cleaning up the slant six head

1930 said
After looking into this the consensus seems that without a flow bench doing much of any work other than port matching could be detrimental to the performance of the head.

It would take someone with the bench and some spare heads to cut a little and then test, cut a bit more and continue with test ect. Even some areas that may look like problem areas may in fact help the flow of the heads because they cause patterns within combustion chamber that help flow.

Not trying to discourage anyone but installing the larger valves appears to be a full out race thing only/higher RPM deal. Not ideal for any kind of street use.

Since the head was originally designed for the smaller engine it will not breathe to full capacity unless it were opened up but again from what I have read ( or not read if referring to slant heads ) no-one has taken the time to do the leg work and document findings.

V-8s more info than one could ask for. Slant engine...just alot of guys cutting and hoping for the best and assuming they made improvements but no real data to prove it.

I plan to clean up my heads still but will not be removing any major material from chamber/bowl area. Will post things though as I go along.

wrong... Where is bill when you need him with the chevy ??302?? and the slant comparison. They share the same cylinder volume and the valve sizes are way different. As I keep saying slants have a problem getting air in, not out, the exhaust port can be ported as far as the intake. You need to get a bigger valve in to increase cylinder fill and therefore increase VE=MPG/HP/TQ. Now on a stocker build I think adding JUST the 1.7 intake and then cleaning up the head would have great results. As far as porting unless you hit water on these ifs going to be better than stock, yes you can open them up to much and hurt flow, but as I stated over and over a gasket match and deep bowl cut, then blending is going to be MILES ahead of stock. You do what ever you want but don't state that info isn't out there as you lead other people down the wrong path.

Chambers, read my last post, relieve the valves to unshroud them and mill to needed CC's for compression. This isn't hard. If your worried about screwing it up put an ad out here for a head work (wild may pick it up but havn't seen him in awhile or even IQ52, Brian, lots of pro's on here) or take it to your local shop and tell them I want a gasket match and bowl work, pay the money and be happy...

But don't say it hasn't been done well or that we are pissing in the wind... A lot of work goes into our motor's and your going to step on the toes of the people trying to help...