin enough and prone to cracking. Besides, unles you have a cnc program for THOSE heads,, it's more likely you'll just screw up a set of heads with oidd shaped chambers of unequal volume. Why make a less than ideal situation worse! What kind of motor are you building that you have -22cc dishes, a thick head gasket (yuck) and need a 72cc chamber. A +.030 over 350 with a standard 0.025 deck, normal 0.041" thick FelPro head gasket, -22cc dishes and a 64cc head is at 8.2:1 compression already. If your building a blower or turbo motor,, I think you should listen to chevybuilder. A set of the "RIGHT" heads for the build would be a drop inthe bucket in terms of build costs.
__________________
Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. Last edited by Marv D; 06-28-2009 at 10:50 AM. |
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06-28-2009, 05:40 PM
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#4 |
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Registered User
Join Date: Jun 2009
Location: Calif
Posts: 7
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Re: sb head work
Start from the top :
2 Edelbrock 1407s - 750 cfm 871 BMD blower 12 lb boost Dart heads 230 cc 64 cc c chamber 2.02 / 1.60 1.55 spring Comp Cam # 300BR-14 114 lobe 0.575 - 0.575 lift 255 262 Duration @ 050 JE Pistions -22 D shape dish .030 Eagle forged 4340 h beam rods 5.7 Eagle forged crank 3.750 mallory distributor / msd box |
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06-28-2009, 05:59 PM
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#5 |
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Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
Posts: 3,118
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Re: sb head work
NICE package ichy,, what cubic inch motor? With only a 5.7 rod I'm assuming it's not a 4" stroke. I was always taught that a forced induction motor doesn't need a lot of runner x-section. Why the 230cc intake ports with such a small (realitively) valve? Was it to get the big exhaust side?
Again, unless your zero decked, wouldn't 8.2 work? Maybe I'm missing something but at worse I'd go to a full dish instead of the D-cup before I'd whack on the heads in any way.
__________________
Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
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06-28-2009, 09:17 PM
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#6 |
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Registered User
Join Date: Jun 2009
Location: Calif
Posts: 7
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Re: sb head work
Attachments are always better !
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06-29-2009, 02:11 PM
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#7 |
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Hay Team!!
 
Join Date: Jun 2003
Location: Ft. Worth, TX, USA
Posts: 366
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Re: sb head work
Listen to Marv....
Never try to open a set of 64cc heads that much. They sell heads with different combustion chambers for a reason. The best way to change the chamber is to buy big and then mill it down if you need to. Head manufacturers give specs on how to mill and how much you can go. Please do not try to port a 64 chamber out to 72 or 76 cc........
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1972 Chevrolet Cheyenne LWB "Orange and White" 8) |
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