69 350 Engine ID - Page 2 - Chevelle Tech
Engine General Engine Discussion.

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post #16 of 26 (permalink) Old Jan 28th, 19, 6:31 AM
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Re: 69 350 Engine ID

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Originally Posted by RSMCEWOOD View Post
Von, yes it has a 12 bolt, Ill explore what the numbers there tell me tommorow...wish I had a lift
Thank you. I suspected all LM1's got a 12 bolt. I knew the 250 hp L65 2 bbl 350 got a 10 bolt with auto trans unless equipped with F40 HD susp. (All F40 cars got a 12 bolt, even 6 cyl.) I'm guessing yours isn't equipped with F40 but could you please verify on your build sheet? I'm still not sure if L65 2 bbl with manual trans Chevelles without F40 got a 12 bolt or 10 bolt. Chevelles being heavier than Camaros could've been a tipping point. Published factory '69 Chevelle specs are inaccurate since they call for all automatic 350 4 bbl cars (LM1 and L48) to get a 10 bolt which has been proven time and again to be wrong by existing originally equipped non F40 vehicles. The published factory specs don't list the L65 since it was a mid year addition, just show the LM1 and L48 350's. My guess is that the mid year replacement of the 4 bbl LM1 by the 2 bbl L65 was done to allow a lower cost first step up from the std 307 V8. Not only in the carb cost but in lower cost driveline components as well.

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post #17 of 26 (permalink) Old Jan 28th, 19, 11:03 AM
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Re: 69 350 Engine ID

I believe all L65 2 bbl cars came with 10 bolts as i have owned several of them.They were all equipped that way except my 72 malibu factory 350 4bbl auto with a/c came with a 12 bolt. i did recently own a 69 chevelle 4 door 307 car that had a 12 bolt in it but it was ordered with F40 suspension which justified it
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post #18 of 26 (permalink) Old Jan 28th, 19, 4:50 PM
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Re: 69 350 Engine ID

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Originally Posted by malibuss67 View Post
I believe all L65 2 bbl cars came with 10 bolts as i have owned several of them.They were all equipped that way except my 72 malibu factory 350 4bbl auto with a/c came with a 12 bolt. i did recently own a 69 chevelle 4 door 307 car that had a 12 bolt in it but it was ordered with F40 suspension which justified it
Thanks. Did any of your L65 cars have a manual trans? Did your L65's have 5/16" or 3/8" fuel lines?

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post #19 of 26 (permalink) Old Jan 28th, 19, 5:58 PM
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Re: 69 350 Engine ID

Yes von I also had a 1972 malibu 350 L65 2BBL factory 4 speed with posi rear. it was equipped with a saginaw 4 speed trans and a 10 bolt posi 336 gear. I still have the window sticker and build sheet kicking around here somewhere.

I am unsure of the fuel line sizes but most likely 3/8
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post #20 of 26 (permalink) Old Jan 28th, 19, 6:42 PM
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Re: 69 350 Engine ID

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LM1 350 255 HP 4 BBL.
Isn't that a pretty low gross hp rating for a 350 4 bbl of the time? I remember my mother's '68 cutlass had a 350 2 bbl olds in it, and it was rated at 250 hp. I think other 2 bbl 350's of the time were all right around there. Did chevrolet perhaps under rate that particular engine for some reason?
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post #21 of 26 (permalink) Old Jan 28th, 19, 7:08 PM
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Re: 69 350 Engine ID

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Isn't that a pretty low gross hp rating for a 350 4 bbl of the time? I remember my mother's '68 cutlass had a 350 2 bbl olds in it, and it was rated at 250 hp. I think other 2 bbl 350's of the time were all right around there. Did chevrolet perhaps under rate that particular engine for some reason?
Don't know why the low rating but it was a very popular engine for NHRA Stock and Super Stock racers then, especially in Camaros. Back then NHRA mostly went by factory rating numbers in their hp to weight class calculations. It probably would've been more accurately rated at around 270 hp or so. I believe NHRA now rates it at in the area of 280 hp for class calculations.

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post #22 of 26 (permalink) Old Jan 28th, 19, 7:11 PM
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Re: 69 350 Engine ID

Ah, that makes sense. Seems like all the manufacturers had engines around that time that were underrated for some reason or another. 340 mopars come to mind, buick stage I 455's, and a bunch of others.
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post #23 of 26 (permalink) Old Jan 28th, 19, 8:39 PM Thread Starter
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Re: 69 350 Engine ID

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Originally Posted by von View Post
Thank you. I suspected all LM1's got a 12 bolt. I knew the 250 hp L65 2 bbl 350 got a 10 bolt with auto trans unless equipped with F40 HD susp. (All F40 cars got a 12 bolt, even 6 cyl.) I'm guessing yours isn't equipped with F40 but could you please verify on your build sheet?...
Looking at the build sheet I dont see F40 the only suspension things I see are F62 and G32 front and rear springs which I cannot locate on option sheets, any idea?
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post #24 of 26 (permalink) Old Jan 28th, 19, 9:05 PM
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Re: 69 350 Engine ID

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Originally Posted by RSMCEWOOD View Post
Looking at the build sheet I dont see F40 the only suspension things I see are F62 and G32 front and rear springs which I cannot locate on option sheets, any idea?
Your car is a factory LM1 which comes with a 12 bolt so you didnt have to order F40 suspension to get it.

How bout some pictures of this beauty? I also have a granny lemans blue black vinyl top 69 malibu in my stall
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post #25 of 26 (permalink) Old Jan 28th, 19, 10:30 PM Thread Starter
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Re: 69 350 Engine ID

and the differential tells me it is
CN 0211B
CN 2.56:1 ~ 12-bolt (L48/350-4 & LM1/350-4)* built Feb11 in Buffalo
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post #26 of 26 (permalink) Old Jan 28th, 19, 11:04 PM Thread Starter
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Re: 69 350 Engine ID

There is a few in my Garage, lost the first set off my phone transferring them to the computer (maybe there still here floating around the WWW). I have asked the Original Owners if they have some "Old Days" photos they would give me of when it was new...or newer. Its about half tore apart in the garage now. Cheers
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