pistons!! grrrr. need help - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 4 Old 08-29-2007, 05:57 PM Thread Starter
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pistons!! grrrr. need help

my block is in the machine shop now and they need the pistons to bore it 30 over.. im looking at waht to buy and kind of confused, im getting speed pro cause of money situation.. i have aluminum heads, 66mm air to air turbo kit, roller rockers, aeromotive fuel system, 42# ers. just trying to get the short block ready, i dont know if i should go with flat top 4 or 2 valve reliefs, dome?? whats the best and whats the difference???
i was going to go with summit part number trw-8kl2482f30...

good ???

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post #2 of 4 Old 08-29-2007, 06:16 PM
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im running these; TRW-L2305F30 will put me at 8.5-8.6:1 compression ratio.

yours are fine also.


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post #3 of 4 Old 08-30-2007, 09:33 AM
 
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Go with what piston allows you to keep the compression around 9.0:1 or a little less. I went with an SRP dished piston with a set of AFR heads with 61cc chambers. Those combined with my headgasket allowed me to come out at 8.9:1 compression ratio. I would not go over 9.5:1 if you plan on running some decent boost. Any brand of piston you go with should give you estimates of your compression ratio if you use their piston, just match the closest one with the CC size of your cylinder heads and you will be fine. Of course how much lift on your cam can affect piston to valve clearance, but usually anything around .512 lift or less using about a .040" gasket can be "assumed" to be fine, but always checking is a priority.

Dished pistons usually lowers compression, flat top most of the time will put you at a compression close to stock, and domed usually increase compression (mostly a heavily modified N/A engine uses these).
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post #4 of 4 Old 08-31-2007, 09:24 PM Thread Starter
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im using the f303 supercharger cam

Camshaft, Hydraulic Roller Tappet, Advertised Duration 288/ 288, Lift .512/ .512, Ford, Small Block,
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