Who's broken a CB?

[DirectConnection]

There's a little bit of confusion on another thread about CB's and which ones to look for.
http://www.turbododge.com/forums/sho...805#post648805

Some are saying a "C" casting has an advantage being cast in Mexico where the T-III blocks are said to be superior(less core shift and better material used). Some have said they cracked one of these "c" blocks, too. All of the blocks I have seen/heard of cracking in the back by the freeze plugs were '89 blocks. I am wondering if there's a certain year "c" block that we should look for ('90+)


So... anyone that has cracked a CB from making alot of power, please tell so we can get a collective result to see if there is truth to the later "c" blocks (90+) being better, or not. Also, note 2.2/2.5

Thanks!

[Turbo Charger]

I'm curious about that too.. Also what HP level did the 89 blocks crack at?

[looneytuner]

It should be TII blocks or just any C blocks since mopar used them up in any of the late model cars including na's. And add what type of transmission and equal or unequal driveshafts. I'm getting the suspicion that the problem is stress from the half shaft bracket on equal length axles.

[DirectConnection]

The halfshaft issue could be true.... but Gus ran an auto in his Slugmobile ('89 Acclaim) and cracked his block. I don't believe he used halfshafts on his car at all.

[DakotaKid]

Most all blocks have cracked because of cold weather and the wrong Coolant/Water ratio. That is why they crack aroung the freeze plugs. Too bad the freeze plug rarely do their job.

If anyone has broken a block for any reason, I would venture to guess they live in a cold climate and the block was once subjected to the harsh winter weather, or the half-shaft problem.

Now if the crank breaks 1st, that is a different story, then yes, the block would probably crack.

I should have my "C" block back from the shop this week, when I get it I will be sure to take plenty of photos of it.

[91DSX]

I have a smaller "C" stamp but just below the waterpump and there is another "C" on the back near the serial number? The casting date is 11-22-90. My motor is also just getting back from the machine shop, I will also take lots of pictures

[Reaper1]

I found a "C" block in a '89 TI 'Baron...to bad the guy wants to keep the car

[looneytuner]

U Wrench It St. Louis. 4 Daytonas right now. One has 2.5 C block. A Blue 92 has perfect gfx and 140mph speedo. I don't remember the other 2. The block is 135+ core u pull. all automatics. There's a couple sets of rear disks cars, who stole all the dohc 16 valve heads?

[supercrackerbox]

I found out today that the 2.5 that came in my 88 Z is one of the 'C' blocks. It also had LW rods with pressed pins, and the oil return tube didn't have the ridge towards the top like every other one I've ever seen, so I suspect that it may have been an NA motor converted for turbo. I didn't think to check the casting date, I'll do that before I take it to the scrap yard.

[Ondonti]

i find it hard to believe people are breaking blocks with pure power. Maybe cylinders are deforming in the highest power cars, but not blocks just cracking from power. 4 cyl bmW block was good for 15,000 rpm and 1000 hp just filling up some extra coolant passages to the head and running a slightly smaller bore. That was their stock street block that they were also using in their 86-87 turbo indy cars that actually were making 1400hp during qualifying laps when fuel was unlimited.


Now cold weather and equal half shaft.......I see a problem there.

[supercrackerbox]

Oh yeah, mine was cracked in the #2 cylinder through to the water jacket. Likely it froze at some point. Casting date was 8-9-88.

[Turbo Charger]

Quote:

Originally Posted by supercrackerbox I found out today that the 2.5 that came in my 88 Z is one of the 'C' blocks. It also had LW rods with pressed pins, and the oil return tube didn't have the ridge towards the top like every other one I've ever seen, so I suspect that it may have been an NA motor converted for turbo. I didn't think to check the casting date, I'll do that before I take it to the scrap yard.

I had a similar problem with my 89. The rebuilders (way before I got the car) put LW rods in the 89 2.5 block. NOT a good idea in a T2 car.

[MrBelvedere]

guys i got some news for ya the so called freeze plugs arent freeze plugs they are core plugs and also known as casting plugs the holes are there to let the sand out of the block after casting it not for letting frozen water expand