I am not that familliar with the dimensions of the Quad 4 pistons, but you don't want to mess up the quench. You can mess with the other side, but the quench area is cruicial to helping manage and eliminating pinging. Typically around 0.040". Alum rods increases that by around 0.040 to 0.080. And if it has 4 valve relief's, are they in the correct position for the 4.9L? Same with N* pistons. BEing the 4.9L shares pistons with the 3.4L Chevy V6, pistons and rings should be plentiful and cheap. Sick puppies like me read websites like KB-Silvolite.com. It is interesting to find out what works with what...
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Originally Posted by stickpony yeah thats cool.. to lower the compression, youd want to get some quad-4 pistons, they fit and will give you about 9:1, of course getting some head work done will lower it slightly more, 8.6-7 to 1, thereabouts.. I woudl HIGHLY recommend geting LT1 1.94 in. intake valves for this when you get the head work done.. get new exhaust valves too
but for a 12 valve 6 cyl 3.8 buick...order them new |