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05-30-2010, 12:18 AM
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#1 |
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I'd rather be Blown.
Drives: 1975 CAMARO 454ciBBC/TKO-600 Join Date: Dec 2009
Location: Japan, Yokosuka
Posts: 148
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L99 Heads
Just wondering, how big is the combustion chambers on these heads? I believe stock gets me 10.5-1 cr. If I do a cam/head swap, is there a package that will drop the compression a little?
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05-30-2010, 10:10 AM
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#2 |
     Drives: Camaro Join Date: Apr 2009
Location: Texas
Posts: 1,669
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The chambers are right around 70cc. We offer TSP cnc porting for your heads, or brand new cores & offer machined chambers that can move the chambers up to 73-74cc.
 We've done this a few times for the boost guys wanting to take some compression out of their setups. |
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05-30-2010, 10:35 AM
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#3 | |
   
Drives: 2013 A6 GT 5.0 Join Date: Nov 2009
Location: Edmond, OK
Posts: 2,909
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Quote:
__________________
BLK/BLK 1SS/RS Ordered 11-01-2009 Took delivery 12-22-2009. Heads/cam/converter/bolt ons. SOLD Feb 2015 to fund 6th gen LT1 SS with 8L90E.
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05-30-2010, 10:52 AM
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#4 | |
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I'd rather be Blown.
Drives: 1975 CAMARO 454ciBBC/TKO-600 Join Date: Dec 2009
Location: Japan, Yokosuka
Posts: 148
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Dropping the compression means you can run more boost!
 I switched the heads on my big block to drop the compression down to about 8.5-1 when I put the vortech on. If I didn't do that, it would've knocked like a mother and eat itself in no time. It had small 96cc 396 heads but put the ARF's on it, gained like 20 cc's!  Quote:
Hmmm.... wonder how much lower that would drop the cr when going with a 74cc Heads. Guess thats why people have to build the custom stroker bottom ends to drop the c.r. for the Big numbers. Still, thats pretty cool and at least I know now,thanks! |
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05-30-2010, 10:59 AM
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#5 |
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Drives: 2013 A6 GT 5.0 Join Date: Nov 2009
Location: Edmond, OK
Posts: 2,909
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In most cases your going to reach the stock internal limits before you can up the boost. Truthfully I am going to want stock to about 10.9 when I have my heads done and I will get a blower after that. There are LS3 cars with 700rwhp on 9psi. Do you think they can turn the boost up much more? Having the most compression possible makes for good power and driveability.
__________________
BLK/BLK 1SS/RS Ordered 11-01-2009 Took delivery 12-22-2009. Heads/cam/converter/bolt ons. SOLD Feb 2015 to fund 6th gen LT1 SS with 8L90E.
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05-30-2010, 11:23 AM
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#6 | |
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BAMF SS
Drives: 2016 Camaro 1SS A8 Join Date: Mar 2010
Location: Ford City, PA
Posts: 3,023
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Quote:
__________________
2016 1SS A8: FBO + Circle D + P1X + Meth + Tuned by Pray Performance
Stock Longblock 800 SAE rwhp. 9.4 @ 145 mph. |
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