You can use a thicker headgasket to lower compression, but its a **** way to do it, it messes with combustion chamber d ynamics, quench ect. 2) Use a center punch with a good OD finish (available for cheap at most production tool stores, like J&L Industrial) through the guide and put dimple marks in the valve pockets. 16v gze pistons can work, but you might have to flycut them for the extra valve. 1) Put the pistons in the bore at TDC (each one) with enough masking tape on the ring land area to keep the piston centered in the bore. engine with the original 77 mm cylinders and pistons and you've got yourself a. Rods from gze are same as in 20v, but not the same as BT. Refer to the cam and piston chapters for details on deck height and valve. Rods are the same length, 20v and black top can handle small amounts of boost. Since I dont have room to prep a track car this winter I might as well get started on the block. HELP, Does any one know where I can get my pistons fly cut in the car That is close to Muscatine, IA I have new heads and cam to install on my dads car. Since I dont have room to prep a track car this winter I might as well get started on the block. Lastly, does anyone know of any parts that are manufactured to make the 20V boost friendly? I think HKS made a 8.0mm headgasket for the 16V, wondering if anyone makes something similar for 20V? ![]() If none of the above is possible, I simply want to know what the contributing factors are to making the 16V GZE "lower compression" other than the pistons themselves. I'm assuming the pistons from 16V are not interchangeable with 20V, confirm/deny? What about the rods from 16V? will they work with the 20V crank, if so then the 16V GZE pistons can be used in 20V correct? My personal experience with them was a snapped ring and chipped piston but Im quite sure it was down to the engine builder not the pistons themselves. Do they have shorter rods too, or is length the same as standard 16V, I know this would effect displacement, so I doubt it? (I heard somwhere they are stronger though)? I'm assuming their also might be a larger headgasket, can someone confirm/deny this for me? Record the measurements that you get in the area you are wanting to cut. You need a bare P-51 head as a guide and need to check the piston thickness in the area that you will be cutting AND the pistons must be in the block (short block). Someone help me out here on the tool source, I don't remember. Walk your piston in between the indicator and the punch. There's also a cutting tool that you can get and then cut the notches yourself. ![]() ![]() Make sure every thing is solid and repeats '0' when cycled. you can get there, but I doubt many of the 520 RWHP cars can troll along in 1st gear at 1000 rpm in stop and go traffic. Position the indicator so that the tip touches the tip of the punch. Ok, so to the best of my knowledge the 16V GZE motors are capable of handling boost because of their lower compression pistons. With some head work, a healthy cam, FAST intake, flycut pistons, etc. Noob questions follow, proceed with caution.
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