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: 9,402	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....

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.