Heron Pistons and Larger Valves

[Alan Kramer]

Anyone know the part numbers for "Heron" pistons?  They were used in the 
european 1.6L VW's with the completely flat bottomed heads...   They came in 
79.5mm diameter and are now a hot item for VW guys to put in 1.7L VW 8v 
motors (whose cylinders appear to be dimensionally identical to 2144cc WE 
code I-5's) to increase the CR up to 9.2:1.

Also, does anyone know if larger valves can be fitted into the 2144cc 
engine?  From what I remember last time I looked at the head, I thought I 
could go 2mm larger on the intake.  True?  I figure finding valves of larger 
diameter in 98.7mm length might be difficult...

I'm trying to find a few more horses in my new motor and pistons and valve 
size are the only two things I haven't touched yet...the site shows what 
I've done so far.

Thanks,
Alan

'83 CGT   http://www.geocities.com/audikramer
'86 4kcsq
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