What spacer combination is best?

[MACE]

triple b,

In regards to ideal spacer combo's Trayner has perfectly summed it up well

well depends , are you ever going to supercharge your car?

If your going to stay N/A
go

- MACE 25mm Manifold Insulator
- MACE 12mm Plenum Spacer

and other way for supercharged

In your case if you already have a 12mm manifold insulator I wouldn't worry about upgrading to a 25mm item (unless you wanted the best possible gains), instead sticking with the 12mm plenum spacer.

Hope this helps

Cheers,
Steve

 

[triple b]

alrite cheers steve, a 12mm plenum spacer it is and then a little bit further down the track a new set of roller rockers

 

[Full Spectrum]

yeah i noticed this but if you look underneath them they have a black material which i believe is there for sound deadening... however it holds the heat in like a bitch too
i took it off to change leads and spark plugs and havent even thought of putting it back on... some reason id rather look at my engine than bits of plastic with engine sticking out

After reading your comments I'm going out to remove it now.. Maybe in time I will paint the lid make it look good lol.