383 piston in a 426 wedge???
#3195721
12/06/23 03:23 PM
12/06/23 03:23 PM
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God's Country Maryland
GODSCOUNTRY340
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I was wondering, since the 383 & 426 have the same bore diameter, could I put 440 rods on 383 pistons would they work in a 426 wedge engine?
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: 383 piston in a 426 wedge???
[Re: GODSCOUNTRY340]
#3195734
12/06/23 04:11 PM
12/06/23 04:11 PM
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Las Vegas, NV
chargerbr549
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No the 383 piston has too short of a compression height. I believe the 426 piston is probably around 2.030ish compression height and the 383 piston would be around the 1.900 compression height. Your compression ratio would probably be below 8 to 1.
Last edited by chargerbr549; 12/06/23 04:14 PM.
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Re: 383 piston in a 426 wedge???
[Re: chargerbr549]
#3195762
12/06/23 06:34 PM
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ruderunner
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And the RB rods are the same length so no gain there.
On the other hand, the MP stroker crank would work with the 383 pistons in a 426 block.
Angry white pureblood male
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Re: 383 piston in a 426 wedge???
[Re: chargerbr549]
#3195786
12/06/23 10:13 PM
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No the 383 piston has too short of a compression height. I believe the 426 piston is probably around 2.030ish compression height and the 383 piston would be around the 1.900 compression height. Your compression ratio would probably be below 8 to 1. Can you say blower motor? 
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
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A-Body's RULE!
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Re: 383 piston in a 426 wedge???
[Re: ruderunner]
#3195792
12/06/23 11:14 PM
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And the RB rods are the same length so no gain there.
On the other hand, the MP stroker crank would work with the 383 pistons in a 426 block. 440 rods are longer than 383 rods. 440rods are 6.768" and 383 rods are 6.358". I've got a 426 wedge block and an nos set of 383 11.5 TRW pistons, could work.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: 383 piston in a 426 wedge???
[Re: GODSCOUNTRY340]
#3195813
12/07/23 06:46 AM
12/07/23 06:46 AM
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ruderunner
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383 is a B engine, 440 and 426 are RB and have the same rod length. No gains with a 440 rod in a 426.
Angry white pureblood male
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Re: 383 piston in a 426 wedge???
[Re: GODSCOUNTRY340]
#3195833
12/07/23 09:47 AM
12/07/23 09:47 AM
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nowhere
Sniper
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And the RB rods are the same length so no gain there.
On the other hand, the MP stroker crank would work with the 383 pistons in a 426 block. 440 rods are longer than 383 rods. 440rods are 6.768" and 383 rods are 6.358". I've got a 426 wedge block and an nos set of 383 11.5 TRW pistons, could work. Nope. The 426 wedge is an RB motor, same rod length as the 440. Putting shorter 383 pistons on those rods will net you a low compression slug.
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Re: 383 piston in a 426 wedge???
[Re: GODSCOUNTRY340]
#3195843
12/07/23 10:26 AM
12/07/23 10:26 AM
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JohnRR
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And the RB rods are the same length so no gain there.
On the other hand, the MP stroker crank would work with the 383 pistons in a 426 block. 440 rods are longer than 383 rods. 440rods are 6.768" and 383 rods are 6.358". I've got a 426 wedge block and an nos set of 383 11.5 TRW pistons, could work. Yes that would work , you'd obviously not have 11.5 compression but it would be more than 7.5/8.0. What heads ? Not that it matters as you'd have no quench/squish what's so ever. It would be finicky and probably require a higher octane fuel. You could recoup some of the cost of a set of 426 spec pistons by selling those 383 pistons ...
running up my post count some more .
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Re: 383 piston in a 426 wedge???
[Re: ruderunner]
#3195924
12/07/23 04:33 PM
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383 is a B engine, 440 and 426 are RB and have the same rod length. No gains with a 440 rod in a 426. I know that, I'm talking about putting 440 rods onto 383 pistons and using them in a 426 block.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: 383 piston in a 426 wedge???
[Re: chargerbr549]
#3195991
12/07/23 10:18 PM
12/07/23 10:18 PM
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That might work to use those domed TRW 383 pistons in the 426 block and have a decent compression ratio. Another area to look out for is when doing piston swaps like that is the piston to counterweight clearance, I believe the 361/383/400 cranks have a smaller counterweight diameter compared to the larger 413/426/440 counterweights so those pistons might come pretty close to the counterweights. The longer rod would cover any problem like that. With the TRW 2293 and the heads at 80 CCs and a steel shim the comp would be approx 9.3, not worth the trouble IMO.
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Re: 383 piston in a 426 wedge???
[Re: Scully]
#3196140
12/08/23 07:08 PM
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cudaman1969
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A lot of misconception here dudes, like said 383 rod is 6.38 or so, 426 rod is 6.76. Deck height on a 383 is around 9.98, 426 is 10.72. SO using a long 426-440 rod in a 383 will stick the piston OUT of the deck about .400. The 383 and 440 piston are close on compression height. NOw if you want some bump stick the 426 piston in a 383, roughly .170 difference.
Last edited by cudaman1969; 12/08/23 07:16 PM.
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Re: 383 piston in a 426 wedge???
[Re: cudaman1969]
#3196652
12/11/23 11:45 AM
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JohnRR
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NOw if you want some bump stick the 426 piston in a 383, roughly .170 difference. What pistons are you talking about and with what head , the 68-69 335HP pistons sits .0025 in the hole on a stock 9.98 deck height ?
running up my post count some more .
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Re: 383 piston in a 426 wedge???
[Re: JohnRR]
#3196830
12/11/23 09:36 PM
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cudaman1969
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NOw if you want some bump stick the 426 piston in a 383, roughly .170 difference. What pistons are you talking about and with what head , the 68-69 335HP pistons sits .0025 in the hole on a stock 9.98 deck height ? .245 deck height difference between the 2 if both pistons were zero deck height. 1.93 is zero on a 383, shortest high block piston is more than that.
Last edited by cudaman1969; 12/11/23 09:38 PM.
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