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Questions on 350 Rebuild
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Harpo
Posted 2018-07-28 11:08 AM (#567334)
Subject: Questions on 350 Rebuild


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Posts: 1

Hi all, I have a complete L 350 and Powerflite from a 58 Lancer that I'm going to rebuild and I'm wondering if 350 owners overbore or just hone and re ring. A .060" overbore can use standard 361 pistons but does this hurt the value if I decide to sell it. Later today I'll run my dial bore gauge through the cylinders and check the amount of wear, there is very little ridge which is surprising. I have a Golden Commando Mani, linkage and correct carbs from a 58 Fury that I bought in 72 for 10 dollars and may top it off with that. I own a complete engine machine shop and specialize in Mopar drag engines so this will be done right but if I can keep it standard bore I think it's the better choice. Any opinions on the value of a complete turn key rebuilt L 350 with Golden Commando carbs and mani would be appreciated. Thanks for any replies.
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57chizler
Posted 2018-07-28 5:06 PM (#567337 - in reply to #567334)
Subject: RE: Questions on 350 Rebuild



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Welcome to the board.

Whether or not to rebore is a tough choice, they're standard bore only once. I'm a big fan of reaming the ridge, scuffing the bore and reusing the original pistons if still serviceable. You'll be down a few horsepower compared to a perfect bore.
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mstrug
Posted 2018-07-29 9:56 AM (#567367 - in reply to #567334)
Subject: Re: Questions on 350 Rebuild



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The 361 and the 350 in 1958 shared the block. They were stamped L360 for the 361 and L-350 for the 350. So an over bore wouldn't be completely not' stock'. I've seen some .030"/.040" over and /stock 361 pistons on ebay too.

350

The 350 cu in (5.7 L) B engine was, along with the 361, the first production B engine, first available in 1958. It had a bore of 4.06 in (103 mm). The 350 is classified as a big block engine. All parts except for the pistons are fully compatible with the 361.

361

The 361 cu in (5.9 L) B engine also introduced in 1958 was essentially the same as the 350 except with a larger 4 1/8-inch (100 mm) bore. In 1964, the Dodge Polara 500 came standard with a 315 bhp (235 kW) version of the 361 that had a four-barrel carburetor, dual-point distributor, and dual exhausts. Plymouth called their versions of the early B engine the Commando, variants of which included the Golden Commando and Sonoramic Commando. It produced 305 bhp (227 kW). DeSoto's B engine was named Turboflash and produced 295 bhp (220 kW). The Dodge standard version was a 2-barrel with 295 bhp (220 kW) called the Super Red Ram with an optional variant that was called the D500 and produced 320 bhp (240 kW).

The 361 would last until the end of the series, albeit for trucks only. In its early years, the 305-horsepower 361 was optional on many vehicles, and standard on, among others, the Dodge 880. The 361 had a fuel injected version in 1958 only.[1] Very few of fuel injected B engines were made, and only a handful—at most—remain since most were brought back to the dealer to be fitted with carburetors.

https://en.wikipedia.org/wiki/Chrysler_B_engine
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Mopar1
Posted 2018-07-29 11:50 AM (#567369 - in reply to #567367)
Subject: Re: Questions on 350 Rebuild



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Location: N.W. Fla.
I like as thick a wall as possible. Wear will determine if & what overbore is required. Overbore won't hurt value unless you go for a max overbore.
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Shep
Posted 2018-07-29 8:31 PM (#567386 - in reply to #567369)
Subject: Re: Questions on 350 Rebuild



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Location: Chestertown, NY ( near Lake George)
The right way to do this is to measure the bore taper, and maximum bore size, using the shop manual you can determine the need for an overbore, not done properly, it can lead to both possible engine noise, poorly seated rings and oil consumption.
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57plybel
Posted 2018-07-29 10:48 PM (#567393 - in reply to #567334)
Subject: RE: Questions on 350 Rebuild



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Location: Melbourne, Australia

NORS 350 pistons - stock bore are relatively obtainable, oversize ones are the hard to get ones.... took me years to find +0.040" oversize....

I'm currently piecing together one that is 0.0825" oversize (361 + 0.020 o'size)    I bought it machined but unassembled so it will be a good test to see if it runs hot or fails short term.

Some of my older mopar buddies told me of scrapping their 361's as they were already too thin from factory back in the day; especially after striking water jackets during the machining process.

I can only conclude that there was core shift affecting some blocks but not all as there plenty of survivors still running strong.

As stated by others, machining is not always necessary.... cleanup and re use if possible.

 

 

Colin

 

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wayfarer
Posted 2018-07-30 10:29 AM (#567419 - in reply to #567393)
Subject: RE: Questions on 350 Rebuild



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Location: Central Ory-Gun
57plybel - 2018-07-29 7:48 PM

NORS 350 pistons - stock bore are relatively obtainable, oversize ones are the hard to get ones.... took me years to find +0.040" oversize....

I'm currently piecing together one that is 0.0825" oversize (361 + 0.020 o'size)    I bought it machined but unassembled so it will be a good test to see if it runs hot or fails short term.

Some of my older mopar buddies told me of scrapping their 361's as they were already too thin from factory back in the day; especially after striking water jackets during the machining process.

I can only conclude that there was core shift affecting some blocks but not all as there plenty of survivors still running strong.

As stated by others, machining is not always necessary.... cleanup and re use if possible.

 

 

Colin

 



I'd suggest measuring the walls before putting any effort or money into that block.
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57chizler
Posted 2018-07-30 2:03 PM (#567433 - in reply to #567419)
Subject: RE: Questions on 350 Rebuild



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Location: NorCal
I agree, an ultrasonic thickness test should be performed before any major overbores are attempted.

I have never accepted the notion that the factory made larger bore engines by simply overboring an existing casting.
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