Cooling and Fueling Advice · The LS & LT Swap Community

Cooling and Fueling Advice

Looking for some input and real-world experience on cooling setups and mounting solutions for my OBS LS swap.

Originally this was supposed to be a “budget build”… but as everyone else and know me knows that ship has sailed 😂. So now I’m just trying to make smart decisions without lighting any more money on fire.

I’m planning to step up from the 28” to a 34” radiator—leaning toward a stock-style GMT400 HD or possibly a GMT800 setup with matching fans/shroud. Trying to figure out what actually works best vs. what just sounds good on paper.

For trans cooling, I’ve already got a Tru-Cool 40k with braided lines and AN fittings on the way, so that part should be handled.

A few things I’d appreciate some feedback on:

Best radiator/fan combo for the 34” swap (OEM vs aluminum)
Clean mounting solutions for the bigger radiator
Any gotchas going from 28” to 34”
OEM fans vs. After market.
Fuel system setup (line size, routing, hard line vs AN, regulator/filter setups, etc.)

Goal is a solid, reliable setup that stays cool—without overspending again.

Appreciate any advice.

5 comments