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Technical JE Pistons #174 ??? Ever seen these?

Discussion in 'The Hokey Ass Message Board' started by Byers, Apr 22, 2015.

  1. Byers
    Joined: Sep 9, 2014
    Posts: 68


    I have an old Pontiac 389 Drag Motor from the 60's. She has these big 'chrome dome' pistons. Looks like whoever got them, polished the top of the pistons or that's how they came from JE back in the day. If anyone knows anything more about them, let me know. Just thought they were kind of cool:

  2. I'll bet they were polished to relieve stress risers and keep them from carboning up so bad. I have seen pistons with polished tops but have yet to see a set that came that way.
    Byers likes this.
  3. aaggie
    Joined: Nov 21, 2009
    Posts: 2,531


    I used to polish the pistons when I built race engines and after awhile I realized they melted and blew up just like the others. If it makes you feel good then go for it but very little gain.
    Byers likes this.
  4. spinout
    Joined: Jan 15, 2008
    Posts: 333

    from Dallas, TX

    I've heard of this. It's supposed to make available slightly more surface area. Sorta like drag "slicks."
    Byers likes this.

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