Re: RB rods in short deck ???
[Re: RockChip]
#1383370
02/08/13 12:48 AM
02/08/13 12:48 AM
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Joined: Oct 2003
Posts: 1,409 Ont. Canada
10.90 Racer
super street
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super street
Joined: Oct 2003
Posts: 1,409
Ont. Canada
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Quote:
Does anyone make a piston for stock stroke 400 with a 6.760 rod?
Why would you want a long rod????
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Re: RB rods in short deck ???
[Re: Winchester 73]
#1383372
02/08/13 10:21 AM
02/08/13 10:21 AM
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Joined: Jan 2003
Posts: 9,888 Weddington, N.C.
Streetwize
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master
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Weddington, N.C.
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PM member MoPork, he has a long rod 383 combo that revs really nice. Not sure who made his slugs but Ray Barton did his short block.
That said, from my experience Diamond will pretty much make you anything you want for a pretty reasonable fee.
Last edited by Streetwize; 02/08/13 10:22 AM.
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Re: RB rods in short deck ???
[Re: RockChip]
#1383373
02/08/13 10:55 AM
02/08/13 10:55 AM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
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master
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NOTES FROM A VERY SHARP MEMBER http://victorylibrary.com/mopar/rod-tech-c.htm Quote:
Planning a 383 Motor This engine is generally overlooked in selecting a high-performance project. The motor has an excellent bore to stroke ratio: 1.26-1 (similar to 327 SBC, better than 340). The short stroke allows high RPM without destructive piston speed (7100 RPM = 4000 ft./min., the accepted safe limit for piston stress). The large bore permits big valves (2.14 intake, 1.81 exhaust). A potential method of increasing peak power is to substitute the longer 440 6.768 (LY) rods for the original B 6.358 rods on the original crank. This has the following effects: » Increases the rod ratio (n) from 1.884-1 to 2.005-1 » Reduces the piston compression distance to about 1.525 for a useful weight savings » Slightly reduces piston acceleration This should allow an advantage in peak power. For a start in piston selection, take a look at the KB224 for BBC: flat top, CD = 1.52 (just below zero deck), and .990 pin for more weight savings and moderate cost. There may also be possibles for the 400 (4.34 bore), but not discovered yet. Ideas?
home of the Sox and Martin Hemi Duster
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Re: RB rods in short deck ???
[Re: RockChip]
#1383374
02/08/13 11:02 AM
02/08/13 11:02 AM
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Joined: Jan 2003
Posts: 10,015 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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What do you have in mind? There are some good choices if you are willing to offset grind a stock crank and use chevy rods. You can get 426 cubes very cheaply out of a 400 with a stroked 383 crank.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: RB rods in short deck ???
[Re: gregsdart]
#1383375
02/08/13 02:01 PM
02/08/13 02:01 PM
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Joined: Sep 2003
Posts: 2,008 Sweet Home Alabama
MRMOPAR622
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top fuel
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You can use a 4.15 crank,6.57 rods with a 1.30 cr-height pistons that combo works real well in a low deck.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: RB rods in short deck ???
[Re: MRMOPAR622]
#1383377
02/08/13 02:38 PM
02/08/13 02:38 PM
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Joined: Jan 2003
Posts: 75,083 U.S.S.A.
JohnRR
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Quote:
You can use a 4.15 crank,6.57 rods with a 1.30 cr-height pistons that combo works real well in a low deck.
The 1.320 Ch piston that is available will work with 3.75 , 3.9 and 4.25 strokes with just a rod change. ' I'll actually ANSWER the OP question There isn't a shelf stock piston but as mentioned above any of the manufactures will make you one , EXCEPT KB ... You need a piston about 1.520
Diamond actually lists one for a 383 but not a 400 ??? odd ...
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Re: RB rods in short deck ???
[Re: 10.90 Racer]
#1383379
02/08/13 07:06 PM
02/08/13 07:06 PM
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Joined: Jan 2003
Posts: 17,923 Akron, Ohio
ProSport
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Quote:
Quote:
Does anyone make a piston for stock stroke 400 with a 6.760 rod?
Why would you want a long rod????
Why not?
Best engine I've ever owned was my low deck 451, zero deck flat tops, 440 crank 6.76 440 rods, Eddy heads, 590 purple shaft in at 104. Ran 9.90's at 3050 pounds through the mufflers. Very streetable too.
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Re: RB rods in short deck ???
[Re: Dean_Kuzluzski]
#1383381
02/08/13 09:11 PM
02/08/13 09:11 PM
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Joined: Jan 2003
Posts: 10,015 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Rockchip, where are ya? Anyway, Ross makes a 4.375 bore (400 block) piston in 1.421 compression height to fit .990 pins. There are lots of low priced H beam rods made with 2.200 rod bearings, and 6.8 long. Put the whole deal together with the 383 crank ground to about 3.52 stroke, and you have about the cheapest good stroker combo IMHO. Total compression height works out to 9.981, or close to perfect. It gives you an off the shelf rod, piston, and the only extra machine work is offset grinding the rod journals. For those that get their pantys in a bunch over rod ratios (not pointed at any one in particular!) the rod ratio comes out at 1.932, almost ideal. Another good thing about this combo- price the difference between the 2.200 race rod bearings and the mopar 2.375 bearings. I paid $180 for my last set of race bearings (-.001) for my Mopar sized crank.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: RB rods in short deck ???
