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The Chevy pistons are set up for 5.7 inch rods, while the VW (1.7) is set at 5 inches, so the offset will be different. 100' and they held up well until I ran the nitrous lean and it caved in the dome on a few pistons.Guys will often fly cut a small amount out of the pistons with. Opinions expressed are solely my own and do not express the views or opinions of my employer. Not all pistons can be fly cut,It always weakens the piston at least a little.How much you can remove depends on how thick that area of the piston is and how strong the piston is.I took a set of TRW smallblock pistons and fly cut them. The big unknown for me relates to rod length. Do the work yourself is the only way to get things done right. The pistons varied hugely in how deep they were in the bore (a bad sign) one.
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Use the collet and some feeler gauges to set the depth for the. Everything You Need to Know to Build Any VW-based Dune Buggy Yourself.
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Once you figure out how deep you need to go on the first piston. With the Chevy pistons I'd be right at 8.5:1.If I use the Chevy pistons at 4.060, I would need to hone the cylinders very slightly to clearance the pistons properly. I would start by taking the first cut about 1/3 as deep as the stock valve relief. Get a valve 0.060' larger in diameter, superglue course emery paper to its face, Piston at tdc, gasket on, use heads as angle guides and go slow with the cordless drill, works nicely. The compression height is around 0.100 inch shorter than the Arias pistons, but for my application this is almost ideal, as the heads have been flycut to give 11.5:1 C.R. If you mean notching, you can do it yourself. 017 inch smaller than the 24mm VW pin size)should work fine. Yes the pin diameter is smaller, but new bushings honed to an appropriate diameter (it's only. Jegs has Keith Black hypereutectic pistons for a Chevy 327 for around $20 apiece. Do yourself and your wallet a favor Fix the weak link before You need to replace your. I have a set of 103's with Arias forged pistons-very noisy and they blow oil when cold, so I'm researching putting in a more streetable set of pistons. If you want it all 'perfect', you will have to set up the geometry again. Fly-cutting the head will change the rocker arm geometry slightly. I've been doing a little research on this myself. If the head has been cut too many times, it will hit the top fin of the cylinder before it actually seats on the top of the cylinder.