What is the last year for a small Journal crankshaft 327 or 350?
10-28-2016, 04:17 PM
#1
Drifting
Thread Starter
What is the last year for a small Journal crankshaft 327 or 350?
What is the last year for a small Journal crankshaft 327? Did 350 ever come with a small Journal crankshaft?
10-28-2016, 04:39 PM
#2
1967 was the last year for the small journal 327, 350 never had small journal
10-28-2016, 04:42 PM
#3
Drifting
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Thanks
10-28-2016, 08:31 PM
#5
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Nope! Sorry. 2.10 rods/2.45 mains.
'67 302 retained the small journals. 2.0/2.30.
'67 302 retained the small journals. 2.0/2.30.
10-28-2016, 09:33 PM
#6
Thanks, Gary in N.Y.
P.S. I would add this also with that particular 350" only, it retained the S/J rod bolts (11/32") and the rods were "dimpled", similar to the 7/16" BB rods. Here's a shot of those SB rods. If you look closely you can see the 1/2" nut used on the center (L/J) rod!
10-28-2016, 10:26 PM
#7
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The 67 ONLY 350 was a one of a kind engine (ONLY in an SS350 Camaro). As mentioned, it did in fact have the large journal crank, unique rods and a "hybrid" block. The block had a combination of 67-earlier and 68-later features. I wish I had 10 of those blocks!
11-06-2016, 01:35 AM
#8
Drifting
Interestingly, the 3892657 SJ 327 came from the factory with the main bearing tangs already machined for the LJ main bearing size. This makes it super-easy to convert any SJ 327 block to an LJ 350.
Note that the 3892657 SJ 327 casting was used in zillions of Camaros and passenger cars, so these block are not particularly rare. And, they all have the rear crankcase vent that went away staring in 1968. This vent makes is easy to retain the unvented valve covers used in pre-68 small blocks.
11-06-2016, 10:33 AM
#9
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Absolutely correct, 1967 Camaro, 350" L/J platform!
Thanks, Gary in N.Y.
P.S. I would add this also with that particular 350" only, it retained the S/J rod bolts (11/32") and the rods were "dimpled", similar to the 7/16" BB rods. Here's a shot of those SB rods. If you look closely you can see the 1/2" nut used on the center (L/J) rod!
Thanks, Gary in N.Y.
P.S. I would add this also with that particular 350" only, it retained the S/J rod bolts (11/32") and the rods were "dimpled", similar to the 7/16" BB rods. Here's a shot of those SB rods. If you look closely you can see the 1/2" nut used on the center (L/J) rod!
Duke
11-06-2016, 10:38 AM
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In 1967, GM used the 3892657 block casting for both the small-journal 327 and also their very first 350, the large-journal 350 used in the Camaro RS. The only difference was how the main journals were machined.
Interestingly, the 3892657 SJ 327 came from the factory with the main bearing tangs already machined for the LJ main bearing size. This makes it super-easy to convert any SJ 327 block to an LJ 350.
Note that the 3892657 SJ 327 casting was used in zillions of Camaros and passenger cars, so these block are not particularly rare. And, they all have the rear crankcase vent that went away staring in 1968. This vent makes is easy to retain the unvented valve covers used in pre-68 small blocks.
Interestingly, the 3892657 SJ 327 came from the factory with the main bearing tangs already machined for the LJ main bearing size. This makes it super-easy to convert any SJ 327 block to an LJ 350.
Note that the 3892657 SJ 327 casting was used in zillions of Camaros and passenger cars, so these block are not particularly rare. And, they all have the rear crankcase vent that went away staring in 1968. This vent makes is easy to retain the unvented valve covers used in pre-68 small blocks.
For example, this will permit building a NICE 383 for your 56 or 57 Chevy, retain all the original EXTERNAL features (INCLUDING staggered bolt pattern valve covers------------if you know a good cast iron welder) and have a stock looking (283) engine that runs like stink.
Last edited by DZAUTO; 11-06-2016 at 04:28 PM.
11-06-2016, 10:56 AM
#11
Thanks, Gary in N.Y.
P.S. Back in the time frame when these were very common, the fact that the Camaro rod (L/J) still had smaller (11/32") rod bolts caused many on the "outside" to believe that this 350" was actually a S/J 350". We heard this numerous times back then! Once we spotted that "dimple" under the pin eye we knew immediately the platform we had.
11-06-2016, 11:11 AM
#12
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What DZ said. I have an old school 383 in my '61 that was built 35 years ago out of a '67 block, and it looks stock. I intend to rebuild it again when the time comes just to retain the original appearance under the hood. Crate motors don't have this feature, unfortunately. Here's a photo from when it was almost ready to get back on the road after a 20+ year nap by the P.O.......looks like a 283, but doesn't run like one!