Need info. Has this ever happend or have you heard of this happening.

Alright was working on installing my new cam in my ls1. The block has brand new bearings in it. We mic'd them and they cam out to BEST we can tell with this mic to be the correct size. BUT while we tried to install my camshaft . (Tick Performance Polluter Cam (24x/24x (.61x"/.61x") 112LSA) The cam bearing journal on the rear of the cam was too large to fit inside of the block. Is it possible the cam was ground wrong? It will FIT if I was to FORCE it in but it wont slide in. So the cam is big but only by a small small ammount. Going to take the stock cam over and see if it will fit in. If it will that narrows it down to HAVING to be the cam correct?

ive never experienced anything like that...

what do u mean

Quote:

---

The cam bearing journal on the rear of the cam was too large to fit inside of the block

---

Ok I have the front of the cam in my hands. Sliding the cam into the block rear of the cam first. Trying to insert through the first bearing and the cam wont go through. It hangs up. Like either the cam is too large or the bearing too small. The bearing checked out. Im going to try to put my stock cam in to make sure we arent wrong about it being the cam

We were wrong. Apparently the cam bearings are WRONG. Stock cam wont even fit in there. Sending block off monday to get it fixed. Does anyone have a part number from a few brands to make this jack holes get it right this time around

Quote:

---

Originally Posted by Show&Go

We were wrong. Apparently the cam bearings are WRONG. Stock cam wont even fit in there. Sending block off monday to get it fixed. Does anyone have a part number from a few brands to make this jack holes get it right this time around

---

Let's hope the same guys build your block either. If that's wrong, I wonder what else is?

uhh i have had cam bearing problems in the past...sucks....what year is the block?

Im putting together the block myself. I have checked every part. I figured SURELY no need to check the cam bearing thats idiot proof.... I was wrong there. Every bearing they sent was correct till then. And 99 block

Quote:

---

Originally Posted by Show&Go

Im putting together the block myself. I have checked every part. I figured SURELY no need to check the cam bearing thats idiot proof.... I was wrong there. Every bearing they sent was correct till then. And 99 block

---

AH gotcha that's right. Well at least you don't have to worry about anything else besides that

Ill make sure the new ones are right before they ever go in the block. Imma bring my cam with me up there and prefit them. Shouldnt take long to get sorted out. Was just really wantin to have that stupid truck going by SAR but looks like there isnt a chance of it now.

dude you have been having the worse of luck, hope you get it all sorted out!!!

Thanks skeet. And it will work itself out sooner or later. the rotating assembly is in at least.

Who is putting the bearings in?

The Rod and Main I did myself. Which they all checked out to be exactly what they should be. The Cam bearings a local machine shop. The bearings arent in wrong or nothing they are just wrong. Which is weird because the oil passages all lined up perfectly.

THere are two different LS cam bearings, he must have put in the ones for the newer engine rather than the older ones or buggered up the rear bearing.

Quote:

---

Originally Posted by RedHeartbeat

THere are two different LS cam bearings, he must have put in the ones for the newer engine rather than the older ones or buggered up the rear bearing.

---

Red you mind being specific on these two different bearings. And it was actually the front bearing that was for sure messed up. The rear of the cam wouldnt even begin to go in. And I also have a question relating to what you said. if there are two different cam bearings why isnt there a specification on ordering a camshaft?

There is one bearing size up through 2004 and another size, like a C23 for the later blocks. Here is one for the early blocks. I'm not sure on the dimensions of the bores but they are different. If you drive the larger bearing into the older block the bearing bore will be too tight.

97-2004 http://www.summitracing.com/parts/FE...n/?prefilter=1
2005 and newer http://www.summitracing.com/parts/DUR-CHP-23T/

Quote:

---

Originally Posted by RedHeartbeat

There is one bearing size up through 2004 and another size, like a C23 for the later blocks. Here is one for the early blocks. I'm not sure on the dimensions of the bores but they are different. If you drive the larger bearing into the older block the bearing bore will be too tight.

97-2004 http://www.summitracing.com/parts/FE...n/?prefilter=1
2005 and newer http://www.summitracing.com/parts/DUR-CHP-23T/

---

So the block is what is different between the years and if you keep the right bearing in there the cam will still fit?

Yea but also there are different size bores for the bearings but most come with the instructions for where to install the bearings

welp they fudged it up. So we gonna figure out how to undo that issue

Yeah, they bore the block so that a thicker cam bearing can be used. The cam journal size is the same for all the years, it's just that the block is bored larger. Due to the soft malleable nature of the bearings it is physically possible to put the newer bearing inside an older engine. Do you have the PN of the bearing they installed? Did they buy and install the bearings or did you get them? Durabonds are one of the best you can get, they are coated and made in one piece rather than made flat originally and then rolled into a circle.

Quote:

---

Originally Posted by danger_ranger83

Yea but also there are different size bores for the bearings but most come with the instructions for where to install the bearings

---

Yep, at least in the old days the bearings are smaller the farther rearward...so if the installer put the rear bearing in the front the cam won't go in.

If i remember correctly the middle is the largest and then 2&4 are a bit smaller then 1&5 are the smallest

Well with it off the engine stand and at the machine shope we got to play around a bit... If we try to insert the cam from the rear of the engine it works all the way through UNTIL it gets to the front cam bearing and it wont finish going through. The machineist feels he put the wrong bearing in cocked to a angle or something. So he is going to order a new front and all and handle it and get it back to me asap

lets just hope it is just the wrong set of bearings. old whitey needs to be at SAR

Quote:

---

Originally Posted by sierraman

lets just hope it is just the wrong set of bearings. old whitey needs to be at SAR

---

+1

I dont have enuf off days till right before SAR to get her running. So there isnt a chance it will make it to SAR cause I wont have time to secure a trailer and I doubt the tune will be lined out in just a few days. I hope to have her cranked and cruising just not ready for a 10 hour trip. This last Saturday was the hail mary day that if everything went right I may of made it. But... looks like thats all down the drain now. Another year of spectation :(

Don't sleep. Wrench.

Quote:

---

Originally Posted by Frenchy

Don't sleep. Wrench.

---

exactly, you just said it a 10 hour trip, let a friend drive while you sit in the truck on a uhaul trailer and tune it. that way you have nothing to distract you.:LOL:

Quote:

---

Originally Posted by sierraman

exactly, you just said it a 10 hour trip, let a friend drive while you sit in the truck on a uhaul trailer and tune it. that way you have nothing to distract you.:LOL:

---

You and Frenchy are insane lol. Ill keep working towards it. Just no promises

Alright. So the machinist had the bearing in wrong. He got it fixed and back to me today. I got the camshaft put in but sadly I am sick as a dog so that is all I did today. Hopefully tomar Ill get the oil pump timing gears and all put on and then put the heads on this weekend on so on and so forth. Also for further reference. According to this builder the bearings ARE different. 1 and 5 are same, 2 and 4 are the same and 3 is different. That was the instructions he got for these bearings anyway.

Quote:

---

Originally Posted by danger_ranger83

If i remember correctly the middle is the largest and then 2&4 are a bit smaller then 1&5 are the smallest

---

I'm not trying to ding on you here, but wanted you to think about what you are trying to say ... if the 1 & 5 were smaller, you wouldn't be able to get #2, #3, or #4 past #1. If they are different sizes, it would have to be #1 being the largest and going smaller from there back, with #5 being the smallest. I hope this makes sense.

Outside diameter....

lawlz

Either way aside from oil pump the bottom end is assembled.... Heads will hopefully be on tomar as well as the valley cover knock sensors etc.