A few Trans am LS6 swap questions.
I bought an Ls6 and Ecm out of an 02 Corvette. I'm swapping it out with the old Ls1.
Are there any things that need to be changed out? Will the Ls1 harness work with the Ls6 ecm?
I'm sure the oil pan must be changed.
My headers and intake should work fine over the ls6 intake and exhaust manifold, right?
I shouldn't have to get the Ls6 ecm flashed for these mods will I?
Any help is appreciated.
How can I find out for sure?
You need to look at the heads, ls6 heads are casting 243. 241 heads are ls1. If that all checks out the only way to tell what year it is would be to take the cam timing gear off and look at the numbers stamped into the cam. or pull the heads and weigh the valves
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Of course if I'm wrong someone will correct me.
The Best V8 Stories One Small Block at Time
Has anyone ever heard of somebody putting 243 heads on an ls6 block, that has the ls1 cam, and calling it an Ls6 just to sell it? Or am I being paranoid? I just don't want to get ripped off again.
I read that some ls1's have the ls6 block and after 01, they used ls6 intake. I Just want to be positive it's got an ls6 cam.
Of course if I'm wrong someone will correct me.
Has anyone ever heard of somebody putting 243 heads on an ls6 block, that has the ls1 cam, and calling it an Ls6 just to sell it? Or am I being paranoid? I just don't want to get ripped off again.
I read that some ls1's have the ls6 block and after 01, they used ls6 intake. I Just want to be positive it's got an ls6 cam.
I've looked at a few, but does anyone have recommendations on brand, or best place to buy them?
Will I need new gaskets where the header connects to manifold?
Would it be worth the extra cash to add an underdrive pulley as well?
Yes, get new header gaskets. Exhaust leaks will really screw with your tune.
Don't worry about the UD pulley unless you're going all out. It's easy enough to go back in later and put one on.
Do get a ARP pulley bolt and don't reuse the stock bolt not even to get the pulley back on.
If it has the original lifters you may want to replace them anyway (with stock new ones).
And do the rocket trunnion/bearing upgrade.









