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5.3 dropped a valve *Re-Build Time*

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Old Apr 19, 2019 | 08:46 PM
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Default 5.3 dropped a valve *Re-Build Time*

So my engine dropped a valve the other day. This engine has been a good one for me in my FFR Daytona Coupe. I have always wanted a little more power out of it though, so now is a good opportunity to do some upgrades.







This is the plan so far, but subject to change.

Bore the block to 3.898"
New Malhe Forged pistons 4cc valve reliefs
Replace the 3 damaged scat rods
Texas Speed 227cc CNC heads
Texas speed magic stick 3 cam
Full roller rockers

I'll put updates here over the next few months as I make progress on it. I've ordered the pistons and rods. Next will be to get the block and rotating assembly to my machine shop for all the mill work.
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Old Apr 21, 2019 | 08:23 AM
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As cheeeeep as you can pick up a 5.3 at the boneyard, I wouldn't futz with "rebuilding" that one.

Start over with a non-destroyed short block, and apply your proposed upgrades to that.
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Old Apr 21, 2019 | 04:03 PM
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I have shifted my plan a bit. I just ordered a new 6.0L block and pistons. Picking them up in a couple of days. Going with LS3 heads and a mild cam. Shooting for around 500HP. That will be a nice bump in power from where I am now with tons more torque.
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Old Apr 21, 2019 | 04:13 PM
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Originally Posted by jkrueger
I have shifted my plan a bit. I just ordered a new 6.0L block and pistons. Picking them up in a couple of days. Going with LS3 heads and a mild cam. Shooting for around 500HP. That will be a nice bump in power from where I am now with tons more torque.
Iron block or aluminum?
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Old Apr 21, 2019 | 08:35 PM
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Iron Block.
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Old Apr 22, 2019 | 06:12 AM
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Originally Posted by jkrueger
I have shifted my plan a bit. I just ordered a new 6.0L block and pistons. Picking them up in a couple of days. Going with LS3 heads and a mild cam. Shooting for around 500HP. That will be a nice bump in power from where I am now with tons more torque.
excellent plan!
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Old Apr 22, 2019 | 08:00 AM
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Indeed. Much better approach.
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Old Apr 22, 2019 | 01:02 PM
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Mild cam 6.0 vs a 5.7 with a donkey dick cam should be a lot more fun in a road race car

You could bore the 6.0 to 4.065 and do some drop in LS3 pistons also...

If you don't wanna go that big ws6store sells some nice 4.040's
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Old Apr 23, 2019 | 10:25 AM
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Yea, you really nailed it. It looks like the valve went sideways and started to knock out the spark plug.
Anyway, the above advice is good. I wouldn't spend alot on a 5.3. Do the bigger motor.
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Old Apr 27, 2019 | 07:30 PM
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Got the block and the pistons. Still waiting on my replacement Scat rods so I can get it balanced.

There are some sharps edges left over from the machining process on the block. It did come with cam bearings though.


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