Thread: Engine kit question
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09-10-2005 09:47 PM #5
That seems very close to the kit I used for my 350 but are you sure you want that high C.R.? For strictly racing that would be good but if you plan to run on the street it is a bit high. In my case I had the heads "resurfaced" quite a bit to cc out at 73 cc and the best estimate I can get for my C.R. is 9.0:1 hoping to run on 87 octane or maybe 89. On the other hand there is not much percentage difference between $2.90/gallon and $3.20/gallon so if you have to run 93 octane that may not make much difference. One way to handle high C.R. is to use aluminum heads or set the squish close to about 0.030" by decking the block and careful machine work. Admittedly the Vortec heads are a cheap way to get good flow but they are iron so maybe someone else here on this Forum can tell you the correct directions to setting the squish to the optimum value. The tradeoff is that a closer approach of the top of a piston to the inside of the head the better turbulence and resistance to detonation, but if the piston pin and the bearings get a cumulative slop equal to the squish, the piston will destructively hit the inside of the head and great damage will occur. If you plan to do this check with Tech1 as to what is the safest squish to use and have the machine shop deck your block accordingly. The list of possible cams is vast and different folks have different preferences. My rough guess would be that you should look at Comp cams XE286 for all out performance, but a Comp Cams 268 might be better for the street. I also like the Crane cams low rpm street cams for torque (and mileage), but I don't really care about 1/4 mile E.T. I'll bet you get at least six different cam recommendations here before this thread is done!
Don Shillady
Retired Scientist/teen rodder





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