Capacity and compression ratio increase

[jagwit]

Also thinking of changing the diff ratio, currently 3.54, to either 3.31 or 3.07, the latter would maybe make the OD too long? Do u still have the 3.31 that u swapped out?

Yep, I still have the 3.31. Thought I would need it in my Chev C10 project if I end up fitting a jag front and rear suspension.

I use this web site for all my ratio calculations:
https://www.ashcroft-transmissions.co.u ... _calc.html

3.54 diff & 215/70/15 tyres
your car will do 3300rpm at 120km/h in top (1:1)
With o/d (0.8 ratio) it will do 2640rpm when in o/d.

3.07 diff & 215/70/15 tyres
your car will do 2860rpm at 120km/h in top (1:1)
With o/d (0.8 ratio) it will do 2300rpm when in o/d.