1966 Riviera 425 nailhead

can anyone tell me the compression ratio of a 425 nailhead for '66?

 

I believe it's 10 .25 -1

 

Never trust "I believe" or people who are believing in something...

But it's 10.25:1 for sure :TU:

:laugh: :bglasses: :laugh: :bglasses: :laugh:

 

LOL Just when I'm SURE of something, is when I'm DEAD WRONG. Ask My fiance'
The " I believe" just covers my :moonu:

 

Advertised as 10.25 to one. Closer to 9.5 to one in reality.

Cheryl

 

I heard it's 10.25 if you use the steel shim head gaskets.........but less if you use the thicker "permatorque" ones.

9.5 is fine by me, I prefer to use the cheep gas anyway :grin:

 

cr

Beleive what nail head in a 67 tells you. advertised 10.25 to1, reality about 9.75 to 1 with thin steel head gaskets IF the heads havent been milled a bunch. Less with the thick gaskets. Thats why I dont worry about the cat pee gas. p if the eng was a 2 bbl eng with 9.5 advertised ,eaven less. :laugh:

 

Let all the wannabee's do their calculations again and again, and after all this mess with the big boys.... ou: