L99 to ls3
L99 to ls3 Long story short, my girlfriends ls3 broke a piston, ordered a low mile engine off eBay, when It gets here, it winds up being a l99. Seller offered a pretty significant refund to keep it. So I was wondering what all I would need to buy to delete the dod, afm, and vvt, keeping in mind I already have a ls3 donor engine. All I should need to buy are lifters and gaskets right? Just use the front cover, timing set, chain damper, valley cover, camshaft, etc from the ls3. Will probably go ahead and slide a small cam along with pushrods and valve springs in it since it will be apart
Joined: Apr 2006
Posts: 3,929
Likes: 1,161
From: Grand Rapids, Michigan
Are the LS3 heads still usable? Keep in mind that the L99 doesn't use the hollow stem valves. I'd swap those on as well. If you're keeping the stock cam, have the heads milled .010" and that will make up for most of the compression loss. Either that or install some .040" head gaskets.
Are the LS3 heads still usable? Keep in mind that the L99 doesn't use the hollow stem valves. I'd swap those on as well. If you're keeping the stock cam, have the heads milled .010" and that will make up for most of the compression loss. Either that or install some .040" head gaskets.
wanted to slide a baby cam in it but decided to do some preventative maintenance type stuff instead. New oil pump, timing chain and damper, crank and cam sensors, gaskets, seals and o rings for everything
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TECH Resident
Joined: Jun 2011
Posts: 937
Likes: 472
I didn't see lifter tray exchange on the list. This will be different for DOD versus non-DOD lifter setup.
If you don't use a stock LS3 camshaft, you'll need to re-tune for the upgrade.
A broke piston and valve could mean metallic debris circulated through the engine parts. Be sure to inspect any parts you reuse for damage or debris. You may want to buy new replacement lifters in case there's some inside the old ones.
If you don't use a stock LS3 camshaft, you'll need to re-tune for the upgrade.
A broke piston and valve could mean metallic debris circulated through the engine parts. Be sure to inspect any parts you reuse for damage or debris. You may want to buy new replacement lifters in case there's some inside the old ones.
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12 Second Club
Joined: Dec 2017
Posts: 1,034
Likes: 226
From: San Antonio
Ok so I am using all the engine covers off the blown up ls3, using its cam as it is in good shape still.
parts I’ve purchased are:
delphi lifters
btr lifter trays
btr valley cover gasket
btr head gaskets
btr head bolts
gm balancer bolt
btr flywheel bolts
btr exhaust manifold gaskets
btr intake manifold gaskets
btr water pump gaskets
btr steam vent gaskets
btr stock replacement pushrods (just for freshen up)
gm valve springs (freshen up)
rear cover gasket and rear main seal
front cover gasket and seal
oil pan seal
gm Oil pump
red oil pump o ring
New crank sensor
new cam sensor
btr timing chain
gm tensioner
getting the injectors rebuilt and cleaned
also cleaned all the **** off the valves, lapped the valves, broke all the sharp edges on the heads, cleaned all the gunk and carbon out of intake and exhaust ports, cleaned the tops of the pistons with a small dremel wire wheel and a shop vac and cleaned the hell out of everything
still need to track down an oil cooler gasket and gaskets for where the manifolds attach to the exhaust
parts I’ve purchased are:
delphi lifters
btr lifter trays
btr valley cover gasket
btr head gaskets
btr head bolts
gm balancer bolt
btr flywheel bolts
btr exhaust manifold gaskets
btr intake manifold gaskets
btr water pump gaskets
btr steam vent gaskets
btr stock replacement pushrods (just for freshen up)
gm valve springs (freshen up)
rear cover gasket and rear main seal
front cover gasket and seal
oil pan seal
gm Oil pump
red oil pump o ring
New crank sensor
new cam sensor
btr timing chain
gm tensioner
getting the injectors rebuilt and cleaned
also cleaned all the **** off the valves, lapped the valves, broke all the sharp edges on the heads, cleaned all the gunk and carbon out of intake and exhaust ports, cleaned the tops of the pistons with a small dremel wire wheel and a shop vac and cleaned the hell out of everything
still need to track down an oil cooler gasket and gaskets for where the manifolds attach to the exhaust