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Old 04-24-2010, 11:43 PM
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shelby racer shelby racer is offline
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Join Date: Mar 2005
Location: Santa Cruz, ca
Cobra Make, Engine: Shelby CSX4788 with a Dawkins performance 490 ci iron genesis block hydrualic roller
Posts: 246
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Default 490 CI over square fe

Looking at all the initial posts helps to confirm why I went with large bore x short stroke motor for my cobra. Most of the long rod / long stroke stroker fe's out there are aimed at the heavy car set (galaxies, thunderbolts ....). VERY few people will ever be able to use all the big block torque down low in a light car like a cobra because we just can't hook it up. I am very lucky to have a local engine builder locally who sat down and discussed what my goals were. My background is road racing a fox body mustang that weighs about the same as my cobra (2,600#). I stared with a high CR 306 solid lifter with a 7,500 and moved to a lower CR hydraulic roller 342 that put out 370 ft # and 360 rwhp with a 6,000 red line. The added torque was great, but the longer rod and stroke caused increased side load = increased wear and frictional loss. Race motors are like most cobra motors - relatively low miles / year, but race motors are run hard A LOT of their life. If you are really using more than about 400 - 450 hp in a cobra, you are either crazy, live in a place with exceptional roads, no traffic and few cops or are driving it on the track- IMHO. That is my limited knowledge slant on strokers - YMMV.
John(;-)
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