Questions about 6.0L heads....
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From: Chi-Town, IL
Questions about 6.0L heads.... It looks like I will be buying a pair of these soon...
73cc chamber will drop me down to 9.5:1 compression...
I'm gonna stick with the stock bottom end for now, and run these heads, with cometic gaskets and might do ARP head bolts while I'm at it...
Now for the 2nd time, you think my bottom end would hold up fine for a while until I get more $$ for a built motor....
Also I got 6psi last time it was on the rollers, how much of a drop to expect with the 6.0L's??
Thanks,
Bos
73cc chamber will drop me down to 9.5:1 compression...
I'm gonna stick with the stock bottom end for now, and run these heads, with cometic gaskets and might do ARP head bolts while I'm at it...
Now for the 2nd time, you think my bottom end would hold up fine for a while until I get more $$ for a built motor....
Also I got 6psi last time it was on the rollers, how much of a drop to expect with the 6.0L's??
Thanks,
Bos
Staging Lane
Joined: Nov 2001
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Re: Questions about 6.0L heads.... Stock 6.0 heads are 70cc's which is not too far from the stock LS1's of 67. I do not know if you meant that you are going to open up the 6.0's to 73cc's.
I have a set of 6.0 heads that I am planning on using. I might have a spare. I will look into it if you need a set.
Bill F.
I have a set of 6.0 heads that I am planning on using. I might have a spare. I will look into it if you need a set.
Bill F.
On The Tree
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From: Stalking the streets of Maryland
Re: Questions about 6.0L heads.... What do you mean "open" them up to 73cc's? How much do 6.0L heads go for? These are the heads I was looking to for the future. Thanks guys.
BH
BH
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From: Chi-Town, IL
Re: Questions about 6.0L heads.... I was informed that 6.0L heads were 73cc chambers, I e-mailed TEA about it... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Might have to special order it
<small>[ January 28, 2003, 10:50 PM: Message edited by: BIGBOS ]</small>
Might have to special order it
<small>[ January 28, 2003, 10:50 PM: Message edited by: BIGBOS ]</small>
Thread Starter
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From: Chi-Town, IL
Re: Questions about 6.0L heads.... Ok, I got it all straight now, I got to order the 73cc option, its a no charge option though, so its all good.. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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From: Clinton Twp. Michigan
Re: Questions about 6.0L heads.... Yes BIGBOS Shaun is his name, the shop is called SMC Performance, in Pontiac, Michigan, i think, not sure of city, but i know how to get there, i deal with him often, he sells them separate, and is super affordable, tell him Jason from Mach Performance sent ya, he'll take car of you for a fair price, i think the last time i talked to him, 6.0l heads were like 500/600 bucks.
<small>[ January 29, 2003, 12:29 AM: Message edited by: ZYA_LTR ]</small>
<small>[ January 29, 2003, 12:29 AM: Message edited by: ZYA_LTR ]</small>
Launching!
Joined: Jan 2002
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From: Detroit, Murder City
Re: Questions about 6.0L heads.... FWIW, I have a car sitting here that has unported 6.0L heads on top of a stock rotating assembly (including cam) with twin turbos at 10psi. It makes over 510rwhp and 540rwtq on my Mustang Dyno and 93 octane pump gas. You really shouldn't have too much trouble with 6.0L heads and 6 psi unless the tune is WAY off.
Thread Starter
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From: Chi-Town, IL
Re: Questions about 6.0L heads.... TEA is currently out of 6.0L cores, but they offered to do a 5.7L head with a 73cc chamber, advantages/disadvantages?? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Re: Questions about 6.0L heads.... Well the 5.7L do not flow as well as the 6.0L's according to some. Jason99ta compared the flow characteristics of 6.0L heads to LS6 heads and the 6.0L heads flowed better in the low and midrange unported. The ls6 shined in the upper range..
Re: Questions about 6.0L heads.... I was told 6.0L heads would drop the c/r to 9.7-correct? Also, if 6.0L heads flow better than LS6's then why would people go to 4.8L heads when going NA (How much does 4.8L heads raise the c/r?) I know 6.0's drop the c/r down but isn't flow what its all about? It would seem the 6.0 would be better regardless of N/A or F/I. Also, why is lower compression better on FI?? I'm new. Thanks.
Thread Starter
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From: Chi-Town, IL
Re: Questions about 6.0L heads.... I was informed that the only advantage to the 6.0L head is the better exhaust port, I was told that was the only real advantage..
I went ahead and ordered the TEA S2 5.7L 73cc head, that will drop me to 9.5:1 compression... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I went ahead and ordered the TEA S2 5.7L 73cc head, that will drop me to 9.5:1 compression... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Thread Starter
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From: Chi-Town, IL
Re: Questions about 6.0L heads.... Also when I hit 6psi last time I dynoed, and that was about 10.6:1 compression...how much PSI will I lose dropping the compression a point?
On The Tree
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From: Stalking the streets of Maryland
Re: Questions about 6.0L heads.... Do 6.0L heads come from one of the truck engines? Are they aluminum heads? I've been getting a little confused on how Litres, Cubic Inches, and compression ratio tie together. Can someone explain in a little bit of detail how the numbers work? I realize dropping the C/R is always a benefit to boost, but are there other advantages to the 6.0L heads(ie supposedly larger exhaust ports)?
BH
BH
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From: IL
Re: Questions about 6.0L heads.... Yes, to answer your first question, the 6.0L heads are out of the GM trucks. They're aluminum heads used in the 6.0L variant of the LS1 engine.
Because the 6.0L heads are used on a slightly bigger engine, the cc of the combustion chambers are also slightly larger. Because the chambers are slighly larger, the overall compression ratio is dropped. Another added benefit is that the ports on the 6.0L heads are also slightly larger then the 5.7L heads. As was stated earlier, they actually flow about even with a set of LS6 heads which is also a plus when you're forcing a lot of air thru the engine (as you are in a boosted application).
With a boosted engine, the use of slightly thicker head gaskets (which is another method of increasing combustion chamber size), will also slightly lower compression. Thats why people opt to run 6.0L heads along with the thicker headgaskets when building a low compression motor isn't an option.
Because the 6.0L heads are used on a slightly bigger engine, the cc of the combustion chambers are also slightly larger. Because the chambers are slighly larger, the overall compression ratio is dropped. Another added benefit is that the ports on the 6.0L heads are also slightly larger then the 5.7L heads. As was stated earlier, they actually flow about even with a set of LS6 heads which is also a plus when you're forcing a lot of air thru the engine (as you are in a boosted application).
With a boosted engine, the use of slightly thicker head gaskets (which is another method of increasing combustion chamber size), will also slightly lower compression. Thats why people opt to run 6.0L heads along with the thicker headgaskets when building a low compression motor isn't an option.
Re: Questions about 6.0L heads.... Dropping a motor a full point of compression is supposed to be a 3% reduction in total power... I'd look for corroboration on that.
We reduce compression to lower the octane (cooling properties of gasoline).
Higher octane just cools down the mixture so that we don't have early, or pre-ignition going on in the cylinders.
We reduce compression to lower the octane (cooling properties of gasoline).
Higher octane just cools down the mixture so that we don't have early, or pre-ignition going on in the cylinders.