AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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What is the maximum bore size on the 340 replacement block (552) and the 340 siamese replacement block (478)?
I heard 4.080 on the non-siamese and 4.220 on the siamese? Are those correct figures?
Just trying to figure out which block to go with for a road race car. The big bore might be worth some power, even with the Edelbrock heads we'll be running.
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MattW
mopar addict
Reged: Jun 02 2005
Loc: Ontario Canada
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Quote:
What is the maximum bore size on the 340 replacement block (552) and the 340 siamese replacement block (478)?
I heard 4.080 on the non-siamese and 4.220 on the siamese? Are those correct figures?
Just trying to figure out which block to go with for a road race car. The big bore might be worth some power, even with the Edelbrock heads we'll be running.
From what I hear their casting have being very good and those figures are correct but you should always sonic check it. You MAY find a non-siamese with more meat on it.  Matt
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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Yep that pretty much sums it up....as always don't go for the max without a sonic test/common sense etc
So far so good, though. This morning I was told about two siamese blocks going together than had plenty of meat left at 4.20.
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sloan
Reged: Dec 28 2004
Loc: Rancho Cucamonga, Calif.
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My brother purchased a P5153478AB block which is the 340 siamesed bore block and I did the sonic test. The cylinder walls average thickness if bored to 4.25 was .180. Most of the thrust sides were in the .200-.210 range. I was impressed. We bored it to 4.155 so we have alot of life left in it. I sonic'd another one also and its numbers were VERY similar. I just wish that Mopar had a CNC lightening program as an option. THese little blocks are HEAVY....For a small block anyways.
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10.62 @ 125mph
Heads by INDIO MOTOR MACHINE; IMM.
Coming Soon....411" IMM ported 360-1 heads, roller cammed, big CP piston compression powerplant. Hopefully faster than before.
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HotRodDave
The Mileage Master
Reged: Jan 29 2005
Loc: Kalispell Montana
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Sloan think about how much just boreing it out to 4.250 would lighten it up. The cylinders are what about 7 inches long, that means you will remove about 35 or so cubic inches of cast iron just by boreing it on out there 
RyanJ at shadydellspeedshop offers a CNC lightening program to work on the outsides, lifter valley and even crank case I beleive.
Doing those two things should remove some serious weight. I think mopar don't offer it because so many guys want so many different things, screw in freez plugs, roller lifters, strength vs weight, motor mounts... just too many things for them to make variations of.
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"I may not have a brain, but I have a plan!" B.O.B.
68 cuda 318 best of 29 mpg so far...
91 Dodge Dakota 318 TBI EX cab 2x4 FOR SALE
00 5.9 Durango
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AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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Cool deal. There is a ton of rings available at 4.125 and 4.155. Not so much when you get over that but there are enough sizes available to pick your way around in the 4.200 range.
I like the 4.125 x 4.000 combo. 428 cubic inch SB Mopar sounds like a cool combo!
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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Yep, ring availability at 4 and 1/8 is great, I checked that out too....plus all the life one can get out of it/many rebuilds makes it a winner.
I know they're heavy, I have one myself and my back tells me it isn't far off from a stock 440 block.
Cnc lightening has been brought up, I even went as far as showing the MP brass LSM's Bow Tie block lightening pictures on their web page, but in the end it turns out to be a little too expensive (and complicated) for MP to offer at the moment.
The current thought is, for that to be an option it'd cost more than what Shady Dell charges.....maybe much more. In my humble opinion I don't think anyone would buy it at that price.
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Bob_Coomer
super gas
Reged: Nov 12 2003
Loc: Rock Springs
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Wow
Can these go safely to 4.25"? Thats 454 cubes with a 4" stroke....
I need to build me a serious small block some day.
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65 Hemi Belvedere coming soon
557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package
Whats faster..Cubic inch or Cubic dollar??
Edited by Bob_Coomer (Fri Aug 14 2009 10:43 PM)
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sloan
Reged: Dec 28 2004
Loc: Rancho Cucamonga, Calif.
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You need to sonic test before getting carried away however. I am fortunate that Bob Mazzolini Racing in Riverside allows me to use his sonic tester to check cylinder wall thickness. Both blocks that Bob recieved sonic tested very well. Bob was shocked at the thickness saying that they were by far the best R series blocks that he had ever tested. Both blocks he had would go 4.25. I know someone right now that is having a custom Sonny Bryant billet 4.5" stroke crank made for his small block. Do the math on that one! 
That same guy has already made a 4.375 stroke crank work and he said he could get a 4.5 to work as well. Now thats a BIG small block.
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10.62 @ 125mph
Heads by INDIO MOTOR MACHINE; IMM.
Coming Soon....411" IMM ported 360-1 heads, roller cammed, big CP piston compression powerplant. Hopefully faster than before.
