what to look for 5.3 or 4.8
If you dont have the donor truck there to inspect, pulling the pan is the easiest way to determine for sure 4.8 or 5.3
I tried to measure stroke with a piece of wire to determine if my engine was 4.8/5.3 and couldnt get a consistent measure. Had to pull the pan anyways to swap to Fbody and checked the numbers then
I tried to measure stroke with a piece of wire to determine if my engine was 4.8/5.3 and couldnt get a consistent measure. Had to pull the pan anyways to swap to Fbody and checked the numbers then
Last edited by Pocket; Mar 18, 2010 at 01:09 PM.
TECH Fanatic
Joined: Jul 2005
Posts: 1,685
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From: Beebe, Arkansas
Remove a spark plug place cylinder at TDC and look in the cylinder with a flash light. I also scrape the carbon off the top with a wooden dowel rod makes IDing it easier. Its pretty easy to see the differance. The 4.8L will be flat and 5.3L will be dished.
Now the newer 07 GMT900 Gen IV's are all flat tops now. Also some Gen III HO 5.3L had flat tops as well. These are easily ID as they have the 799 or 243 heads!
Really only way to ID the newer Gen IV ones is via the VIN or pull the pan.
Now the newer 07 GMT900 Gen IV's are all flat tops now. Also some Gen III HO 5.3L had flat tops as well. These are easily ID as they have the 799 or 243 heads!
Really only way to ID the newer Gen IV ones is via the VIN or pull the pan.
