Jump to content

Bored R3!


mfg

Recommended Posts

8 minutes ago, r1lark said:

False. The 0.093" overbored 289s were the 304 engines.

Return trivia question -- what did the Granatelli's do  to get 299 cubic inches out of the 289?

False is Correct!...as to your question, the owners of 63R-1025 say Andy 'adjusted' the crankshaft stroke to gain the extra cubes, and also to increase low end torque.

Link to comment
Share on other sites

22 minutes ago, mfg said:

False is Correct!...as to your question, the owners of 63R-1025 say Andy 'adjusted' the crankshaft stroke to gain the extra cubes, and also to increase low end torque.

OK, I wasn't sure. I thought it was just less overbore, like 0.060" or so.

Link to comment
Share on other sites

Yup. In a phone call to my father, Andy G. confirmed a stroke increase from 3 5/8" to 3 3/4" in engine RS1021, and that it was the only stroked R3.

Standard 289 --> 299 practice was to use 0.060" in overbore.

Link to comment
Share on other sites

1 hour ago, GeoffC312 said:

Yup. In a phone call to my father, Andy G. confirmed a stroke increase from 3 5/8" to 3 3/4" in engine RS1021, and that it was the only stroked R3.

Standard 289 --> 299 practice was to use 0.060" in overbore.

A very unique Avanti engine indeed!

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...