Jul 10, 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 …

What makes Vortec heads any different from other GM steel heads? Pretty much everything. Beginning with the intake port, which is 170cc with a cast-in 'ski jump' on the port roof which is there to increase …

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 …

Dec 6, 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 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, …

Dec 31, 2007 · 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 …

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 …

Mar 4, 2023 · Looking to hear from anyone who’s put a supercharger on a GMT400 Suburban 2500 with the 5.7 Vortec? I ask bc I’ve always wanted a green over gold GMT400 Suburban 2500 4x4 with the …

Apr 7, 2009 · Admittedly the L31 vortec fuel injection isn't a known performer, but it's not nearly as bad as this engine was acting. I checked cam timing, fuel pressure, crank to cam correlation, to no avail. I …