LT-4 upgrade thread.
Thread Starter
Race Director
Joined: Feb 2003
Posts: 18,484
Likes: 1
From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
LT-4 upgrade thread.
Multiple topics that have been discussed numerous times, but I didn't pay close enough attention. So, I have a handful of questions.
1) Headers - primary diameter for a basically stock LT-4? May eventually get head work and a hot cam upgrade, but that's all I am condidering on this car. I know 1 7/8 are too big. But what are your thoughts on 1 3/4 vs 1 5/8?
2) Preferred plug wire upgrade?
3) Preferred spark plug upgrade?
That's it for now.
Thanks!
1) Headers - primary diameter for a basically stock LT-4? May eventually get head work and a hot cam upgrade, but that's all I am condidering on this car. I know 1 7/8 are too big. But what are your thoughts on 1 3/4 vs 1 5/8?
2) Preferred plug wire upgrade?
3) Preferred spark plug upgrade?
That's it for now.
Thanks!
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Basically stock motor is best served by the smallest primary header you can find.
Wire upgrade? Everyone has a different preferrence. Pick what you like.
Spark plug upgrade? Upgrade? A spark plug is nothing more than a controlled air gap...stock works as well as anything.
Larry
Wire upgrade? Everyone has a different preferrence. Pick what you like.
Spark plug upgrade? Upgrade? A spark plug is nothing more than a controlled air gap...stock works as well as anything.
Larry
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
Originally Posted by LT-4 CE
Multiple topics that have been discussed numerous times, but I didn't pay close enough attention. So, I have a handful of questions.
1) Headers - primary diameter for a basically stock LT-4? May eventually get head work and a hot cam upgrade, but that's all I am condidering on this car. I know 1 7/8 are too big. But what are your thoughts on 1 3/4 vs 1 5/8?
2) Preferred plug wire upgrade?
3) Preferred spark plug upgrade?
That's it for now.
Thanks!
1) Headers - primary diameter for a basically stock LT-4? May eventually get head work and a hot cam upgrade, but that's all I am condidering on this car. I know 1 7/8 are too big. But what are your thoughts on 1 3/4 vs 1 5/8?
2) Preferred plug wire upgrade?
3) Preferred spark plug upgrade?
That's it for now.
Thanks!
As for wires, use anything that's decent, Taylor makes some nice ones.
For plugs, I use NGK-TR55's on my LT4 and they run great.
Thread Starter
Race Director
Joined: Feb 2003
Posts: 18,484
Likes: 1
From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
Originally Posted by Zix
Personally for the headers I would go with the 1 3/4", mainly because you will not lose anything down low and you start to make a very good increase in the lower-end of the midrange and all the way up top. The LT4 responds very well to that size header. Dynos consistantly show 315-320RWHP and 320+ RWTQ, up from an average 300-305 RWHP and RWTQ. Forum member Perfusion recently put longtubes on his otherwise stockish (K&N and Corsa) LT4 and got some great numbers...hopefully he'll chime in here or you can drop him a PM and ask him what his final numbers were.
As for wires, use anything that's decent, Taylor makes some nice ones.
For plugs, I use NGK-TR55's on my LT4 and they run great.
As for wires, use anything that's decent, Taylor makes some nice ones.
For plugs, I use NGK-TR55's on my LT4 and they run great.
THanks again.
