[cyn4561]

I have 2 x G13a engines to make
one for my mg410.

one engine has dished pistons
with a g13a head.

the other engine has flat top pistons
and a G16 head.
It appears both engines are Std bore.

The flat top pistons appear serviceable.
Are they ok to use with the g13a head??
could I use any combination of the above??

thx.

[fordem]

I've run flat topped high compression pistons in what is known as the G13BA (in a SF413 Swift), this uses, as far as I know, the same cylinder head that would have been used on the G13a (Samurai/Sierra), so I don't see think you sould need to be concerned about valve/piston contact, if that's what you're asking about.

[cyn4561]

Thx That was one concern.
The other being Compression Ratio and use of 91Ron fuel.

Cheers
Greg

[fordem]

I can't really address the fuel side of it, back then, we only had one grade of fuel, equivalent of "super unleaded", which I think translates to 98Ron, but, my guess is you'll need at least 95Ron.