HuD 91gt Posted November 3, 2015 Share Posted November 3, 2015 Hello, I currently have my P90 head under the knife. I am attempting my first port and polish job. Currently unshrouded the valves, blended the seats into runners, as well as polished the chambers. I'll be smoothing out the runners here shortly without doing any reshaping. Although, I did slightly smooth out the metal around the valve guide on the exhaust side only. I currently have Colt Cams up here in Vancouver BC grinding away on a cam for me. I've purchased the Schneider springs/retainers from MSA and have yet to decide if I will run the outers only, and stock inners or run the whole setup. TBD.Next up is a new set of valves. I just got off the phone with SI valves in California and they no longer stock their swirl polished valves in the P90/P79 lengths. He mentioned people who generally need that, are already replacing all the valve train and it is all adjustable. He still stocks the OEM stainless units. The only swirl polished unit's he stocks are the shorter version from the earlier heads. I am not shaving the head any large amount as this will be used in a turbo charged application.I honestly can't fathom what is adjustable in the head other then large amount of valve guide being ground away. What am I missing, and can I use the shorter valves in my application?Secondly, I've searched and searched and SI valves was the only place I found who made valves for the P90. Anyone know of any other options? Cheers Quote Link to comment Share on other sites More sharing options...
Xnke Posted November 3, 2015 Share Posted November 3, 2015 You could try it, but it's going to remove a lot of your cam base circle to get the geometry correct. You will also need lash pads. You can get Ferrea to make you any valve you like. Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted November 3, 2015 Author Share Posted November 3, 2015 Ok that's what I thought. Custom valves or go OEM. Thanks for the input. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted November 3, 2015 Share Posted November 3, 2015 I've done a lot of valve research lately. It looks like a Toyota 20r valve may be an option for the p90 in a +1mm. All the other dimensions are identical but I'm unsure about the lock groove. That's not really a big concern though. Quote Link to comment Share on other sites More sharing options...
1vicissitude Posted November 3, 2015 Share Posted November 3, 2015 (edited) Just wanted to point out, you have something backwards. The p90/p79 are the short valve heads, hence why when they are shaved and cam tower shims are used you install the longer valves. Ferrera still makes the shorter valves you need. Edited November 5, 2015 by 1vicissitude Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted November 3, 2015 Author Share Posted November 3, 2015 Thanks for the correction. Makes sense. Quote Link to comment Share on other sites More sharing options...
SHADY280 Posted November 3, 2015 Share Posted November 3, 2015 Hud I'm local to you as well. I run one of Jeff's cams in my car. There is a local guy named zoltan. Look for him out here in the valley. He is a wizard with heads and flow as well as sourcing valve parts Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted November 3, 2015 Author Share Posted November 3, 2015 Pm'd Quote Link to comment Share on other sites More sharing options...
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