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Old May 8, 2026 | 08:54 AM
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Default Engine replacement
I'm looking at taking a 4.0 block and putting 4.6 heads and cam on it. Into my 03.
Does any one have a list of things that they changed out while doing this?
I've got the heads and motor.
so I'm planning on replacing.
Lifters
push rods
bearings
cam most likely will be a stock 4.6
timing chain and oil pump. I'll pull the front cover off my current 4.6 that has a 2 year old oil pump.
I'll probably do the sensors while I can get to them easy.
Possibly rings if needed

Am I missing anything?
 
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Old May 8, 2026 | 09:41 AM
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if you're doing that you might as well upgrade the cam..add crucifix seals to be replaced while you have oil pan off already.
 
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Old May 8, 2026 | 10:43 AM
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All that will be done. Might as well try to get all the leaks taken care of while its out.
 
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Old May 8, 2026 | 08:50 PM
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Heads on a LR V8 are nearly identical minus the following:

14 Bolt Heads
10 Bolt Heads
10 Bolts with SAI ports

There isn't a specific head for 3.9, 4.0, 4.2, or 4.6 engines.
 
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Old May 9, 2026 | 03:08 PM
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i'll second upgrading the cam. i have Stage 2 and the power difference is noticeable even with 32" tires, a winch, and front and rear steel bumpers.
 
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Old May 11, 2026 | 09:16 AM
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What cam are you using?
 
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Old May 11, 2026 | 03:11 PM
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Originally Posted by ericg
What cam are you using?
Crower or Kent Stage 2. can't remember the brand/manufacturer, but the specs were the same last i looked.
 
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Old May 11, 2026 | 07:51 PM
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I have the crower in both my d2s along with crower lifters. no complaints and nice peace of mind as the stock ones have a tendency to wear out if motor not maintained
 
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Old May 12, 2026 | 08:46 AM
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Does going with an upgraded cam require any changes to the computer? I read in another post that they needed to be remapped.
 
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Old May 12, 2026 | 11:20 AM
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Originally Posted by whowa004
I have the crower in both my d2s along with crower lifters. no complaints and nice peace of mind as the stock ones have a tendency to wear out if motor not maintained
Is this what you used for lifters and the 53230 cam?
Hydraulic Lifter Buick V8 with Upgraded Snap Ring & Cam Saver Oiling
$10.95
Hydraulic Lifter Buick V8 with Upgraded Snap Ring & Cam Saver Oiling
$159.25
 
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