Chevrolet Performance 5.7L/350ci L31 Long Block Crate Engine with Vortec Heads for GM Trucks/Vans
809-12681431
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L31 HD Base Engine
3-Year/100,000-Mile Warranty, some exclusions may apply
Fitment Notes: This engine is not intended for marine use.
Engine Break-In Procedure
Use conventional or break-in oil (non-synthetic) for the first oil change, be sure to check the oil level in the engine and prime the oil system with an engine priming tool.
Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. This is critical to break in the camshaft.
Drive the vehicle with varying speeds and loads on the engine for the first 30 miles. Be sure not to use a lot of throttle or high RPM. Run five or six medium-throttle accelerations to about 3000 RPM (40 to 50 MPH), then letting off in gear and coasting back down to 20 MPH. Run a couple of hard throttle accelerations up to about 5000 RPM (55 to 60 MPH), then letting off in gear and coasting back down to 20 MPH.
Let the engine cool and change the oil and filter using conventional (non-synthetic) oil and check coolant level, top off if necessary. Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading. Change the oil and oil filter again using conventional (non-synthetic) oil. Keep an eye on oil level during the first thousand or so miles.
It would be suitable to use synthetic motor oil after the second recommended oil change and mileage accumulation.
Is this a R code or 4 bolt main engine?
What flywheel should i use for this L31-R and a 700R4 transmission. i am puttin this in a 91 gmc truck but there is a gap about 3/8 to half inch between torque converter and flywheel. is there a flywheel i can use for this application or do i need spacer
Would this engine fit my 83 caprice classic ? Im looking to switch to a v8 carbuerated
Will this motor work for chevy 96 k 2500 with the spider injectors on a manual 5 speed
I’m looking to replace the engine in my 2000 GMC Yukon Denali. If I install it myself, does that void the warranty? If it does, I want to use this 4 bolt main engine but need more torque. If I changed the cam, would the computer operate properly?
Will this engine work with mechanical fuel pump as delivered for my 86 Silverado c10, if not what engine like this will work. Thx!
If I buy this engine...what is the biggest performance cam you guy's recommend for it?
Will this work for a 79 corvette?
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