Not having much luck here
Does anyone have a HR or HK GMH Master Parts book they could look up these piston numbers for me please.
Part number 7430515 ( same as in previous post) .
They are in a 149 which has a 3 7/16th bore and are flat top pistons with this number stamped into them and look to be genuine Holden pistons.
A standard 149 has 3 1/4 inch bore so they are a fair bit oversize.I suspect they are an oversize 161 piston ( hence the HR/HK parts book info request to search for the number ) and I am interested to see exactly what pistons they are.
From my calculations my 149 is around 167 cubes now with these pistons and 3 inch stroke.
Any constructive help appreciated,
Terry.