R5 Alpine head modification

[Robert]

Hello Guy,

Find attached pictures about a head of an Renault 5 Alpine. Is it possible you give me a a priori recommendation on the work to do on it to improve flow ? Of course you have no flowbench trials to validate your answer (humour)...
My suggestion is based on the reading of your different books, you can edit a picture and post it back to show where you should intervene...
It seems the SSR of the exhaust demands more work than intake.

Thank you very much,

Robert

[Guy Croft]

You are not far off there, treat as I would the Fiat twin-cam, shape is very similar. Same goes for valve angles.

G

[Robert]

Thanks Guy. May be we will avoid to remove metal in the exhaust guide area.

Robert

[Guy Croft]

Yes, you need to be careful on the outboard side of the ex valve guide boss - if you make it too thin it may shear when the guide is pressed in.


G