[RetroLSX]

Hey guys this is Shawn from RetroLSX I’m going to start working on a list of what’s needed to do these swaps and some general tech to make these conversions go in a whole lot easier. Feel free to ask me any questions and I’ll help in any way I can. Don’t forget the 5.3L and 6.0L truck engines are low cost alternatives and make great power for a low cost upgrade to the modern age. This thread will cover everything from engine choices to fuel, electronic, gauges, cooling and anything else needed to take on these swaps. So keep posted I should have this up by the end of the week.

[BadMrFrossty]

Thank you!!!!!!

[RetroLSX]

Motor options

I have run $300 5.3L LM7(cast iron early 5.3L)from 2005 Silverado with 33K from ebay put a used Z06 cam and $180 ebay headers and got 326RWHP and 323RW Torque with 87 oct at 26 MPG and these 5.3L are everywhere and cheap. The truck motors are filling up salvage yards because they last well over 200K miles so there is not enough demand for replacement motors in stock applications. This means these are very reasonably priced buys for great power and fuel mileage. Car Craft recently did a built with a low compression LQ4 with GM L92 heads and got over 500HP. I have sold several 5.3L with under 10K miles with motor and trans for around $1000-$1800 and the 07+ are all aluminum with pre production Z06 heads and a higher compression ratio that still go under $2K from me with a 4L65 trans!. It’s getting to the point that a LS swap is close to the cost of buying a GEN I 383 crate motor. I also deal a lot with the guys who run most the LS salvage yards and do engine locating services for any style LS engine from a low buck 4.8L to a complete new LS7 Z06 drive train.





I offer the full line of GM LS engines and MAST crate motors.
Bolt Pattern
All the new Gen III and Gen IV LS series engines feature a new bolt pattern on the block for the motor mounts so none of the tradition methods will work in adapting it to an older application. All engines from the 4.8L to the Ls9 feature this same bolt pattern.

Electronics

There are a lot of options to go on this route from rewiring the stock harness yourself or having a companies such as.
Speartech.com
CurrentPerformance.com
Wait4meperformance.com

GM also sells new plug and play wiring kits that include the drive by wire pedal for all 03+ Gen IV motors. Along with GM electronic kits to run the coil packs with a carb or the Electronic transmissions without the ECU. Just know that to control a electron trans a computer box is needed for the swap.
Fuel Systems

More choices here on this part of the install as well from buying a new tank from a company like Ricks hot rod shop, to modifying your stock tank with a modern fuel pump. LS1tech.com has a lot of good write ups and guides for this portion of the install for addition help as well. Or run a carb on your engine with the stock tank and a LS engine running in a weekend with the least amount of work.
Rock valley and ricks hotrod offer stainless EFI tanks but cost a decent amount close to 1K!
I offer some OEM looking replacements from Spectra that are 599 plus shipping that are sumped and baffled with a high volume GM EFI tank.
For the fuel filter regulator use
This is the part number from a corvette fuel filter (FPR), is from a 1999 C5 Corvette. Most time just ask for a fuel filter from NAPA or any parts dealer



The FBR will require fittings to adapt to traditional 3/8" lines and 5/8" return lines. One option is Russell performance

Fittings needed to adapt
(2) 3/8" fittings, part number RUS-639210 or RUS-640850
For the tank to regulator line and the fuel line connecting to the fuel rails
(1) 5/8" fitting part number RUS-640860
return to the fuel tank from the regulator

Front Accessories
GM is now offering the C5 and C6 accessories as complete kits for under $900 with A/C for a compact design with OEM quality at a reasonable price. Or without A/C for around $650
I also offer relocation kits for OEM truck,corvette, and camaro/firebird to top mount the A/C for a Sanden 508(Vintage Air Style compresor) for under $200
Or
Relocation kits for the PS and Alternator for under $300
Or just the ALT kit for $180


LS kits /Headers
A lot of options out there from Kooks, Hooker and countless others. I even have my own line in development that will offer complete exhaust systems from the header to the exhaust tips! The one thing I’m doing is going to keep the cost reasonable!

Oil Pans,

Each car need a special pan the LH8 or a this Custum pan i helped develped is best for the first gen while the 98-02 F-Pan works for the 7-92 F-Bodys


This is only a very quick overview and a briefly touched on some of the big questions; I’m a big GM guy so I recommend keeping these conversions as much GM as possible. This will keep maintenances parts available at any local parts store and readily availably for a very long time. Ask me any questions you have about these conversions and I’ll be happy to help or at least guide you in the right direction of someone who can.

[BadMrFrossty]

This thread must last forever!

[DEROID]

So what do you thinnk of the ls6 motor that makes 480 horse? what would i need for that swap?

[RetroLSX]

I believe the GM 480HP engine is a variation of the LS3 not the Ls6. The LS6 is a good motor but it pretty much is an improved LS1 with better oiling, better 243 heads with light sodium filled valve springs running an OEM 550/550 lift cam. The improvements made to the LS6 are in just about every GEN IV motor (04 and newer) except the light valves. Even the new 5.3L run 799 cast heads which are the same as a LS6 243 with only non sodium filled valves. Any LS engine is going to take about the same to drop in a car. What’s the car your dropping it in? What’s the trans? EFI or carb? Dont forget low mile pullout motors keep cost down and these last 150K plus miles so a under 30K mile pullout its just broke in!

[RetroLSX]

Also for cooling systems BeCool offers some killer LS specific radiators and electric fans. If you on a budget an OEM 4 core radiator will work fine and just bolt on a Lincoln MRK 8 fan from 93-98. These are great low cost fans for these swaps. As of the stem vents the best option is to tap the water pump and run the line into the pump for a clean install. Or you can tap it into the radiator lines.