im looking to get the LT2, a throttle body & flex fuel kit, im curious to see what the car will pull with my K&N cold air intake and long tube headers that are already into the car.

Look up Phastek on Youtube. They have a great how-to video on modding the LT2. Also check out this link for the LT2. You will need a few tools, 23/32 drill 1/2 14 tap. The brass fitting from GPI and their harness or Phastek sells a harness and port fitting also. But on Phastek, you have to cut your stock tubing. Watch the videos and you will understand. Look at the links on the attached YT video. He provides great resources. And if you are going 95mm with an adaptor, you don't need anything else to fit that to the LT2. I would not port the LT2 anywhere as you only gain a few hp's. And the hassle of doing it yourself could get ruin the intake. But do what you want.

https://www.youtube.com/watch?v=qA5pWdQIBtk

so are you saying you wouldn't recommend the LT2 at all if I'm planning on getting a TB and flex fuel kit?

No, that's not what I meant. I guess you misunderstood me. The LT2 can be ported at the neck and the runners to the heads. But with that porting you are only getting a few hp and torque numbers. The porting however can be $300/400 or more. I don't think that amount is worth the 5 horses and 6 torque numbers you gain from porting. I'm going LT2 (not ported), a 95mm with adapter in a couple months, hopefully get it for Christmas :). I currently have a ported stock TB. I am also adding flex fuel when I put in the LT2 next week. I have Trifecta who will calibrate the flex and the LT2.

So I DO recommend the LT2. I also recommend doing the work yourself. For 250 I can buy the LT2 and complete the modding or you can get one from GPI for 700 who will do the modding for you and that's with NO porting. You add porting and it adds 300. :noidea:

The LT2 intake needs to be slightly modified to fit our LT1 powered cars. If you order one from gwatney performance for a little more money, they will send it modified and ready to bolt onto our cars. You also need a map sensor extension harness which can also be ordered from gwatney when you order your LT2 intake.

so basically I will be able to complete everything I need from this link?

https://gwatneyperformance.com/produ...old-126977114/

Correct. You would choose the 74.95 manifold modification option and the 39.95 map extension harness. I didn’t check what throttle body you’re using but it looks like they sell adapter plates in that link if you are using a different throttle body versus stock. I personally would skip the porting.

You “may” also need some extra rubber line. I never went through with my install of the manifold (just sitting in my garage) but I remember reading you may need some 3/8 rubber line to connect to I believe the pcv. I could be wrong about this and I wouldn’t worry too much about it. You can literally go to any auto parts store to get some 3/8 rubber line if you wind up needing it. You can buy a longer line than you need and cut it with a knife. I bought 3 feet because it’s the smallest Amazon had at the time. Probably only need 6 inches max.

would you recommend using the stock throttle body? I pm'd you btw

From the research I've done it seems it all depends on other mods. A stock car will not benefit as much from an aftermarket TB like one with a cam or a blower would.

Also, you can do a before and after dyno, same as I did. My shop charged me like ~$60 for a before dyno, it wasn't much.

The main reason I am buying the LT2 from Rockauto for 187 and doing the modifications myself is GPI is on a 6-7 week lead time on their LT2 with the modifications. I didn't want to wait that long. If you do, more power to you. I forgot to put that info in on my last message.

Good luck with upgrades.

Has anyone tried spacers between intake and heads? seems like 1/4" would be more than enough. You also get more runner lenght.