| Re: HEADS
Tim, could be he didn't get a good tune on that motor and it let go. Simply putting a pulley on, while that is basically all anyone says, is only 25% of the story. The rest lies in dyno work and changing the MAF tables etc. to arrive at proper A/F. There is plently of fueling capacity in the truck (and the GT) to make a lot more power but cranking the boost with a pulley and nothing else is a receipe for disaster.
Most people don't run much more than 14lbs or so without doing some other upgrades. The valve springs are only good for about 20-22lbs, after which the boost will blow and hold them open - not good. 22lbs of boost on a circle over 2" in diameter produces good pressure!
The serious Lightning freaks use the Lysholm screw blowers and run 20-25lbs of boost with upgraded rods, ported heads, etc. and make big numbers that start with 7s and 8s. And, for the money, it isn't that expensive for a 10s truck as it can be done with the cost of a truck and under 10-12k $. MM&FF got their GT in the 10s with slicks, I'm sure much more can be had with increases in boost etc.
R |