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Performer centerbolt cylinder heads are 50-state street legal and accept factory centerbolt valve covers
1975-1978 GMC C15 CID 283
Hidden thermostat bypass and heater hose ports with NPT line adapters included
Highly Efficient Fuel Charge
One Duck-Foot Pick-Up With Fuel Trap and Filter
Hushmat Ultra Door Kit Heat and Sound Barrier 12 x 12" Sheet 1/8" Thick Rubber - Silver 35453SMLBK Performer centerbolt cylinder heads areHushMat makes your door slam solid and insulates your vehicle for both noise and heat. Reduce road noise and vibrations that make your vehicle noisy. Hushmat produces specialized rubber insulation. This insulation not only insulates your vehicle from the heat of the road but also reduces unwanted vibration and noise. #1 Rated HushMat provides incredible sound reduction and thermal insulation benefits from technology proven for over a quarter of a