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ScottSmith_Harms
Doc Bug
Reged: Jan 20 2003
Loc: Spokane Washington
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Dear Mopar,
Please make an aluminum small block that can be run in a street car with all of the features required to add all stock componants such as, heads, intakes, motor mounts, oil system, timing covers, etc.
Thank you,
Mr. Buyer
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sloan
Reged: Dec 28 2004
Loc: Rancho Cucamonga, Calif.
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 I second that motion!!!
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10.62 @ 125mph
Heads by INDIO MOTOR MACHINE; IMM.
Coming Soon....411" IMM ported 360-1 heads, roller cammed, big CP piston compression powerplant. Hopefully faster than before.
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AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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An aluminum SB block designed for the street would be very cool. My guess is that Indy is far more likely to make one than Mopar though. Indy already makes aluminum blocks and they build heads that could work with a new SB block.
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ScottSmith_Harms
Doc Bug
Reged: Jan 20 2003
Loc: Spokane Washington
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Well the first company that makes one as described above has an order waiting from me.
BTW, just so it's been said, I don't care to hear from all the "you can build a Hemi cheaper" neysayers either, we (Mopar faithful) need an aluminum small block Mopar as described above! Every other company has one but Mopar, it's a huge hole in our program that I can't believe has been ignored for so long (and sprint car blocks don't count).
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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It's been awhile and I'm thinking we're probably overdue for a status update.
Looks as if the ones marketed as 340 replacment are moving the quickest (understandable), and stock is being replenished equally quick. Nothing is on backorder.
P5007552AB-340 Replacement block 44 in stock
P4876381AB-9.025" 48* Siamese R3 dry sump 7 in stock
P4876671AD-9.2" 48* Siamese R3 dry sump 4 in stock
P4876791AD-9.2" 59* 9.2" Siamese R3 wet sump 3 in stock
P5153478AB-Siamese 340 replacement block 7 in stock
P4876673AD-9.6" 48* Siamese R3 9 in stock
P5153452-5.9 Magnum Siamese race block 3 in stock
P5153579-5.2 Magnum Siamese race block 6 in stock
P5007151AC-R4(P5 head) 0 stock, 0 backorders
P5007270AC-R4 (W9 head) 5 in stock
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AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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I have a 552 block on the way (340 replacement). Once it is here I'll post some pictures.
Does anyone make a main stud kit for these blocks? I talked to ARP and they didn't seem to be aware of these blocks. Manley, Milodon, Moroso, etc don't list stud kits. Must be someone out there?
Edited by AndyF (Sat Sep 26 2009 11:30 PM)
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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Yep, it seems rather odd isn't it?
I've never seen an off the shelf stud kit specifically for that block either.
Ryan J. and others worked it out a long time ago, but on ARPs side, it isn't much unlike the big block 3 cam bolt situation.....true, at least they offer the bolt kit but the kit doesn't work with a roller and never has, and the incorrect listing has gone on forever. There's a noticeable lack of interest there.
I mentioned to Jim (the book author/engineer) many users prefer studs, and asked why MP did not offer studs. He seemed kind of surprised since he worked pretty hard getting the bolt situation squared away, and from the overall reaction I got... I guess it isn't a product MP is interested in offering, same as ARP.
If you get a chance, check an old Crane catalog for SBM bronze intermediate shaft gears. The description of the part was wrong for the entire lifetime of the company....their part is big block only but they've always listed it being OK for sbm also. The gear is cut in the wrong direction for a small block  No workie.
I guess that's why folks refer to the sbm as the redheaded stepchild of the industry. The big stuff isn't too bad, but the little details are pretty crazy.
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mr_340
super gas
Reged: Jan 20 2003
Loc: DFW
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Maybe the wedge benefitted from the Hemi parts? Otherwise it might not have been any better than the small block.
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Floyd Lippencott IV
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RyanJ
moparts member
Reged: Jan 19 2003
Loc: State College, PA
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On the 4 bolt stud deal..... for the factory MP caps, just order an ARP 2 bolt main stud kit for SB/Hemi/BB & then order (6) 3.0" OAL 1/2" ARP studs with 1.25" of thread on each end, 6 fine thread 1/2" nuts & 6 .120" thick flat washers....
Hey Rich, I did find a screw up on a new block... (took me a while LOL) This is a new 673AD block (tall deck 48 Siamese) The #1 main cap has the locator tab for the bearing in the wrong location, it offsets the bearing to the rear of the cap, shoving it into the radius on the crank. Just FYI...
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www.shadydellspeedshop.com
SDSS is now an INDY Cyl Head, Manton Pushrod, Cometic, CP Piston, & Bullet Cams Warehouse Distributor
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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Ryan,
That's a big heads up/FYI. It did take quite awhile....
