5.3 vs 243 Heads...Confusion
06-01-2007, 07:03 AM
#12
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Originally Posted by pbraxton
and i was curious why the new 5.3's are making better numbers with those heads.
06-01-2007, 07:12 AM
#14
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Bore 3.78 gasket bore 3.91
Stroke 3.62
Chamber Vol 58.8
Compression Height -0.008
Piston dish Vol 7
Gasket thickness 0.045
Displacement volume -1.471179387
Gasket Volume 8.854378301
Swept Volume 665.7086726
Compression Volume 73.18319891
Compression Ratio 10.09646862
Stroke 3.62
Chamber Vol 58.8
Compression Height -0.008
Piston dish Vol 7
Gasket thickness 0.045
Displacement volume -1.471179387
Gasket Volume 8.854378301
Swept Volume 665.7086726
Compression Volume 73.18319891
Compression Ratio 10.09646862
06-01-2007, 07:13 AM
#15
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Originally Posted by ChevyThunder17
I *think* the piston protrudes .008" out of the deck, similar to the 5.7's. I'm not sure though.
06-01-2007, 08:55 AM
#16
Originally Posted by tdrumm
Bore 3.78 gasket bore 3.91
Stroke 3.62
Chamber Vol 58.8
Compression Height -0.008
Piston dish Vol 7
Gasket thickness 0.045
Displacement volume -1.471179387
Gasket Volume 8.854378301
Swept Volume 665.7086726
Compression Volume 73.18319891
Compression Ratio 10.09646862
Stroke 3.62
Chamber Vol 58.8
Compression Height -0.008
Piston dish Vol 7
Gasket thickness 0.045
Displacement volume -1.471179387
Gasket Volume 8.854378301
Swept Volume 665.7086726
Compression Volume 73.18319891
Compression Ratio 10.09646862
06-01-2007, 09:15 AM
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Originally Posted by colyneedsv8
the new 5.3's have flat top pistons and 9.9:1 compression, ls6 based heads, 90 mm TB/intake manifold and a slightly larger cam. these are the factors producing more power.
here but, where'd you find that detailed info?
06-01-2007, 09:21 AM
#18
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Originally Posted by ChevyThunder17
Yep, I did +.008 for the deck height, didn't click the negative. Twice.
06-01-2007, 09:46 AM
#19
Originally Posted by tdrumm
Unported LS6 heads milled down to 58.8cc chambers with a 3.910 bore x .045 thick gasket on a stock 5.3 shortblock will net you ~10.0:1 compression.