Originally posted by warmonger:
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




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.

dion 98 SVT, 200 whp/190 lb. ft tq (tuned by ADC), 3.0, P&P heads w/2.5L valves, optimized TB, MSDS, SCA 2.5" catback, SHOshop UIM/LIM, underdrive pulley set, TD's, Koni/H&R, BAER/TCE, Progress, CF1 products