Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec SHOshop 3.0 starting 12/9..

Originally posted by warmonger:

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Well, Vadim is full of [censored], and the guy porting the other stuff is right about the velocity, but at the expense of airflow volume at high rpm...the other part of the story! The valve mounting geometry is identical for the 3L and 2.5L!!!!!!
Hell you did half the hard part, deshrouding the 2.5L valves is only going to lower your compression.
Oh well, we'll see what the dyno puts down but basically you have created a 3L with 2.5L valves stuffed into it without the benefits of compression. You should see some good midrange torque, but who knows how well it will breath at the top.
Didn't the shoshop leave the heads as-is on their own project car? They made 228 wHP with high compression heads and 2.5L valves. If they do an identical job but just reduce compression then I can only expect their power to drop by about 15-20. Oh well, I don't want to detract from your project, and you will get a more powerfull car. So I'm sorry for ranting a little bit.

warmonger

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Well, I'm not sure about the deshrouding and stuff, I do know that the guy that did the P/P also decked the heads to clean up the surface. I don't know how much he decked, but I do know that since we have 91 octane here, I should be better off with a slight decrease in compression. And I didn't have the money to get 3.0 valves and have them installed. Plus, I thought it would be nice to see what a set of breathed on, 2.5L heads would do, since you've already accomplished the 3.0 valves.

As for SHOshop, the heads were Extrued-Honed, but stock, 2.5L valves. So, basically, I will have a copy of Vadim's SVT Contour, minus the SHM headers.

Originally posted by warmonger:

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Dion,

I'm sorry I jumped all over that post. It is actually very good to see some slightly different ways of making power. You guys may hit on something good there and I was trash talking it to quickly.
It looks like your combustion chambers weren't widened out as much as mine, they look a little smaller. If that is any guide you may have compression in the 10.3+ range, but surely not over 10.5:1.
I have to say that they did a nice job on the work, I just felt with the knowledge base that has accumulated over the last year and a half, it indicates that the 2.5L valves may limit the maximum potential of the motor.
Look at it this way though, you will have one hell of a platform for the vortech supercharger! That was another reason I was going with low compression in mine.
Good Luck,

warmonger

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I understand your frustrations, no harm/no foul. I know you're not happy with SHOshop, I know some people out here that aren't that happy with them either.
The chambers, from what I understand, were opened up to the gaskets. Which gaskets, I don't know, my assumption is they were opened up where you could see the gasket material stop on the heads (ie 2.5L gaskets). If it's limited by 2.5L valves, we'll find out in a month or so, after the car is broken in.
If the CR is indeed low enough, I may have to look into a Vortech as well. You've really peaked my interest in that option now....
One of the guys here, Jim Bandy, has over 9K on his SVT with an S/C, so I think the problems that Vortech encountered are almost over with.

Originally posted by drajen:

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shoshop is working on a 3.5l model for the svt models. I saw it in their catalog that they have. Anyone know anything more about it?

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Yes.

Don't bother with it.

Between the massive thinning of the cylinder walls required, need for a custom crank (huge money!) or possible grinding of the stock crank (another durability mistake!), and SHOShop's normally ridiculous prices ($2000 for "their" 3L shortblock when a brand new longblock from Ford is $1200 ) I would not even waste my time thinking about it.