That is impossible without truely knowing your combo, and it's state of tune. A dyno run can help you greatly in determining how well your car is running, and if done right, about what you have for power. They usually aren't more than $100-200.
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Where should i set my timing?
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A dyno tune will tell you that. The most common way of getting extra power out of the engine is to run premium fuel and advance the timing until you get mild preignition, or generally to about 14* or so. If you ping, set it back a couple degree's.
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Stock block48000miles, Start on top,Cobra up and lo intake 75mm bbk throtle body 65 mm mass afm, K/N af, Svo Alu Heads ? size,aftermarket CAM? on size,roller rockers,alu griffin radaitor,under drive pulleys, mallory ING and coil,BBK headers,Offroad H pipe ,Flowmasters. it also has 3.73 gears and ADO with shift kit
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Reverse your MAF and T/B. You more than likely have a 65mm BBK Throttle body and a 75mm MAF. GT-40 alumium heads can come in a few different flavors.
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if any one can guess abou the 1/4 mile times
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Can't tell you without knowing your combo. Right now we don't know the kind of heads you have, the cam, the torque converter, the rocker size, or the shift kit in the tranny.
It does sound like many of the parts have been wisely chosen, and if the previous owner followed suit with the unknowns, you probably have a very nice streetable car that will suprise a good deal of other performance vehicles on the road should you drive it well.
