Need lower compression
Need lower compression I've saved up enough to get my supercharger/cam/clutch installed, but I'm worred about my motor and rear end.
Could I use some 6.0L heads to lower the compression? How much would a set cost? I've researched this but I'm still unsure on how well they will work on a stock 346. Does anything need to be done to them?
I will be installing a Vortech 9# kit with Aftercooler and a thunder racing supercharger cam with new valve springs.
What would go first, the rear end or the motor? Car gets run pretty hard. Its a 2001 with 56000 miles.
Could I use some 6.0L heads to lower the compression? How much would a set cost? I've researched this but I'm still unsure on how well they will work on a stock 346. Does anything need to be done to them?
I will be installing a Vortech 9# kit with Aftercooler and a thunder racing supercharger cam with new valve springs.
What would go first, the rear end or the motor? Car gets run pretty hard. Its a 2001 with 56000 miles.
Re: Need lower compression 6.0's will loser the CR to about 9.8:1.
You can lower them a little further by using a thicker gasket.
This is a cheap way to lower your CR
when i got my 6.0's i did a mild port job and a 3 angle valve job.
You can lower them a little further by using a thicker gasket.
This is a cheap way to lower your CR
when i got my 6.0's i did a mild port job and a 3 angle valve job.
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: Need lower compression I think speed Inc has a deal going on now w/TEA..
You can probably get 6.0L heads w/whatever CC you want for cheap...
I have 73cc chambers in my heads, and that gives me 9.5:1 compression on a stock 346c.i. motor
You can probably get 6.0L heads w/whatever CC you want for cheap...
I have 73cc chambers in my heads, and that gives me 9.5:1 compression on a stock 346c.i. motor
TECH Enthusiast
Joined: Dec 2001
Posts: 553
Likes: 0
From: Columbia, MD
Re: Need lower compression Go with TEA. They have the best prices and some of the best flow numbers around. I didn't go with the low compression heads, but even still, the 5.7L heads woke up my car to the tune of 536RWHP with the Vortech S/C and 8PSI. I'm sure you'll do even better with the 6.0L heads.
Re: Need lower compression The only 6.0L heads I saw on speed inc were 2200$. I'm just looking for something to get me by untill I can afford new pistons and rods. I figured I could find some used 6.0L heads for pretty cheep, install new valve springs and not have to worry about blowing my motor up untill I get enough money to rebuild it. Am I missing something? Why are the 6.0L heads so high. All I want is bigger combustion chambers...
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On The Tree
Joined: Jun 2002
Posts: 123
Likes: 0
From: San Diego
Re: Need lower compression A guy around here is running 9psi on a stock LS1...no problems. You should be fine.
If you really want to, just buy some used 6.0L heads, i don't know if they'll flow as well as the 5.7L heads (or is that just the 5.3L's?) if they are unported. You should be able to just unbolt the 5.7 heads and bolt up the 6.0 heads.
I don't think the money and time are worth it, your stock CR should be ok with that. If you are THAT worried about it, i think the cheaper/easier solution would be to get 5 or 6lbs pulleys until you get your pistons and rods....just a thought.
If you really want to, just buy some used 6.0L heads, i don't know if they'll flow as well as the 5.7L heads (or is that just the 5.3L's?) if they are unported. You should be able to just unbolt the 5.7 heads and bolt up the 6.0 heads.
I don't think the money and time are worth it, your stock CR should be ok with that. If you are THAT worried about it, i think the cheaper/easier solution would be to get 5 or 6lbs pulleys until you get your pistons and rods....just a thought.
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