[Re: gregsdart]
#1383383
02/08/13 09:55 PM
02/08/13 09:55 PM
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Joined: Jan 2003
Posts: 75,083 U.S.S.A.
JohnRR
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Quote:
Rockchip, where are ya? Anyway, Ross makes a 4.375 bore (400 block) piston in 1.421 compression height to fit .990 pins. There are lots of low priced H beam rods made with 2.200 rod bearings, and 6.8 long. Put the whole deal together with the 383 crank ground to about 3.52 stroke, and you have about the cheapest good stroker combo IMHO. Total compression height works out to 9.981, or close to perfect. It gives you an off the shelf rod, piston, and the only extra machine work is offset grinding the rod journals. For those that get their pantys in a bunch over rod ratios (not pointed at any one in particular!) the rod ratio comes out at 1.932, almost ideal. Another good thing about this combo- price the difference between the 2.200 race rod bearings and the mopar 2.375 bearings. I paid $180 for my last set of race bearings (-.001) for my Mopar sized crank.
If there is that CH piston he could use the Hemi spec 6.860 rod on the 383 crank and save the cost of grinding the crank.
Last edited by JohnRR; 02/10/13 01:50 PM.
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Re: RB rods in short deck ???
[Re: JohnRR]
#1383384
02/09/13 12:35 AM
02/09/13 12:35 AM
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Joined: Jan 2003
Posts: 10,015 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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Quote:
Quote:
Rockchip, where are ya? Anyway, Ross makes a 4.375 bore (400 block) piston in 1.421 compression height to fit .990 pins. There are lots of low priced H beam rods made with 2.200 rod bearings, and 6.8 long. Put the whole deal together with the 383 crank ground to about 3.52 stroke, and you have about the cheapest good stroker combo IMHO. Total compression height works out to 9.981, or close to perfect. It gives you an off the shelf rod, piston, and the only extra machine work is offset grinding the rod journals. For those that get their pantys in a bunch over rod ratios (not pointed at any one in particular!) the rod ratio comes out at 1.932, almost ideal. Another good thing about this combo- price the difference between the 2.200 race rod bearings and the mopar 2.375 bearings. I paid $180 for my last set of race bearings (-.001) for my Mopar sized crank.
If there is that CH piston he could use the Hemi spec 6.860 rod on the 383 crank and saze the cost of grinding the crank
True, but the down side is a VERY heavy rod,more bob weight, and the crank may need work anyway. Plus you lose the cubes, and the 424 to 426 cube deal should be a real winner with small port heads.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: RB rods in short deck ???
[Re: Dean_Kuzluzski]
#1383385
02/09/13 01:10 PM
02/09/13 01:10 PM
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Joined: Jan 2003
Posts: 31,063 Oregon
AndyF
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Oregon
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Quote:
Quote:
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Quote:
Does anyone make a piston for stock stroke 400 with a 6.760 rod?
Why would you want a long rod????
Why not?
Best engine I've ever owned was my low deck 451, zero deck flat tops, 440 crank 6.76 440 rods, Eddy heads, 590 purple shaft in at 104. Ran 9.90's at 3050 pounds through the mufflers. Very streetable too.
While you're 451 was quite outstanding............
I think the point others are trying to make is that the 383/400 already has a better rod-to-stroke ratio and anything more is beyond a point of valid results/return. Meaning, not worth the cost of custom pistons & rods for the marginal gain.
There's no cubes gained like the long rod 400/451 combo, just less piston/rod angularity and a longer dwell time at TDC. All of which is debatable to many on this board.
Good topic though, I'd like to see a build to see a roller cam'd 383 hammer'd out on a dyno.
I spent a fair amount of time on the dyno with that little 400 engine. Stock 383 forged crank, Hemi rods, and as much compression as we could get with the short stroke. It made pretty good power for a small engine and moved the car down the track really well. I thought it was a great combo.
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Re: RB rods in short deck ???
[Re: AndyF]
#1383386
02/10/13 01:52 PM
02/10/13 01:52 PM
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Joined: Jan 2003
Posts: 75,083 U.S.S.A.
JohnRR
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Quote:
Quote:
Quote:
Quote:
Quote:
Does anyone make a piston for stock stroke 400 with a 6.760 rod?
Why would you want a long rod????
Why not?
Best engine I've ever owned was my low deck 451, zero deck flat tops, 440 crank 6.76 440 rods, Eddy heads, 590 purple shaft in at 104. Ran 9.90's at 3050 pounds through the mufflers. Very streetable too.
While you're 451 was quite outstanding............
I think the point others are trying to make is that the 383/400 already has a better rod-to-stroke ratio and anything more is beyond a point of valid results/return. Meaning, not worth the cost of custom pistons & rods for the marginal gain.
There's no cubes gained like the long rod 400/451 combo, just less piston/rod angularity and a longer dwell time at TDC. All of which is debatable to many on this board.
Good topic though, I'd like to see a build to see a roller cam'd 383 hammer'd out on a dyno.
I spent a fair amount of time on the dyno with that little 400 engine. Stock 383 forged crank, Hemi rods, and as much compression as we could get with the short stroke. It made pretty good power for a small engine and moved the car down the track really well. I thought it was a great combo.
Andy that was a good build , the bad thing is that rod is no longer in existence , it was the Manley sportsmaster 6.965 rod if I remember right , after you did that build I was going to do my 383 that way , rods couldn't be found .
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