L83 piston&rods in geniii/iv block?
Thread Starter
Staging Lane
Joined: Mar 2016
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L83 piston&rods in geniii/iv block? Im looking to build an oem style high compression 5.3 with a Gen III block...
The GenV stuff is so nice- will these valve reliefs line up with earlier 5.3 heads?
11:1 CR in my '14 L83
The GenV stuff is so nice- will these valve reliefs line up with earlier 5.3 heads?
11:1 CR in my '14 L83
Thread Starter
Staging Lane
Joined: Mar 2016
Posts: 64
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L83 piston specs? Is it a dumb question? I did the google.
I get conflicting stuff on actual CR of the 2014 DI 5.3 (11 or 11.5:1?), however I know the pistons are notched and that they sound nicer than the stock 4.8 pop-ups the older 5.3 guys are swapping to add compression.
I get conflicting stuff on actual CR of the 2014 DI 5.3 (11 or 11.5:1?), however I know the pistons are notched and that they sound nicer than the stock 4.8 pop-ups the older 5.3 guys are swapping to add compression.
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
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From: Wilmington, De
They reversed the intake and exhaust valve positions on the Gen V head, so the valve reliefs may not line up with a Gen IV head.
You can also use a 4.8 flattop piston and smaller chamber heads to get the compression up. The flattops were also used the the Gen III L33 and the Gen IV 5.3s.
You can also use a 4.8 flattop piston and smaller chamber heads to get the compression up. The flattops were also used the the Gen III L33 and the Gen IV 5.3s.
Thread Starter
Staging Lane
Joined: Mar 2016
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TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 332
From: Wilmington, De
The OEM 4.8 piston is a flattop with no reliefs.
I don't know what the L83 pistons look like having never seen one in person, and too many different pistons pop up when I try searching for one.
I don't know what the L83 pistons look like having never seen one in person, and too many different pistons pop up when I try searching for one.
