What piston is this L2350 ?
#3157003
07/04/23 07:12 PM
07/04/23 07:12 PM
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God's Country Maryland
GODSCOUNTRY340
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Just acquired a 1970 383 HP engine, pulled the 906 heads and found .030 over pistons with L2350 stamped in them. I checked google with no help. Anyone know what compression these pistons are claimed to be?
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: What piston is this L2350 ?
[Re: topside]
#3157044
07/04/23 10:04 PM
07/04/23 10:04 PM
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GomangoCuda
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Is that an old KB piston # ? Sounds familiar.
I looked on their site, and their part #s have changed, so the current 4.280-bore 383 part is UEM-KB210-030.
Nope. 50+ year old Trw/Speedpro forged Pistons. Compression will likely be pretty low. I might have an old Speedpro catalog in the shop. I will look tomorrow. Edit: now that I think about it, might be a Trw/Speedpro cast stock replacement piston. Flat top, no valve notch, terrible compression ht. Might get 8:1 probably less.
Last edited by GomangoCuda; 07/04/23 11:35 PM.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: What piston is this L2350 ?
[Re: GODSCOUNTRY340]
#3157134
07/05/23 10:08 AM
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fredericksburg,va
cudaman1969
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1.93 compression height
9.98 deck height
6.387 rod
3.387 stroke -1/2 is 1.69
9.98 - 6.387 - 1.69 = 1.89 so .042 above deck
Last edited by cudaman1969; 07/05/23 10:09 AM.
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Re: What piston is this L2350 ?
[Re: GODSCOUNTRY340]
#3157242
07/05/23 02:46 PM
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JohnRR
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Just acquired a 1970 383 HP engine, pulled the 906 heads and found .030 over pistons with L2350 stamped in them. I checked google with no help. Anyone know what compression these pistons are claimed to be? If they don't appear to be zero deck , the 2315 is about .020 in the hole , tallest replacement available , your compression is near 8.0 with a 906 not cut much..
running up my post count some more .
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Re: What piston is this L2350 ?
[Re: cudaman1969]
#3157245
07/05/23 02:51 PM
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1.93 compression height
9.98 deck height
6.387 rod
3.387 stroke -1/2 is 1.69
9.98 - 6.387 - 1.69 = 1.89 so .042 above deck I think you meant BELOW ???? ... that's even above the bloated NHRA spec of .021 above the deck , there wasn't a 383 built for production passenger cars or trucks with a positive deck height piston . Some of your specs are incorrect , stroke for the 383 is 3.375 , 400 is 3.38 68-69 383 HP and 2bbl with a dish pistons are 1.932 , on a blueprint deck these pistons sit .0025 in the hole , that's the tallest B 383 CH piston.
Last edited by JohnRR; 07/06/23 04:42 PM. Reason: correct piston CH
running up my post count some more .
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Re: What piston is this L2350 ?
[Re: GODSCOUNTRY340]
#3157246
07/05/23 02:53 PM
07/05/23 02:53 PM
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JohnRR
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Anyone know the compression height for the 383 magnum engine? What year ? 68-69 are 1.932 I do not know if 70 is the same ?
Last edited by JohnRR; 07/06/23 04:41 PM. Reason: wrong piston CH spec
running up my post count some more .
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Re: What piston is this L2350 ?
[Re: lewtot184]
#3157272
07/05/23 04:19 PM
07/05/23 04:19 PM
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God's Country Maryland
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anyway number could have been mis-read? there is a 2315 383 Not mis-read, definitely L2350.
Last edited by GODSCOUNTRY340; 07/06/23 11:53 AM. Reason: pic
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: What piston is this L2350 ?
[Re: GODSCOUNTRY340]
#3157299
07/05/23 05:56 PM
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So. Burlington, Vt.
fast68plymouth
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1.93 compression height
9.98 deck height
6.387 rod
3.387 stroke -1/2 is 1.69
9.98 - 6.387 - 1.69 = 1.89 so .042 above deck
Stock stroke is actually 3.375”, and the correct rod length is 6.358”
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: What piston is this L2350 ?
