LT1 vs LT4
Race Director
Joined: Feb 2002
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From: Compound in the Grove, Ga.
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St. Jude Donor '16
None..... The LT4 is an LT1 on drugs 
Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
If you liked the LT1, you'll love the LT4. And in fact it has one less thing to worry about than the LT1: it has no EGR system because the extra cam overlap made it unnecessary.
This is not specific to the LT4, but all 1996 C4s (LT1 and LT4 alike) have a fully enabled OBD2 system. If you plan to do mods and then recalibrate/reflash the PCM, you need different and more expensive software for any 96. If you're keeping it stock, that's not a problem. And depending on the emissions inspection laws where you live, you may be required to have a 96 emissions tested whereas earlier non-OBD2 cars are not required. That's a requirement in the county where I live, but those rules are all over the map around the country. Anyway, if you've ever owned a 96 LT1 car, you've had the same system and emissions requirements.
This is not specific to the LT4, but all 1996 C4s (LT1 and LT4 alike) have a fully enabled OBD2 system. If you plan to do mods and then recalibrate/reflash the PCM, you need different and more expensive software for any 96. If you're keeping it stock, that's not a problem. And depending on the emissions inspection laws where you live, you may be required to have a 96 emissions tested whereas earlier non-OBD2 cars are not required. That's a requirement in the county where I live, but those rules are all over the map around the country. Anyway, if you've ever owned a 96 LT1 car, you've had the same system and emissions requirements.
Le Mans Master
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From: Manassas VA
Safety Car
Joined: Apr 2016
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From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
What I meant was a person can get a bit by putting in a Hot Cam and NOT having to do a tune. The computer will handle it. Once you go to headers, I am not so sure if it has the brains to accomodate them.
