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SB race block and heads ID? #3076596
09/12/22 12:59 PM
09/12/22 12:59 PM
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Oregon
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AndyF Offline OP
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I think these are W5 heads and the block is a race block but not sure if it is an R block or a later version? The casting numbers are different than the Mopar numbers so it gets confusing.

IMG_0964 (Large).JPGIMG_0965 (Large).JPG
Re: SB race block and heads ID? [Re: AndyF] #3076610
09/12/22 01:24 PM
09/12/22 01:24 PM
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Portsmouth, VA
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DusterW2 Offline
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Block is a mopar X block. Should have an X cast on the passenger
side front of block below the deck surface. Block precedes
the R block series. It has filled in pan rails, thicker deck
and bore thickness.

Re: SB race block and heads ID? [Re: DusterW2] #3076641
09/12/22 03:05 PM
09/12/22 03:05 PM
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Oregon
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AndyF Offline OP
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Okay, I'll look for the X. I was told by the owner that it was an R block but the part number didn't match up. The owner said it was an R block with W9 heads but I'm thinking now that it is an X block with W5 heads.

Re: SB race block and heads ID? [Re: AndyF] #3076646
09/12/22 03:42 PM
09/12/22 03:42 PM
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Ambridge, Pa.
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rickraw Online content
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I believe r blocks have an r on the pass side front near the deck. Those aren’t w9’s.

Re: SB race block and heads ID? [Re: rickraw] #3076651
09/12/22 03:57 PM
09/12/22 03:57 PM
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W. Pa
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usp4u Online content
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X or R blocks will have a designator cast into the RT front.
X
R
R1
R1A
R2
R3
R4
R5

The casting #s are virtually useless given the amounts of variations that were available. A couple of my R blocks have actual "P" part numbers die stamped on them, but I dont recall where at.

There are a few variants of W5s....post some more pics of the heads. Particularly the rocker lay-out and the ends of the heads.


The world of R blocks is a total rabbit hole. Chrysler screwed up more than a few. Ive seen them with undrilled oil galleys. I currently have 5 of them, including one of the ones that got sold with the wrong cam tunnel down

Last edited by usp4u; 09/13/22 07:27 AM.
Re: SB race block and heads ID? [Re: usp4u] #3076662
09/12/22 04:42 PM
09/12/22 04:42 PM
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Tulsa OK
Bad340fish Offline
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Ryan Johnson's web page used to have a lot of good info about the different blocks. I have an R1 59* and it is an oddball because it takes the 340 oil pan where most take the 360.

There is a web archive of his FAQ page that has some info.

https://web.archive.org/web/20050206201421/http://shadydellspeedshop.com/faq.htm


68 Barracuda Formula S 340
87 "Chrysler" Conquest
Re: SB race block and heads ID? [Re: AndyF] #3076685
09/12/22 06:04 PM
09/12/22 06:04 PM
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Kalispell Mt.
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HotRodDave Offline
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That's the same casting number as a run of the mill 318 block... should be able to see a big X on the front.


I bought a 318 one time because I assumed it was the x block when he told me it had 4.070 bore pistons in it and a rod knock, I told him if it did have 4.070 pistons in it I would buy it and sure enough it was 4.070 but it was not an X block, the bare block weighed only 122 LBS, it had 12.5 forged pistons, forged crank and huge cam but the cylinders were fine.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: SB race block and heads ID? [Re: AndyF] #3076754
09/12/22 09:07 PM
09/12/22 09:07 PM
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Portage,michigan
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Originally Posted by AndyF
Okay, I'll look for the X. I was told by the owner that it was an R block but the part number didn't match up. The owner said it was an R block with W9 heads but I'm thinking now that it is an X block with W5 heads.


No guessing about the heads, they say W5 right on them.
Block will have a huge X on the left front side( if looking at it from the front of the car) if it’s an X block. Otherwise it’s just a 318.
The X and 318 do both come with same bore size, 3.91


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Best so far, 10.68 at 124.48
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Re: SB race block and heads ID? [Re: B3422W5] #3076899
09/13/22 11:16 AM
09/13/22 11:16 AM
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central texas
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krautrock Offline
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quick google image search...is this what an X block looks like?

https://www.forabodiesonly.com/mopar/threads/318-340-race-x-block.460755/

Re: SB race block and heads ID? [Re: krautrock] #3076909
09/13/22 11:43 AM
09/13/22 11:43 AM
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Kalispell Mt.
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HotRodDave Offline
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Originally Posted by krautrock
quick google image search...is this what an X block looks like?

https://www.forabodiesonly.com/mopar/threads/318-340-race-x-block.460755/


Yes


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: SB race block and heads ID? [Re: AndyF] #3078864
09/19/22 08:21 PM
09/19/22 08:21 PM
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Oregon
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AndyF Offline OP
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It is an X block. I looked at it again today and the X is obvious now that I know what to look for. Owner said it was an R block but obviously he didn't notice the big X on the front.

IMG_0993 (Large).JPG
Re: SB race block and heads ID? [Re: AndyF] #3078872
09/19/22 08:39 PM
09/19/22 08:39 PM
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Posts: 11,395
W. Kentucky
justinp61 Offline
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X block with W5 heads.

Re: SB race block and heads ID? [Re: justinp61] #3078891
09/19/22 09:22 PM
09/19/22 09:22 PM
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Hope he didn’t pay R block W9 price for that! laugh2







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