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-   -   Aftermarket connecting rods??? (https://67-72chevytrucks.com/vboard/showthread.php?t=693260)

65standard 12-31-2015 07:23 PM

Aftermarket connecting rods???
 
Why are most performance aftermarket connecting rods .025" longer?

BR3W CITY 12-31-2015 08:23 PM

Re: Aftermarket connecting rods???
 
IIRC its to have the piston be 0 decked (piston even with block deck).

65standard 12-31-2015 08:31 PM

Re: Aftermarket connecting rods???
 
The stock deck height is .025"?

crazy longhorn 01-03-2016 12:26 AM

Re: Aftermarket connecting rods???
 
I will take a shot @ the ?....speaking from gen I experience (mostly), the pistons are generally about .025 below the deck. These engines, ran a factory gasket, in the range of .015- .018... (.040- .042 on the deck). This made a nice 'quench" figure....rebuild, the pistons are .025 shorter, & if you compound that with a .038 gasket, it don't take long to figure that you have crap for quench? The stock pistons on my 5.3 LS, are slightly positive deck (factory)! however, I understand that the replacement pistons, on the overbore are slightly shorter? If you are seeing a longer c to c on the rod, it may compensate for this....so you can still run the thick multi layer gasket , without decking the block;) I am very new to the LS mills, but will report what I see ;) The stock LS, that I did the top end on....did have pistons , that were positive deck (maybe .006)....Longhorn


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