What is comp ratio, LS1 w/ 5.3 heads?
09-12-2009, 11:36 PM
#1
What is comp ratio, LS1 w/ 5.3 heads? I searched and didn't find my answer. I got a set of TEA 5.3 1.5 heads that I am putting on my Firehawk next month with a cam swap.
What is the cc's of the 5.3 heads?
I don't think the heads have been milled. I am going to have the machine shop cc them when I have the different valve springs put in.
I did read a couple threads about having the 5.3 heads milled to 59cc. I think I read that will put the compression around 11:1 or 11.4 to 1.
Thanks in advance.
Jason
What is the cc's of the 5.3 heads?
I don't think the heads have been milled. I am going to have the machine shop cc them when I have the different valve springs put in.
I did read a couple threads about having the 5.3 heads milled to 59cc. I think I read that will put the compression around 11:1 or 11.4 to 1.
Thanks in advance.
Jason
09-13-2009, 12:27 AM
#2
Need more information. Try going to this site and fill in the fields for an answer:
http://www.csgnetwork.com/compcalc.html
By my estimate, you should be around 11.3:1 with a 59cc chamber and .045 gasket thickness.
http://www.csgnetwork.com/compcalc.html
By my estimate, you should be around 11.3:1 with a 59cc chamber and .045 gasket thickness.
09-13-2009, 08:13 AM
#4
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Chamber volume of stock 5.3 heads is 61cc.
However, because yours were worked over by TEA, you can expect the chamber got enlarged some to account for the larger 2.02 intake valve.
If not milled, you will find yours are probably around 63-64cc now, which would put you in the 10.7:1 ballpark with stock gaskets.
I have TEA 5.3 heads as well (stg 2). I wanted them at 59cc, and TEA had to mill them .025" to get to that volume. With .040" gasket, and -1cc or so cut out of the piston, mine calculated out to 11.67:1.
However, because yours were worked over by TEA, you can expect the chamber got enlarged some to account for the larger 2.02 intake valve.
If not milled, you will find yours are probably around 63-64cc now, which would put you in the 10.7:1 ballpark with stock gaskets.
I have TEA 5.3 heads as well (stg 2). I wanted them at 59cc, and TEA had to mill them .025" to get to that volume. With .040" gasket, and -1cc or so cut out of the piston, mine calculated out to 11.67:1.
09-13-2009, 12:50 PM
#6
Chamber volume of stock 5.3 heads is 61cc.
However, because yours were worked over by TEA, you can expect the chamber got enlarged some to account for the larger 2.02 intake valve.
If not milled, you will find yours are probably around 63-64cc now, which would put you in the 10.7:1 ballpark with stock gaskets.
I have TEA 5.3 heads as well (stg 2). I wanted them at 59cc, and TEA had to mill them .025" to get to that volume. With .040" gasket, and -1cc or so cut out of the piston, mine calculated out to 11.67:1.
However, because yours were worked over by TEA, you can expect the chamber got enlarged some to account for the larger 2.02 intake valve.
If not milled, you will find yours are probably around 63-64cc now, which would put you in the 10.7:1 ballpark with stock gaskets.
I have TEA 5.3 heads as well (stg 2). I wanted them at 59cc, and TEA had to mill them .025" to get to that volume. With .040" gasket, and -1cc or so cut out of the piston, mine calculated out to 11.67:1.
I am using the TR230 cam. I am sure i will have to check PTV clearance.
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09-13-2009, 08:37 PM
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I ran PRC 5.3 heads on my CETA and if I remember correct they said the coompression ratio would be about 10.75:1 with stock GM MLS gaskets
