Don't thrash me for the questions here guys. I've looked for a good solution for several weeks.

I have an unknown year LQ4 (iron). Most likely 1999 since the Cam bearings for a 2004 didn't fit correctly and the 1999 cam bearings did. The engine was in wonderful condition. Dad was told ~25k miles, and I believe it. We left the bottom end alone, just cleaned thoroughly. Sourced some super clean low mileage 243 heads and re-lapped the valves. Headers and a healthy Trickflow TFS-30602003 cam. Things are looking up, until I see this ugly truck intake. This is where the questions begin.

In keeping with the cathedral ports on the 243's, I would like to use an LS2 intake. Is it possible to swap all the pieces over from the fugly truck style intake to an LS2 intake? The big unknown is will the throttle body transfer. Any additional elaboration for the conversion would be good to know too.

Morgan

 

What's the LQ4 going in? Running the car intakes with the truck waterpump has clearance issues on top hose outlet. If swapping to the car pump you have to also run the car accessories.

 

It's going into a '72 C10.

 

I believe your current throttle body is a 3 bolt, and the LS2 is a 4 bolt. The LS2 is also the worst factory LS manifold in existence.

Instead, find an LS6 manifold. Will look the same, but takes your current 3 bolt throttle body and makes better power.

 

Or get a Dorman replacement LS2, that one performs very well. But then you'll need a 3 bolt to 4 bolt adapter for your TB.

 

Believe it or not, the factory truck intake flows better than the stock LS2. In the Form vs. Function Dept. it is the winner.
Are you willing to sacrifice power for looks?

 

Aesthetics outweigh performance at this point. So the LS2 could be used with a 3 to 4 bolt adapter. What else can be reused as-is from the truck intake?

 

You might want to read this:

https://ls1tech.com/forums/general-l...s6-intake.html

and this:

https://www.hotrod.com/articles/20-l...ifolds-tested/

Do you already have the LS2 intake? Because the LS1, LS2, and LS6 will all look the same. But the LS6 will outperform the others, and actually fit your intake. You can't reuse your rails or injectors as far as I know. And you'll need to fabricate or buy a throttle cable bracket, LS2s are DBW.

 

LS6 beats LS2 every way here. It will outperform the LS2, plus your TB bolts right on.