# A question about Poly 318s
**URL:** https://59plymouth.net/t/a-question-about-poly-318s/3195
**Category:** Tech Support
**Created:** [November 10, 2018, 2:49am UTC](https://59plymouth.net/t/a-question-about-poly-318s/3195 "2018-11-10T02:49:46Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Faulkner](https://59plymouth.net/u/Faulkner)
#### Post date: [November 10, 2018, 2:49am UTC](https://59plymouth.net/t/a-question-about-poly-318s/3195/1 "2018-11-10T02:49:46Z")
I received an inquiry from a Plymouth Owners Club member, about an engine being offered for sale. It’s got the scalloped valve covers that are the hallmark of Polys - here’s the information he emailed:
> [@POC Member](#):
>
> On block in front of and below left head FLP8-072978
> Casting number in front of and below right head 1737929
> The engine and intake are painted silver with black valve covers.
I’ve read that the casting number was shared among a number of displacements with the same block - just, different strokes and bores. But I understand from [here](http://clubs.hemmings.com/goldenfin/58fury.html), that the stamp indicates a '58 318. Does anyone have a differing opinion, or additional information? And, were the Fury 318’s, different than the standard 318’s in 1958 - and if so, in what way?
BTW - Faulkner’s 318, which I bought from eBay represented as a '58 block, is stamped with LP8 + a serial number.
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### Author:  [@RICKYMOPAR](https://59plymouth.net/u/RICKYMOPAR)
#### Post date: [November 11, 2018, 4:03pm UTC](https://59plymouth.net/t/a-question-about-poly-318s/3195/2 "2018-11-11T16:03:29Z")
**FLP** is the prefix for the 1958 Fury A engine. Special Fury 318 engine included re-curved dual point distributor, mechanical camshaft and dual four-barrel WCFB carburetors.
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### Author:  [@Mark\_Merritt](https://59plymouth.net/u/Mark_Merritt)
#### Post date: [November 11, 2018, 9:01pm UTC](https://59plymouth.net/t/a-question-about-poly-318s/3195/3 "2018-11-11T21:01:02Z")
Dan: for what it is worth my Fury has the original motor and I think the car was made in June 59. The left side stamp is MP8326478 the casting # on the other side reads 737929 with A #2 above the numbers. I did not see A #1 starting at the beginning. Mine is the 318 with 2 barrel. Mark
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### Author:  [@Faulkner](https://59plymouth.net/u/Faulkner)
#### Post date: [November 12, 2018, 2:35am UTC](https://59plymouth.net/t/a-question-about-poly-318s/3195/4 "2018-11-12T02:35:51Z")
> [@Mark Merritt](#):
>
> Dan: for what it is worth my Fury has the original motor and I think the car was made in June 59. The left side stamp is MP8326478 the casting # on the other side reads 737929 with A #2 above the numbers. I did not see A #1 starting at the beginning. Mine is the 318 with 2 barrel.
Mother MoPar, in her inimitable fashion! I suspect a 2-737929 block is the same as a 1737929 block, just a year later 😒 Thanks for the info, Mark.
> [@RICKYMOPAR](#):
>
> **FLP** is the prefix for the 1958 Fury A engine. Special Fury 318 engine included re-curved dual point distributor, mechanical camshaft and dual four-barrel WCFB carburetors.
Thanks, Rick - and apparently also a higher compression - 9.25:1 (according to the POC member who contacted me, but also corroborated by Bernie Brouillet). The “F” in the “FLP” is the difference.
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### Author:  [@RICKYMOPAR](https://59plymouth.net/u/RICKYMOPAR)
#### Post date: [November 13, 2018, 1:50am UTC](https://59plymouth.net/t/a-question-about-poly-318s/3195/5 "2018-11-13T01:50:31Z")
Yes 9.25 CR but .75 less than the optional 350CID B engine.
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### Author:  [@Faulkner](https://59plymouth.net/u/Faulkner)
#### Post date: [November 13, 2018, 2:26am UTC](https://59plymouth.net/t/a-question-about-poly-318s/3195/6 "2018-11-13T02:26:26Z")
You know your numbers Rick! the GC 361… (_sigh_.) It would be nice.