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 Cottons Performance Center
 105 Walnut St.
 Agawam, MA 01001
 Ph:  (413) 789-0531
 Fx:  (413) 789-0401
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Home » Buick Grand National » Intercoolers & Cooling Systems


Oil Cooler Hose Set
Product ID: BUO1062-SC


CLASSIC TUBE now has an exact oil-cooler replacement hose set, unique to the ’86-’87 models. GM discontinued these Grand National and Turbo Regal oil cooler hoses long ago. CLASSIC TUBE has duplicated the hard line hose ends and fittings to exactly match your radiator high and low pressure inlet and outlet.
Price: $129.95

Thermostat Housing
Product ID: ENG105
Thermostat Housing

This reproduction thermostat housing is made from a heat-treated stainless that will stay like new for many years. If you need to change the thermostat, it’s a welcomed improvement.

Comes with a new O-ring on the housing

Price: $30.00

160 Thermostat
Product ID: ENG106
160 Thermostat
1986-1987 Turbo Regal special 160-degree thermostat required by some of the aftermarket computer chips. This thermostat can be used with your stock computer chip enabling your car to run cooler. By lowering the engine temperature, you can gain more power. This will also cut down on the number of times that annoying electric fan will kick on as you shut your car off, since your engine will operate at a cooler temperature.

Because of its unique size, the 160-degree thermostat is NOT found in any auto parts stores. Most parts stores only carry the stock one. No gasket is required, and the original O-ring can be reused.

NOTE: This thermostat can effect emissions, so if local laws have emissions tests, it is not recommended.
Price: $16.95

Water Pump
Product ID: ENG-WP


ACDelco stock replacement water pump.

 Comes with gasket. Hardware not included

Price: $79.00

GN1 Intercooler Front Mount
Product ID: GN1_FMIC


This is a GN1Performance "EXTREME FRONT MOUNT INTERCOOLER" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. Its custom hand built aluminum front mount intercooler with the bar and plate core. This intercooler comes complete with all the aluminum pipes and hardware needed to put on your car today! The dimensions of this intercoolers core are 24x11x3, and from tank to tank is 30.5 inches in total length featuring 3" inlet and outlets. Tube sizes are all 3 inches in diameter and are mandrel bent aluminum pipes. This intercooler is light weight and good for up to 800hp. This intercooler has no turbo lag.
* Please specify when purchasing what size throttle body and what size your turbo outlet is so we can provide you with the correct hoses.
Price: $599.00

Aluminum Stock Up Pipe Replacement
Product ID: GN1-SUP


This is a GN1Performance "Stock Replacement Up Pipe" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This item is a great upgrade from the factory steel throttle body up pipe. It is polished 2.5" aluminum pipe and also comes with (2) 2.5 hoses and (4) heavy duty T-bolt clamps.

Price: $89.00

Silicone Transition Coupler
Product ID: HOS300


Race Proven 4 Ply Reducer Coupling! Designed for High Tempearture, High Boost Applications. Won't swell or burst under extreme conditions


Price: $0.00

Intercooler Shroud
Product ID: IC_Shroud


Stock intercooler shroud in good condition. No cracks.
Price: $100.00
Out of Stock

Turbo Intercooler Hose Set
Product ID: IC101


Set of three race proven 3" in-length silicone hoses for your STOCK turbo, intercooler and throttle body designed for high tempearture, high boost applications... in the color of your choice

Does not include hose clamps

Price: $28.00

Clamp Set
Product ID: IC102


Stainless steel T-bolt clamps for a stock IC, throttle body and turbo

2x 2" T-Bolt Clamp

4x 2.5" T-Bolt Clamp

Price: $29.95

Precision Stock Location Stretch Intercooler
Product ID: PIN053-2005
Precision Stock Location Stretch Intercooler

An excellent upgrade in performance for those wanting more from their stock location intercooler. Features bar and plate construction, which allows the use of higher boost pressure. This construction is also much more resistant to damage from road hazards than tube and fin designs. Comes with mandral bent aluminum up-pipe, aluminum shroud, hoses, clamps and mounting hardware needed for installation.

HP Rating: 750hp

Dimensions: 13" Length x 17 1/4" Height x 3" Depth
Inlet / Outlet: 3"

Please include size of throttle body and turbo outlet when ordering

Price: $999.99

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Jack Cotton's 8.90 @ 154MPH 1986 Buick