Aftermarket connecting rods??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

65standard · 12-31-2015, 07:23 PM

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

BR3W CITY · 12-31-2015, 08:23 PM

IIRC its to have the piston be 0 decked (piston even with block deck).

65standard · 12-31-2015, 08:31 PM

The stock deck height is .025"?

crazy longhorn · 01-03-2016, 12:26 AM

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

12-31-2015, 07:23 PM	#1
65standard Registered User Join Date: Dec 2014 Location: Coal City, IL Posts: 695	Aftermarket connecting rods??? Why are most performance aftermarket connecting rods .025" longer? __________________ Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker

12-31-2015, 08:23 PM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Aftermarket connecting rods??? IIRC its to have the piston be 0 decked (piston even with block deck). __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

12-31-2015, 08:31 PM	#3
65standard Registered User Join Date: Dec 2014 Location: Coal City, IL Posts: 695	Re: Aftermarket connecting rods??? The stock deck height is .025"? __________________ Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker

01-03-2016, 12:26 AM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	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 __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....



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