HEAD CC EXPERTS IN HERE...NEED HELP FAST!!!
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! My heads were sent out to get the CC's measured...
Stock 5.7L heads are 67cc's
Mine measured out to be 61.6cc's...
which means they are milled to about .030" right??
11:1 compression... <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
And these heads were supposed to be stock compression... <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />
Stock 5.7L heads are 67cc's
Mine measured out to be 61.6cc's...
which means they are milled to about .030" right??
11:1 compression... <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
And these heads were supposed to be stock compression... <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />
On The Tree
Joined: Jan 2003
Posts: 148
Likes: 0
From: in the air of course!
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! just build the bottom end on that thing. Some nice Diamond slugs <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Or go to a thicker HG from cometic, but you will only gain 20 thou from that. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Or go to a thicker HG from cometic, but you will only gain 20 thou from that. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! Diamond slugs are almost 1000 bucks...
I would rather sell the heads, get 6.0L, and just get boost pistons...and still have a safe C/R
I would rather sell the heads, get 6.0L, and just get boost pistons...and still have a safe C/R
TECH Enthusiast
Joined: Sep 2002
Posts: 658
Likes: 0
From: Clinton Twp. Michigan
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! Bos Diamond pistons can be had for much less than a grand, i got my custom made pistons for 800 bucks, if you buy there off the shelf dished boost pistons, you are only in it for around 600.
!Dial-up Director
Joined: Nov 2001
Posts: 3,100
Likes: 1
From: Louisiana
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! That sucks BOS. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" /> Good excuse for a low compression motor built for boost now eh? <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Stock 6.0L heads, diamond boost pistons, stock rods, ARP rod bolts, and new bearings would be what I would do on a budget.
Justin
Stock 6.0L heads, diamond boost pistons, stock rods, ARP rod bolts, and new bearings would be what I would do on a budget.
Justin
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
TECH Fanatic
Joined: Dec 2002
Posts: 1,084
Likes: 0
From: Bring it........ b*tch
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! Bos,
Saw your car on Saturday. I'd think if you didn't damage your bottom end you might be able to get away w/ a set of stock CR 6.0 heads?
I think the dished Diamond's are supposed to be around 9.5 CR. Would probably be lower with the larger chamber LS1 heads. You'd really be able to crank up the boost with those.
Good luck w/ your Hawk.
Saw your car on Saturday. I'd think if you didn't damage your bottom end you might be able to get away w/ a set of stock CR 6.0 heads?
I think the dished Diamond's are supposed to be around 9.5 CR. Would probably be lower with the larger chamber LS1 heads. You'd really be able to crank up the boost with those.
Good luck w/ your Hawk.
TECH Addict
Joined: Dec 2001
Posts: 2,298
Likes: 2
From: new england
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! BigBos, have you considered keeping hi compression and running boost anyway? The more compression the less boost motor will be able to accept. This way driveability is good in non boost driving and full throttle out put shoulkd be great also. Yes this will require proper timing and tuning to work good but why not run it like this? Anyone try this?
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! Well these heads are anywhere from 10.7:1 compression to 11:1 compression which is high...
So...
If I did go with low compression pistons, how low (C/R wise with the piston) would I have to go to get at a safe level, if I can't sell the heads, this is what I'm doing..
So...
If I did go with low compression pistons, how low (C/R wise with the piston) would I have to go to get at a safe level, if I can't sell the heads, this is what I'm doing..
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! I'd think you should be safe with 10.0 compression, thats what Jim is running now with the 9lb pulley. Anything under 10 is extra insurance I'd say. Personally, for a daily driver and something that I wouldnt want to rebuild anytime soon I'd go 9.5 at most.
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LS1derfull:
<strong> BigBos, have you considered keeping hi compression and running boost anyway? The more compression the less boost motor will be able to accept. This way driveability is good in non boost driving and full throttle out put shoulkd be great also. Yes this will require proper timing and tuning to work good but why not run it like this? Anyone try this? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">11:1 is a pretty high bench mark to start with boost. He would have to keep the boost so low that it would make FI negligable
3 psi = 13.0
4 psi = 14.0
6 psi = 15.5
Now, if he was building an all-out race motor, then I would agree to keep the compression high. But unless he has a 110 octane pump in his backyard.....
Just my .02
<strong> BigBos, have you considered keeping hi compression and running boost anyway? The more compression the less boost motor will be able to accept. This way driveability is good in non boost driving and full throttle out put shoulkd be great also. Yes this will require proper timing and tuning to work good but why not run it like this? Anyone try this? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">11:1 is a pretty high bench mark to start with boost. He would have to keep the boost so low that it would make FI negligable
3 psi = 13.0
4 psi = 14.0
6 psi = 15.5
Now, if he was building an all-out race motor, then I would agree to keep the compression high. But unless he has a 110 octane pump in his backyard.....
Just my .02
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by BIGBOS:
<strong> Well these heads are anywhere from 10.7:1 compression to 11:1 compression which is high...
So...
If I did go with low compression pistons, how low (C/R wise with the piston) would I have to go to get at a safe level, if I can't sell the heads, this is what I'm doing.. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You are going to have to run at least a 15 cc dish piston to bring the compression down to 9.5. Here are some dish sizes to get you started.
10cc = 10:1
12cc = 9.7:1
14cc = 9.5:1 (minumum)
16cc = 9.3:1
18cc = 9.1:1
These are all for a stock motor with 61 CC heads.
Good Luck,
Kevin
<strong> Well these heads are anywhere from 10.7:1 compression to 11:1 compression which is high...
So...
If I did go with low compression pistons, how low (C/R wise with the piston) would I have to go to get at a safe level, if I can't sell the heads, this is what I'm doing.. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You are going to have to run at least a 15 cc dish piston to bring the compression down to 9.5. Here are some dish sizes to get you started.
10cc = 10:1
12cc = 9.7:1
14cc = 9.5:1 (minumum)
16cc = 9.3:1
18cc = 9.1:1
These are all for a stock motor with 61 CC heads.
Good Luck,
Kevin
TECH Fanatic
Joined: Nov 2001
Posts: 1,055
Likes: 0
From: Chi-Town
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! sell your heads, buy some replacements, do minor port work in the chamber and the bowl, slap them on.
cheapest and fastest solution in my head anyway
cheapest and fastest solution in my head anyway
Launching!
Joined: Sep 2002
Posts: 297
Likes: 0
From: Clinton Twp. Mi
Re: HEAD CC EXPERTS IN HERE...NEED HELP FAST!!! BIGBOS - I can get you pistons for less than $1000.00.
Custom flat tops with pins - $727.00 for the set
Custom domes with pins - $777.00 for the set
Custom dish with pins - $757.00 for the set
The prices above are with the good H13 tool steel wrist pins also.
Let me know if there is anything I can do for you.
Thanks,
Chris Gelineau
Diamond Pistons
877-552-2112 toll free
Custom flat tops with pins - $727.00 for the set
Custom domes with pins - $777.00 for the set
Custom dish with pins - $757.00 for the set
The prices above are with the good H13 tool steel wrist pins also.
Let me know if there is anything I can do for you.
Thanks,
Chris Gelineau
Diamond Pistons
877-552-2112 toll free
