1) For Small Block Chevy 283 302 305 327 350 383 & 400 V8 engines up to 1986.

2) Spark Plug Style: Straight

3) Style: Bare

4) Material: Aluminum

5) Finish: Natural

6) Combustion Chamber Volume: 64cc

7) Intake Runner Volume: 200cc

8) Exhaust Runner Volume: 74cc

9) Intake Valve Diameter: 2.020"

10) Exhaust Valve Diameter: 1.600"

11) Valve Stem Diameter: 0.3438"

12) Intake Port Shape: Rectangle

13) Intake Port Location: Standard

14) Exhaust Port Shape: Square

15) Exhaust Port Location: Standard

16) Intake Valve Angle: 23 deg.

17) Exhaust Valve Angle: 23 deg.

18) Valve Seat Machine Style: 3-Angle

19) Valve Seat Material: Ductile Iron

20) Valve Cover Mounting Style: Center & Perimeter Bolt

21) Pre-drilled accessory bolt holes.

22) High-grade aluminum, bronze valve guides, hardened seats, and advanced port design for greater airflow.

23) Package Includes: As shown in our pictures.

This Item Doesn't Come With Installation Guides. We Highly Recommend Professional Installation.