[Re: JohnRR]
#3157489
07/06/23 11:38 AM
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fredericksburg,va
cudaman1969
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1.93 compression height
9.98 deck height
6.387 rod
3.387 stroke -1/2 is 1.69
9.98 - 6.387 - 1.69 = 1.89 so .042 above deck I think you meant BELOW ???? ... that's even above the bloated NHRA spec of .021 above the deck , there wasn't a 383 built for production passenger cars or trucks with a positive deck height piston . Some of your specs are incorrect , stroke for the 383 is 3.375 , 400 is 3.38 68-69 383 HP and 2bbl with a dish pistons are 1.925 , on a blueprint deck these pistons sit .0025 in the hole , that's the tallest B 383 CH piston. 383 and 400 are the same, but I wrote some numbers down wrong, do the math. 1.925 plus rod length plus half the stroke (1.6875) then compare to deck height of 9.98. Still 9.9825 I went online to get those specs, I’ll re check them
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Re: What piston is this L2350 ?
[Re: fast68plymouth]
#3157492
07/06/23 11:42 AM
07/06/23 11:42 AM
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fredericksburg,va
cudaman1969
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1.93 compression height
9.98 deck height
6.387 rod
3.387 stroke -1/2 is 1.69
9.98 - 6.387 - 1.69 = 1.89 so .042 above deck
Stock stroke is actually 3.375”, and the correct rod length is 6.358” Brain fade, looking at the numbers AND still wrote down wrong! lol
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Re: What piston is this L2350 ?
[Re: cudaman1969]
#3157495
07/06/23 11:54 AM
07/06/23 11:54 AM
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Weddington, N.C.
Streetwize
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or... if you shave them about .050 and put them in a 426W block with a 4.15 crank and 6.76" rods you can make a low buck 478" RB
Last edited by Streetwize; 07/06/23 11:55 AM.
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Re: What piston is this L2350 ?
[Re: Streetwize]
#3157579
07/06/23 03:44 PM
07/06/23 03:44 PM
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GomangoCuda
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I found where Trw said that all L2000 series are forged and if it ends with an F it has floating pins.
Someone on FABO ID'd these as - 70-71 383 2 barrel (non HP) 1.863 compression height.
I have not yet been able to confirm this.
The L2315F Pistons that they still sell have 1.92 compression height.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: What piston is this L2350 ?
[Re: cudaman1969]
#3157609
07/06/23 04:44 PM
07/06/23 04:44 PM
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JohnRR
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1.93 compression height
9.98 deck height
6.387 rod
3.387 stroke -1/2 is 1.69
9.98 - 6.387 - 1.69 = 1.89 so .042 above deck I think you meant BELOW ???? ... that's even above the bloated NHRA spec of .021 above the deck , there wasn't a 383 built for production passenger cars or trucks with a positive deck height piston . Some of your specs are incorrect , stroke for the 383 is 3.375 , 400 is 3.38 68-69 383 HP and 2bbl with a dish pistons are 1.932 , on a blueprint deck these pistons sit .0025 in the hole , that's the tallest B 383 CH piston. 383 and 400 are the same, but I wrote some numbers down wrong, do the math. 1.925 plus rod length plus half the stroke (1.6875) then compare to deck height of 9.98. Still 9.9825 I went online to get those specs, I’ll re check them My piston spec was wrong , corrected. I'm pretty sure the 400 crank has that .005 longer stroke, it's a cast crank so it's not the same crank as the 383 .
running up my post count some more .
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Re: What piston is this L2350 ?
[Re: GomangoCuda]
#3157612
07/06/23 04:46 PM
07/06/23 04:46 PM
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Joined: Jan 2003
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JohnRR
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I found where Trw said that all L2000 series are forged and if it ends with an F it has floating pins.
Someone on FABO ID'd these as - 70-71 383 2 barrel (non HP) 1.863 compression height.
I have not yet been able to confirm this.
The L2315F Pistons that they still sell have 1.92 compression height. That is the tallest available aftermarket 383 piston , sold I believe as an NHRA replacement , it's as heavy as a stock cast piston except it's forged.
running up my post count some more .
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