Thanks for the info strokeme!
There is a cracking problem that is becoming an epidemic, and its only among the 351 roller blocks, the F4TE. We are averaging 2-3 cracked blocks for every 10 we get in. The crack is in the same spot every single time.
The cracks are noticed easily by eye when you remove the number 2 and number 4 cam bearing. Its not a coincidence that this is the same area that is used for the spider tray hold down. You can clearly see the cracks in the picture.
A problem will arise if this crack runs, the cam bearing will lose press and the bearing will walk out quickly and its all down hill from there.
I can guarantee alot of shops will use the block, whether they overlook it or think its not a big deal. I do NOT use these blocks. If you are having your roller windsor block machined, tell your machinist you want to see this area, protect yourself.
I will answer all questions should you have any
Hadn't hours to read through the entire thread, so, has the roller-cam steel gear/distributor driven gear issue been discussed? Big let-down to have a distributor gear get "eaten".Its up to you, pull the number 2 AND 4 cam bearings and look for these cracks
Bore size has nothing to do with it. RPM and/or cylinder pressures are what kill factory 302 blocks. And yes, it's blatantly obvious that the 302 is being pushed higher than it should when they break. That's usually why engines break: they were pushed harder than they were designed to go.People talk about 302s coming apart and most of those cases can be attributed to boring the block out further than they should, the 302 is also a much weaker block than the 351 from the factory and is being pushed higher than it should be IMHO.
mmmmmmmmm no he actually said 2-3 blocks for every ten.Strokeme said 1/10 blocks have this crack.
The whats and whys of the cracks forming is irrelevant. They're there, and it's not recommended that they be used.We are averaging 2-3 cracked blocks for every 10 we get in.
I'm just going mild compared to some of the numbers I've seen here.... planning on 400-450 hp. Even though it's not going to be a strip only car (it's mostly a garage queen), I don't know if I can sleep at night if those are there, LOL. Hopefully I'm lucky.Anyone can use the block if its cracked. I just made a note of it, since I saw so many of them. Life is all about choices