Oct. 10, 2022

The NHRA Technical Department recently made changes to the blueprint specifications.

                    GM 1981 corrected piston cc to match all 305 dish specs

                    Pont 88-90 corrected CR to match all 305 dish piston specs

Correct piston cc to match all 305 dish piston specs

Corrected intake casting

Added alternate cylinder head

Pont 89 corrected valve sizes 305 and 350

GM 91-92 – corrected dish depth to match TI form

Corrected piston cc to match all 305 dish piston specs.