Obviously on the head

Gains if any?

Chat away......

from a few posts i think it helps reducing smoke??

Only I've got spare one (see for sale section )

Polishing does nothing, costs more and can actually lose power.

You should concentrate on manifold matching, chamber volume balancing, port volume matching and cross-sectional uniformity, throat radii and get the valves back-cut and quality three-angle valve seats done.

After that increase inlet valve sizes whenever possible and open the inlet ports up a little, leave the exhaust valves and ports alone.

Job jobbed.

Might get the dremel out lol

Polishing does nothing, costs more and can actually lose power.

You should concentrate on manifold matching, chamber volume balancing, port volume matching and cross-sectional uniformity, throat radii and get the valves back-cut and quality three-angle valve seats done.

After that increase inlet valve sizes whenever possible and open the inlet ports up a little, leave the exhaust valves and ports alone.

Job jobbed.

i agree with all of this

did you just make that up? lol just kidding :yes:

Jabba did good work on my head (twice! ) and it definitely breathes better. Standard head will choke at about 240bhp once all other methods of increasing power have been tried. Cam might help a bit on stock head though.

Jabba did good work on my head (twice! ) and it definitely breathes better. Standard head will choke at about 240bhp once all other methods of increasing power have been tried. Cam might help a bit on stock head though.

ISTR you had 1 mm (?) bigger exhaust valves fitted?