Jul 11, 2014 · The Vortec 5700 L31 (Vin code 8th digit "R") is a V8 truck engine. Displacement is 5.7 L. It is the last production Generation I small-block. The cylinder heads feature combustion chambers …

Nov 8, 2011 · The L31 Vortec 350 that was installed in all GM half ton trucks (Pick-ups, Tahoes, Suburbans, Vans) put out 255 hp and 330 lb-ft. Whoever told you 430-450 ftlb of torque was off by …

Dec 7, 2014 · The L31 also known as the 5.7L Vortec V8 has one of the largest aftermarkets of any "modern" GM truck engine as its a Chevy small block and its parts are used as performance …

Jul 4, 2006 · Guys, Dave "Dirt" Reynolds has suggested that we devote some space on the message board to Vortec heads. Cylinder heads are arguably the most important link in the "power chain", so …

Aug 15, 2020 · PROBLEM: I have an oil leak out of the bottom of the Timing Cover on a 1997 5.7L Vortec. I've tried 3 times already to get it to seal properly. The Fel-Pro Oil Pan gasket say it DOES …

Jan 1, 2008 · so, im decoding my RPO codes, and so far all is well...except when i got to the engine code which is "L31." this is what it says: L31 : 409 CID V8 400HP (SPECIAL HIGH PERFORMANCE …

Jul 20, 2007 · As such, the L31 head is compatible with all older small-blocks, and is a very popular upgrade. It offers the performance of more expensive heads, at a much lower cost. It does, however, …

Apr 19, 2009 · I am posting this for a friend who is wondering if he can use his older 350 block with vortec heads.He says the block is stamped with the #3970010 on it.Can anyone let me know if this …

Sep 17, 2013 · This is also from the GM powertrain website, the key word is "like", yes the L33 uses components from the LS6 and is constructed like the LS1, but the bore and stroke is actually a 326. …

Feb 21, 2018 · L31 will be much easier to swap into your truck, sence that is what you already have. Some time back, I was looking at phoenix engines, and posted to a thread on GMT400, about what I …