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The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 6000. The engine specs and information listed here is for the stock LQ4 engine.
anyone know the piston to deck clearance on a stock LS2 and LS3 engine? I'm trying to calculate compression ratios. thinking about putting an ls3 block into my gto w/ 317 heads. a quick Google reveals that about .007 out of the hole more or less.
The blueprint deck height of the block is 9.240 in., but it’s common to find them in the 9.230-in. range. It’s best to measure deck height before ordering your rotating assembly. Thicker head gaskets or using an aftermarket 6.098-6.100 in. rod will ensure enough piston-to-head clearance.
This iron 6.0L LS engine pushes the stock pistons about 0.008-inch above the deck, which helps compensate for the 0.053-inch MLS head gasket thickness to create a reasonable 0.045-inch piston-to-head clearance.
l Cylinder Head Deck Height - Measuring from the Centerline of Crankshaft to the Deck Face 234.57-234.82€mm 9.235-9.245€in l Cylinder Head Deck Surface Flatness - Measured Within a 152.4€mm (6.0€in) Area 0.11€mm 0.004€in l Cylinder Head Deck Surface Flatness - Measuring the Overall Length of the Block Deck 0.22€mm 0.008€in
The LS design can take up to a 4.125˝ stroke without the need to clearance the rods for cam clearance. Just how big can you go with your LS? Aftermarket blocks are readily available with a 9.750˝ deck height – a 0.510˝ increase from the factory 9.240˝.
Deck Height Calculator. Block Deck Height (Inch). Connecting Rod Length (Inch). Crankshaft Stroke (Inch). Piston Compression Height (Inch) Piston to Deck Clearance:
From cylinder heads to the camshaft, here's a complete rundown of all the vital engine specs you need for the 6.0L LQ9 LS engine.
Block Deck Flatness: 0.22mm / 0.008" (length of Deck) Main Bearing Bore Dia. (P): 69.871-69.889mm / 2.750-2.751" Valve Lifter Bore Dia. (P):21.417-21.443 / 0.843-0.844"
Just make sure you know the exact HQ compressed thickness, and amount out of hole. If it ends up really on the tight side, just avoid building up carbon if it's a street engine. I've seen some really tight quench engines start tapping the piston on the head.