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I bought this block off Jay from Richard Clark's garage 2 years ago when I thought we were building a 109 stroker motor. Richard found a really good condition block where standard bore pistons could even be used if desired. We since decided to use a Stage 2 block for 1000 hp. I paid $1200 for...

ECU GN kit - Includes the ECU GEN computer and Coil on plug kit. Includes 6 GM coils, Boost Crew coil bracket kit, and complete harness for the coil on plugs including mint spark plug wires. Includes the wide Band 02 sensor. Will sell with or without Racetronixs 120 pound injectors. Car has a...

My Air Temp sensor that screws into the air intake box is bad. Can anyone give me a part number please?

GN1 Long rod stroker kit. Brand new, bought in November directly from GN1. Never used. Changed direction with a TA block and custom pistons so no use for this kit. 3.625 4340 crank. H beam 6.350 rods, JE 020 over pistons with a 3.82 bore.. Calico main and rod bearings. ARP rod and main studs...

Looking to upgrade from the stock header setup. I have an internal wastegate with a stock style 3 bolt turbo flange. Looking to run 30 pounds of boost with a 64-66 turbo. I'd rather not have to change out the downpipe and convert to external waste gate.

I bought these heads brand new 2 months ago from GN1 and decided to go a different direction. These heads are for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. The heads feature a 170 stainless valves and exhaust valves are stainless 160. They have new keepers...

I have an offroad test pipe that I would like to put an electronic cutout kit on to. What is everyone using? And recommendations?

Looking for a new roller camshaft for my new engine winter project I am building. I am retiring my stock longblock so I have matching numbers before I blow it up. I'm currently running a 6262 turbo at 28 pounds of boost but I want to preserve it. So I am building a 251 stroker (GN1 kit) 109...

I have a Grand National that's pulling 16-17 inches of vacuum at idle. The car doesn't want to run under 900 rpms for idle. The car is modified with 120 pound injectors, bigger fuel system, 62-62 turbo, Precision dog house and Accufab throttle body. I have the ECUGN and I have it tuned pretty...

Does anyone know where to get spare C Clips for the actuator waste gate?

I am trying to dyno tune my new setup and when I have it in 3rd gear at 2500 Rpm it down shifts into 2nd gear. Even trying it from 3000-3500 rpms the car down shifts. I saw a youtube video with another guy having the same problem with his Grand National. Anyone else have this issue?

I am finishing putting together my combination for my 87 GN which includes Precision 62-62 @ 25 psi, PT stock location IC, PTC 10 inch converter, 3 inch downpipe, RJC intake plate, upgraded fuel system, and EEC GN blue box computer running on E85. I want the maximum amount of torque response...

Does anyone know where to get GN covers that will protect the front seats? I'd like something clear that is a little form fitting if possible. I seen some auctions on BAT for some Mint GNX with very low miles and they had them on there. Any input is appreciated.

My valve cover oil cover just came off and was laying in my engine bay. I tried finding a quick fix for a replacement screw on cap but none of them fit. Anyone have any suggestions on how to fix this without taking the valve cover off or any replacement cap I can use till I can get the valve...

New poster here. I bought a 87 this winter and I'm looking for some parts for it. Can anyone give me a good resource for buying parts for the grand national? I need new power window motors, and a refurbed power brake booster assembly. Mine's pretty loud when I step on the gas. Thanks