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Re: 09 4.8 swap for 04 LS1
After '05 or so LS engines were Gen IV versions whereas before that like the LS1 engine you're interested in using is a Gen III and the two are not compatible in a lot of areas. I have an LS1 in my garage that came out of my '98 Firebird and I would've loved to install it in my '09 truck. It requires too much internal engine work in addition to the possibility it wouldn't be permitted due to Calif. smog laws. The Gen III engines have a 24X reluctor wheel while the Gen IV engines have a 58X reluctor wheel which the prev. poster mentioned. The reluctor wheel is used by the ECM to count the crank rpms and the 58X ECM's are also faster and advanced over the older ECM's.
The best bet would probably be to find a newer Gen IV engine with more cubes for your swap and all you would have to do is get a tune on your ECM.
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1989 K1500 Chev. EC
Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit.
2009 Hummer H3T 3.7L 5M (sold)
1997 K2500 Chev. EC 7.4L/ 4L80E
2018 Dodge Ram 2500 HD R/C
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