# pinging

**URL:** https://59plymouth.net/t/pinging/2826
**Category:** Tech Support
**Created:** [October 3, 2016, 10:24pm UTC](https://59plymouth.net/t/pinging/2826 "2016-10-03T22:24:03Z")
**Posts on this page:** 6
**Page:** 1

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### Author: ![LEONARD](https://59plymouth.net/letter_avatar_proxy/v4/letter/l/a6a055/32.png) [@LEONARD](https://59plymouth.net/u/LEONARD)
#### Post date: [October 3, 2016, 10:24pm UTC](https://59plymouth.net/t/pinging/2826/1 "2016-10-03T22:24:03Z")

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We overhauled my 230 engine it runs and sounds really good until get to 60 mph. The timing is correct got a new vacuum advance,took dist all apart everything looks perfect. A thought i have is, the machine shop decked the block and milled the head. The head had been milled before because when i got the car it had a blown head gasket. My thought is the compression is changed to much. Does anyone have any advice on this? Thanks.

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### Author: ![big\_m](https://59plymouth.net/user_avatar/59plymouth.net/big_m/32/16_2.png) [@big\_m](https://59plymouth.net/u/big_m)
#### Post date: [October 4, 2016, 3:15pm UTC](https://59plymouth.net/t/pinging/2826/2 "2016-10-04T15:15:31Z")

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There’s a good chance that the compression ratio change could be causing the pre-ignition. Try a higher octane fuel, if that doesn’t help, retard the timing some. Pinging will eventually harm the engine if it persists.

—John

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### Author: ![LEONARD](https://59plymouth.net/letter_avatar_proxy/v4/letter/l/a6a055/32.png) [@LEONARD](https://59plymouth.net/u/LEONARD)
#### Post date: [October 4, 2016, 6:45pm UTC](https://59plymouth.net/t/pinging/2826/3 "2016-10-04T18:45:35Z")

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Thanks John, i tried prem. fuel but problem still there. Is there a shim or possible 2 head gaskets may fix it?

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### Author: ![big\_m](https://59plymouth.net/user_avatar/59plymouth.net/big_m/32/16_2.png) [@big\_m](https://59plymouth.net/u/big_m)
#### Post date: [October 5, 2016, 3:54pm UTC](https://59plymouth.net/t/pinging/2826/4 "2016-10-05T15:54:52Z")

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2 head gaskets may lower the ratio enough to help, but retarding the timing slightly would be my first direction.

—John

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### Author: ![RICKYMOPAR](https://59plymouth.net/user_avatar/59plymouth.net/rickymopar/32/35_2.png) [@RICKYMOPAR](https://59plymouth.net/u/RICKYMOPAR)
#### Post date: [October 5, 2016, 4:50pm UTC](https://59plymouth.net/t/pinging/2826/5 "2016-10-05T16:50:34Z")

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I would now try disconnecting the vacuum advance and see if eliminates the ping. With L head engines it is hard to increase the compression to a point that premium fuel would not help,

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### Author: ![big\_m](https://59plymouth.net/user_avatar/59plymouth.net/big_m/32/16_2.png) [@big\_m](https://59plymouth.net/u/big_m)
#### Post date: [October 5, 2016, 6:56pm UTC](https://59plymouth.net/t/pinging/2826/6 "2016-10-05T18:56:23Z")

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Great advice! It’s entirely possible you’re getting too much advance, or earlier than you should.