1966 427/425 valve springs

[John P.]

Hello, Can anyone give me replacement part numbers for 3970627 valve springs and 3964264 retainers? I know these are discontinued at Chevrolet, however I thought that someone may have updated numbers or cross reference numbers to an aftermarket supplier. If anyone has a set of 16 of these for sale, please contact me. Thank you so much in advance for any and all help, John

[Leif A.]

Re: 1966 427/425 valve springs

NAPA sells the Federal Mogul Sealed Power brand. Valve Spring part #VS-708 ($6.30 ea) and the Valve Spring Retainer part #VK-138A ($0.63ea).

[William F.]

Re: 1966 427/425 valve springs

Are these part numbers specific for the high performance 425 hp 427 or do they also apply to the 390 hp 427?

[John P.]

Re: 1966 427/425 valve springs

Hello William, The numbers I posted are specific to the 427/425 SHPE with solid lifters. Thank you, John

[Duke W.]

Re: 1966 427/425 valve springs

The ...627 dual spring assembly with integral retainer and seal was OE on all Corvette big blocks, except L-88 and ZL-1, beginning around 1969 and through '72, and was the service assembly for the earlier single spring/damper design that had a tendency to break, especially on the higher revving mechanical lifter engines.

The '73-'74 Corvette big blocks went back to a single spring/damper, 353075, but those were lower revving engines.

...data from the 9/77 P&A catalog.

Duke