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Old 07-29-2021, 01:20 PM   #1
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Mike_The_Grad's Avatar
Join Date: Oct 2013
Location: Santa Paula, CA
Posts: 549
07 tahoe engine replacement help

Hey everyone I am currently in the middle of pulling a bad engine and replacing it with a reman engine on my buddys 2007 chevy tahoe with 5.3.
I already have it to the point where I am pulling the engine out in about an hour. The reman engine showed up yesterday. Everything matches up part number wise. My question is because this is my first ls replacement/swap. What needs or should be replaced while we are in the middle of this operation? His radiator leaks so that will be replaced. I know we should replace thermostat. His old engine has 200,000+ miles on it. What else and how to go about replacing it. Like sensors, crank position, oil pressure, temp sensors, etc. Is there a special way it was yo be done or can they just be pulled and cleaned up and put into the new engine? Or do they need to be in a certain orientation in order for them to come out, etc. I already know about priming the engine before we start it with oil. I have a pressure tank already yo go with correct fittings.
For sure I'm telling him that belts, spark plugs, thermostat, has to be replaced. What else? I'm going to continue researching online in the mean time and it will be at least 2 days before the engine goes in the truck. I will check back in mostly in the evenings and mornings to look for any help. Thanks you guys.
1972 C/10 LWB - Mine
1964 C/10 LWB - My Dad's

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Old 07-29-2021, 01:56 PM   #2

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Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
Re: 07 tahoe engine replacement help

Suggestions, nothing set in stone here but we do these in my shop all the time. Sensors can swap if they were working. Don't forget intake manifold gaskets, front cover gasket, oil pan gasket, plug wires, air filter, oil cooler block off gasket, valve cover gaskets, throttle body gasket, valley gasket, exhaust manifold gaskets and studs/hardware. Add water pump, idler and tensioner for insurance. If not installed in the long block: oil pressure switch screen. Technically you should also replace the VLOM (lifter solenoid assembly) but that's a fair gamble to take. Clean the MAF. Check the intake really well. PM me if you have questions.
'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids

Last edited by LEEVON; 07-29-2021 at 02:26 PM.
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