Hello all,
I've got a big valve head (standard,44mm inlet etc) on the bench, from an early 70's 200 series,non injection, and I want to clean it up, polish the ports, improve the flow etc..but I vaguely remember reading that grinding out these heads has to be carefully done so as not to actually have a detrimental effect on performance..
What do I need to avoid in there, and what should I aim for? I am not going to go mad, just smooth out a bit, sort the rough castings etc..I am as much interested in smoothness and economy as power. I have done it on a few heads before, mainly minis, and once on a b20a head, and there was always an improvement..what's so different about these volvo heads that I must avoid?
Thanks all for your help..always appreciated.
best,
Dave White