When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
A few months ago, I found this 87 GN in Alabama. The body was solid, but the paint was faded and the car hadn't been started in a few years. A few weeks later, I figured out why. The original V6 had a rod knock. I sold the car to a friend and we strategized on how to proceed. We decided an LS swap was in order.
He removed the engine and began cleaning the car. With a lot of elbow grease, the original paint actually turned out pretty decent!
He installed a mild Comp Cams custom grind cam, dual springs, and pushrods, on the SBE 5.3L. For now, it will have the ON 3 Performance 76/75.
Here are the specs at a glance.
FAST XFI 2.0 ECU.
TCI EZ-TCU
FAST 92 mm intake and TB
Walbro/FAST 450 lph fuel pump
FAST 306008 Injectors
Comp Cams custom grind 225/226 .612/.605 114+3 cam
Comp 850-16 Lifters
Comp 26925TS-Kit springs
Comp 7955-16 pushrods
Comp 7106 Timing set
Rebuilt 4L80E transmission
TCI 9.5" torque converter
ON3 Performance 76/75 turbo
CX Racing IC
Custom headers, cold side and hot side
Summit Racing radiator
It should be running in the next 2-3 weeks. The goal is to have a car that can be daily driven, get 20+ mpg, and run 10's at the track (and maybe down at Mexico as well. ��)
Last edited by kevin87turbot; 03-15-2015 at 09:57 PM.
Nice build. I don't know how much boost you all are planning on running. But, I'm thinking Fast intakes crack. You may wanna research it. An LS6 intake may be in order.
Nice build. I don't know how much boost you all are planning on running. But, I'm thinking Fast intakes crack. You may wanna research it. An LS6 intake may be in order.
Thanks for the input, but you're thinking of the early FAST 90mm intakes. The 92mm FAST intakes are an all new design and do not crack.
01-02-2015, 07:48 PM
1987 Grand National LS Swap with 76mm Turbo 
