Re: 440 rods in 383?
[Re: JohnRR]
#3171433
08/29/23 05:48 PM
08/29/23 05:48 PM
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Joined: May 2012
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John Brown
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South Bend
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But if I was using an LY or similar oem rod with a 1.09 pressed pin, i would definitely do the old Landy trick and whack 1/2" off the pin and save about 50 grams per slug. you're gonna have to re-balance anyway so why not take out weight instead of add it back? Something like that never even crossed my mind ... now I'm going to have to take the 383 that Dan did for me apart ... Have to use Delrin plugs or the like to keep the pins where they belong after shortening the pins?
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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Re: 440 rods in 383?
[Re: John Brown]
#3171459
08/29/23 06:57 PM
08/29/23 06:57 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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But if I was using an LY or similar oem rod with a 1.09 pressed pin, i would definitely do the old Landy trick and whack 1/2" off the pin and save about 50 grams per slug. you're gonna have to re-balance anyway so why not take out weight instead of add it back? Something like that never even crossed my mind ... now I'm going to have to take the 383 that Dan did for me apart ... Have to use Delrin plugs or the like to keep the pins where they belong after shortening the pins? The more modern solution would be to get some thin wall pins that match your pistons required length. Too short of a pin puts too much load and stress on a part of the piston it is not designed to take.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 440 rods in 383?
[Re: HotRodDave]
#3171474
08/29/23 08:10 PM
08/29/23 08:10 PM
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Joined: Mar 2011
Posts: 3,076 Michigan
A727Tflite
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But if I was using an LY or similar oem rod with a 1.09 pressed pin, i would definitely do the old Landy trick and whack 1/2" off the pin and save about 50 grams per slug. you're gonna have to re-balance anyway so why not take out weight instead of add it back? Something like that never even crossed my mind ... now I'm going to have to take the 383 that Dan did for me apart ... Have to use Delrin plugs or the like to keep the pins where they belong after shortening the pins? The more modern solution would be to get some thin wall pins that match your pistons required length. Too short of a pin puts too much load and stress on a part of the piston it is not designed to take. Any part of the pin sticking out past the pin tier adds virtually nothing to pin or piston durability. Thin pins actually put more load in to the pin tiers. New pistons designed for thin pins are reinforced in this area. Taking a production piston and installing thin pins in will eventually crack the pin tiers. Only a matter of time and cycles.
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Re: 440 rods in 383?
[Re: JohnRR]
#3171479
08/29/23 08:31 PM
08/29/23 08:31 PM
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Joined: Jan 2004
Posts: 8,271 fredericksburg,va
cudaman1969
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I’d bore the main bores out to 440 size, more crank choices out there That's a bad move in a 383 block , the main webbing is already paper thin. I’ll check that but doubt it
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Re: 440 rods in 383?
[Re: Scully]
#3171606
08/30/23 11:56 AM
08/30/23 11:56 AM
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Joined: Jan 2003
Posts: 75,017 U.S.S.A.
JohnRR
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Standard bore 1.93 CH 440 pistons with 383 Eagle rods are your best bet for a street cruiser, all that other stuff is a waste of money. The longer rod ratio will only hurt the low end torque as well as the V to P clearance. Bore of the 383 is 4.250 , 440 is 4.320 , that's .070 over , sonic checker is your friend ...
running up my post count some more .
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Re: 440 rods in 383?
[Re: cudaman1969]
#3171607
08/30/23 12:00 PM
08/30/23 12:00 PM
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Joined: Jan 2003
Posts: 75,017 U.S.S.A.
JohnRR
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I’d bore the main bores out to 440 size, more crank choices out there That's a bad move in a 383 block , the main webbing is already paper thin. I’ll check that but doubt it look at this ... linky
running up my post count some more .
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Re: 440 rods in 383?
[Re: A727Tflite]
#3171629
08/30/23 01:05 PM
08/30/23 01:05 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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Nobody is talking about pin sticking out past the piston, anything sticking out past the piston is useless and should be removed and it is only possible on pressed pistons, we're talking about floating pins and others have mentioned even putting something between the end of the shorter pin and the clip...
A modern high strength thin wall pin if sized properly can flex less than an ancient heavy stock pin. If you run one made of tin foil that is on you.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 440 rods in 383?
[Re: JohnRR]
#3171993
09/01/23 01:44 AM
09/01/23 01:44 AM
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Joined: Feb 2016
Posts: 201 PA
Scully
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Standard bore 1.93 CH 440 pistons with 383 Eagle rods are your best bet for a street cruiser, all that other stuff is a waste of money. The longer rod ratio will only hurt the low end torque as well as the V to P clearance. Bore of the 383 is 4.250 , 440 is 4.320 , that's .070 over , sonic checker is your friend ... I've done many of them, the extra .005" per side over a .060" over isn't going to make any difference. I have a sonic tester and I haven't bored one yet that was anywhere near the danger zone, I'm sure there are some thin ones but I've never run across them and think they are probably the exception..
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Re: 440 rods in 383?
[Re: 69dart]
#3174401
09/11/23 12:59 PM
09/11/23 12:59 PM
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Posts: 75,017 U.S.S.A.
JohnRR
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Great Timing!
I have a smoked 383 crank with a decent block and was thinking about having it turned down to 2.2 rods to use BB Chevy rods. I had a 458 back in the day that used BB Chevy 6.80 rods and 1.32 pistons to get all the compression in a 400 block. That engine ran great.
I noticed BB Chevy pistons had the right bore for a 383 but wasnt sure if it would work. I can hear my engine builder now...lol.
I would love to hear more about this if some has tried it. I have the Enginemasters crank with 6.7 rods and 1.32 pistons. The 1.32 pistons can be used with a number of different stroke/ rod combos. works wit ha 3.75 stroke , 3.9 stroke and a 4.25 stroke. I'm thinking of upping the stroke on the 383 stroker I'm doing now to 4.25 , just need a 6.535 rod. The one issue you may have is the valve reliefs on the BB chevy piston may not work with your wedge head mopar configuration , might be easier to just buy a mopar piston.
running up my post count some more .
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Re: 440 rods in 383?
[Re: Streetwize]
#3174461
09/11/23 03:47 PM
09/11/23 03:47 PM
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Joined: Jan 2003
Posts: 75,017 U.S.S.A.
JohnRR
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I looooong time ago I had a stroked 383 (440 Crank) built from a low compression 454 chevy truck piston and a LY rod bushed to .990.
I'm thinking the compression height was 1.4 something.
We did all kinds of crazy Frankenstein stuff back in the day....because we had to.
But that little '383' (431) ran stout with a Racer Brown cam and a street dominator and some ported 915's. I don't think we had any P/V issues The math says zero deck would be 1.337 , I'm finding pistons with a 1.395 CH and a single valve relief in a weird spot. logged in the memory bank for future use ???
Last edited by JohnRR; 09/11/23 03:54 PM.
running up my post count some more .
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