GM, Chevrolet Big Block Cylinder Head.
This sale is for 1 Cylinder Head.
Casting number3993820
Build date code D2971
Displacement, 6.5L, 396 CID & 7.5L, 454 CID
Years of production,
1971 - **** 402 CID
1965 - 1972 6.5L, 396 CID Vin *
1975 - **** 7.5L, 454 CID Vin L
1976 - 1979 7.5L, 454 CID Vin S
1980 - 1986 7.5L, 454 CID Vin W
1976 - 1978 7.5L, 454 CID Vin Y
1970 - 1975 7.5L 454 CID Vin Z
Information was provided by AERA Cylinder Head & Block Manual
AERA Engine Rebuilders Association
This Cylinder Head is completely rebuilt to GM/Chevrolet Specifications.
Our pride is your best insurance in receiving the quality you expect. All work is done on our premises and starts with a complete tear-down and thorough inspection of every head entering our shop. After a complete evaluation of all components, it\'s on to our state-of-the-art, 3-Step thermal cleaning system and magnafluxing; followed by our unique pressure testing tank which checks for final hidden cracks and imperfections. At this point, the head enters the second stage of our high tech machine shop where ASE certified machinists and technicians handle the precision stages of restoration to ensure you of superior workmanship and quality every time. CBN resurfacing is performed to eliminate the possibility of head warpage. Valve seats are triple angle high performance cut. Each valve is machine dressed at the stem and face, conforming with OEM specs. All springs are tension tested, and worn rocker studs are replaced when necessary. In addition new freeze plugs, pollution plugs, valve keepers and valve seals are installed. The cylinder head is then vacuum tested to ensure proper seating of all valves. Specifications and technical updates are readily available with our AERA data program. This information is utilized during the remanufacturing process to ensure accuracy at all times. Only after a final inspection are heads stamped with an inspectors stamp, packed and shelf stored in our climate controlled inventory area. All this and more, linked with the courteous and friendly service you receive equals the pride put into the quality you deserve.

Questions :
Please contact our Tech Department
J & H Diesel Truck Service Inc. & Machine Shop
ASE Certified Repair Facility since 1980
941-366-3047, 941-374-3680 or thru Please visit our store
If this product or any product we sell needs to be shipped over night express, contact us for arrangements, and we will get it done.Thank you,
Harry & Heather..

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