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Author Topic: Getting the RB 383 back  (Read 4149 times)

firedome

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Getting the RB 383 back
« Reply #15 on: March 24, 2010, 05:04:59 PM »

You can get pistons from Egge.

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Getting the RB 383 back
« Reply #16 on: March 28, 2010, 07:30:40 PM »

Quote from: Snotty
According to my '63 Chilton's book, the '59-'60 383 had a bore of 4 1/32 and a stroke of 3 3/4 (3.75 as Firedome said).  From what I cna see no other motor had that bore.
 
350: 4 1/16
361: 4 1/8
383 B: 4 1/4
413: 4 3/16
 
I know the 400, 426, and 440 had larger pistons - 400 being the largest of course!  So, given these measurements, you are going to need to get 383 RB specific pistons or bore the motor to take larger ones.
 

340 pistons have a deck height of 1.85inch and a bore of 4.040 stock, deck height for a 383 RB block is 2.08ish, so here is the major question with the RB. What is the deck to piston top at top dead center to determine how close this would be for starters and go from there.
 
http://www.csgnetwork.com/compcalc.html
 
Now calculate it out. 4.050 pistons (340 .010 overbore) flat top, no dimples, deck height of the piston is 1.85 vice 2.08 as stated (for zero deck height), CC of the heads is the 65-67cc variant closed chamber EXCELLENT head (even with 4 bolt vavle covers), stroke of 3.750, and a .040 head gasket thickness. Get floating piston pins and have the rods bushed to handle the 340 pistons and you have a 9:1 engine no problem (I thought it was going to be something closer to 8.5:1).
 
It ain't hard, just gotta get the pistons and bush the stock rods to have the floating piston pins (for better performance). 2.08 intakes and 1.65 exhaust are stock in the closed chamber heads, and if you want to talk to me with a pm, I will port the heads reasonably priced (I'm retired, I don't need the money, but love the thanks), so punch the numbers into the calculator link and check it out.
 
dana442010-03-29 00:42:18
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Snotty

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Getting the RB 383 back
« Reply #17 on: March 29, 2010, 02:56:39 PM »

Quote from: dana44
340 pistons have a deck height of 1.85inch and a bore of 4.040 stock,
 
I didn't look at small block sizes; did not even occur to me. 
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firedome

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Getting the RB 383 back
« Reply #18 on: March 29, 2010, 03:17:11 PM »


If not staying with original, you'd be better off with a 340!
firedome2010-03-29 20:18:10
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Getting the RB 383 back
« Reply #19 on: March 29, 2010, 08:59:07 PM »

It is very doable, only minor surgery that isn't seen from the outside and would never be known, just bush the rods to fit the pins, simple surgery and flat top highest deck you can get on the piston and you are good to go. If the engine is apart or the heads are off, measure your deck to top of piston distance, the rest of the calculations work out just fine otherwise.
Ed
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Stan Paralikis

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Getting the RB 383 back
« Reply #20 on: March 30, 2010, 03:55:17 AM »

It just came to me that I once read that Diamond had pistons for the 383 RB.
http://www.diamondracing.net/

Steve

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Getting the RB 383 back
« Reply #21 on: March 30, 2010, 05:40:31 AM »

It was the prerunner to the 413, introduced in 1961 I believe.  Only in a 4 barrell, except in trucks
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Getting the RB 383 back
« Reply #22 on: March 30, 2010, 02:34:41 PM »

Quote from: POLARACO
It was the prerunner to the 413, introduced in 1961 I believe.  Only in a 4 barrell, except in trucks

361 is a B block, 413 is an RB block, keep up with the conversations Steve.
 
Yeah, a custom set of pistons can be made by several companies out there, just have to find them and deal with the cost involved, some are more expensive than others.
 
Still waiting to compare the piston top to deck top distance just to verify the 340 pistons .010 overbore (according to the 4.050 bore right now) to make a final determination of the distance down in the bore the 340 piston would be, see if it would be acceptable for compression (even though it looks good in the computer model I attached). I know some of the 318 engines had pistons that could be .080-.120 down in the holes without a problem, just want to verify this. Only other thing, as stated is the rod bushings for smaller wristpins.
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Steve

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Getting the RB 383 back
« Reply #23 on: March 30, 2010, 02:58:29 PM »

I was refering to the 383 RB, not the 361.  Yep!  I do know the diff.
 
B Block
350, 361, 383 (After 1960) , 400
 
RB
383 (2 Years) 413, 440 
I don't recall any other sizes in the RB's.
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Getting the RB 383 back
« Reply #24 on: March 30, 2010, 03:02:58 PM »

Quote from: POLARACO
I was refering to the 383 RB, not the 361.  Yep!  I do know the diff.
 
B Block
350, 361, 383 (After 1960) , 400
 
RB
383 (2 Years) 413, 440 
RB 426 Wedge/Max Wedge.

I think it is a viable swap, it is actually the tallest piston pin to deckheight piston I could find in the simple piston search. Wish there was something off the shelf with a little higher deck height, but hey, gotta work with what you have sometimes.dana442010-03-30 20:04:47
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Rob Molloy

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Getting the RB 383 back
« Reply #25 on: April 01, 2010, 06:27:37 PM »

Well, I got the pistons from egge. I hope there are no issues with them. They will be in tomorrow, and reassembly possibly starts on Sunday. I can't wait to get this thing running again!!!

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Getting the RB 383 back
« Reply #26 on: April 12, 2010, 08:34:09 PM »

Quote from: rob_molloy
Well, I got the pistons from egge. I hope there are no issues with them. They will be in tomorrow, and reassembly possibly starts on Sunday. I can't wait to get this thing running again!!!

Have you gotten a piston in so you can measure your piston top to deck height clearance to see what the new compression is going to be?
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Rob Molloy

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Getting the RB 383 back
« Reply #27 on: November 03, 2010, 01:52:11 PM »

Wow. I hadn't realized how long it's been since I've been on here. The engine it fully together, and actually in the car. Stupid me (or guy at shop for forgetting) but we forgot to put the oil pump shaft in, so I get to have fun doing that this weekend. Along with bolting on the generator, water pump, PS pump, and Monday I should get the carb adapter plate, and can finally button this up and maybe get it started. Here's a pic of the way it's sitting right now:
 
 
 
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Getting the RB 383 back
« Reply #28 on: November 03, 2010, 07:25:06 PM »

Pretttyyyyyyyyy.
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Steve

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Getting the RB 383 back
« Reply #29 on: November 03, 2010, 08:46:46 PM »

Nice Job
 
You've been around to have your seeds broken, so I'll ask this question.
 
 
But does it run!?!  
 
I do that to everyone
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