If you haven't already taken care of it and want some help, let me know.
If you see another one like that and don't have to get it out the door right away, definitely let me know!
I will need pictures (or the part itself sent back) to ping the machine shop for it.
Thx
Rich
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RyanJ
moparts member
Reged: Jan 19 2003
Loc: State College, PA
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I took care of it, but if someone was'nt paying attention when putting one together like that it would take bearing right out of it in minutes. I just found that on Monday & was like..... Hmm well there's another R3 problem I've never seen before LOL Just another thing to watch out for I guess.
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mr. 63plymouth
member
Reged: Jan 08 2009
Loc: Edmonton alberta Canada
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I bored mine 4 1/8" no problem, 461cube
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StrokerAspen
super stock
Reged: Nov 05 2007
Loc: Alberta Canada
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Haven't surfed this forums much lately, and have never seen this thread. Just checking in to bookmark it.
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"J" Casting headed N/A Small Block "Lean Burn 318"
Street Driven, Pump Gas Racin'
1.53 sixty foot
7.07 @ 96mph
11.18 @ 118mph
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AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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My 552 water block showed up today. Got a great deal from Mancini Racing on the block and shipping was less expensive than I was expecting.
The block has some interesting features which I wasn't expecting. Cam bearings are installed, it has ARP main bolts, it is finish bored to 4.040 and it has the soft plugs installed. Oh, it weighs 211 lbs! I weighed an old 318 block that I have in the shop and it only weighed 160 lbs.
Edited by AndyF (Tue Oct 27 2009 04:07 PM)
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AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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Picture of the bottom side.
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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StrokerAspen
super stock
Reged: Nov 05 2007
Loc: Alberta Canada
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Lookin good!!!
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"J" Casting headed N/A Small Block "Lean Burn 318"
Street Driven, Pump Gas Racin'
1.53 sixty foot
7.07 @ 96mph
11.18 @ 118mph
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AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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I sonic checked my block and it measures about .300 on the thrusts but only about .125 on the sides. That is at a 4.040 bore so I don't think this block should go more than 4.080 max. We're planning to bore it to 4.060. With a 4.125 stroke crank it will be 427 inches.
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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Sounds like a normal water R3 casting, just tell the eventual owner to avoid running straight water for coolant, and try like heck to never let it rust on the inside.
The siamese blocks are usually more consistent but the weight penalty is a little greater, so what you have there is a pretty decent comprimise.
If you get a minute, test the deck thickness too. Alot of the weight comes from the decks because of the 9.00 height capability, and a test should confirm that.
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AndyF
moparts guru
Reged: Jan 20 2003
Loc: Oregon
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I sent the main stud specs to ARP. They have everything required to make a stud kit in their catalog, just need to assign a part number to the new kit. They are sending me a prototype kit to check out on this block. If it all works out correctly then maybe we'll get a part number setup.
They have a special main bolt to fit under the oil pump. Guess that is a common problem.
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StrokerAspen
super stock
Reged: Nov 05 2007
Loc: Alberta Canada
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I went down to the local Dodge dealer and ordered up a block. 9.6 deck 48* Siamese bore deal.
P4876673AD
I haven't had time to sonic check it yet. BUT I might get some time tomorrow.
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"J" Casting headed N/A Small Block "Lean Burn 318"
Street Driven, Pump Gas Racin'
1.53 sixty foot
7.07 @ 96mph
11.18 @ 118mph
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HotRodDave
The Mileage Master
Reged: Jan 29 2005
Loc: Kalispell Montana
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you going to put the 318 guts in it?
--------------------
"I may not have a brain, but I have a plan!" B.O.B.
68 cuda 318 best of 29 mpg so far...
91 Dodge Dakota 318 TBI EX cab 2x4 FOR SALE
00 5.9 Durango
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StrokerAspen
super stock
Reged: Nov 05 2007
Loc: Alberta Canada
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No, this one will be built over the next year. I will be running my "Lean Burn 318" for this next year. The only thing that is 318 about my current set up is the block. It's a little bigger on the inside.
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"J" Casting headed N/A Small Block "Lean Burn 318"
Street Driven, Pump Gas Racin'
1.53 sixty foot
7.07 @ 96mph
11.18 @ 118mph
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SV_MOPARS
enthusiast
Reged: Sep 02 2003
Loc: simi valley,calif.
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Quote:
"I'll be your huckleberry"
You can PM me here or any other MP vendors for current pricing or availability.
troy, not to get off subject, but that is one of my all time favorite quotes from a movie ever!!
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ZIPPY
Get-Real! Get-X!
Reged: Jan 20 2003
Loc: S.E. Michigan
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Re: P5007151AC, R4, P5 head....
checked for someone today, and there are finally 7 of them in stock.
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