BB Valve Cover Bolt Source?

[Ralph B.]

66 JM calls for recessed 7/16 hex-head RBW bolts.

So far only able to find these with 3/8 hex-heads.

Would you know any sources that may carry the 7/16 size?

Thank you,
Ralph

[Mark D.]

Re: BB Valve Cover Bolt Source?

Are you wanting assembly line original or a reproduction?

Richard Fortier for reproduction (and some original)

Rich Pasqualone for original

[Michael H.]

Re: BB Valve Cover Bolt Source?

Ralph,

The head size and design will depend on the build time of the engine. Early production 66 used the same as 65, a 3/8" hex countersunk head screw. Later engines used a 7/16" hex conventional head screw.

I don't know exactly when the change occurred but I think it was somewhere around the middle of the model year.

For the 7/16" head design screw, there were a few different suppliers. RBW was not the only one.

[Keith B.]

Re: BB Valve Cover Bolt Source?

LIC sells the correct ones along with Paragon

[Ralph B.]

Re: BB Valve Cover Bolt Source?

LIC sells the correct ones along with Paragon

Keith the ones LIC list for the 66 427 is P/N 22-23F --------- I asked him via e-mail and he specified the head was 3/8 hex.
I haven't checked with Paragon as of yet?
Thank you!

[Matt L.]

Re: BB Valve Cover Bolt Source?

66 vette exhaust clamps 816.jpgRalph,
here are mine. they are TR 7/16. my engine build date is april 1.
take care,
Matt

[Ralph B.]

Re: BB Valve Cover Bolt Source?

Ralph,

The head size and design will depend on the build time of the engine. Early production 66 used the same as 65, a 3/8" hex countersunk head screw. Later engines used a 7/16" hex conventional head screw.

I don't know exactly when the change occurred but I think it was somewhere around the middle of the model year.

For the 7/16" head design screw, there were a few different suppliers. RBW was not the only one.

Thank you Michael ---- I have an early car and decided to stay with the existing 3/8 hex RBW recessed head bolts. Ralph