I've seen quite a few with much more than 600-700. I've never heard of anyone breaking one either. Doesn't mean it can't happen, just not common.
Wait, I broke one. But it was 60 over and a cylinder wall split. It didn't split the block or break a main cap or anything like that. It happened on the way back from the muffler shop after installing cutoffs, which were uncorked. My buddy was with me and we were driving under this concrete bridge and I floored it and POP.
La Habra, CA
1964 Falcon Club Wagon - Bone Stock
408w AFR205\'s XR286R Super Victor AED 950 602hp at 6400
C4 reverse manual with brake. 325/50R15 MT 4.11\'s 9\"
I asked a machine shop machinist that quest once. He had a bunch of Ford, Mopar and Chevy big blocks in his shop at the same time and compared the caps of all three together. Checy was so small it was funny. Mopar was pretty beefy, but the 460's, he said unless you're putting a blower or running Daytona this weekend, you'll break something else before this Ford block breaks. Most braeks are due to something else and not any weakness in the BBF block.
the stock rods are the problem, even the football rods with arp rod bolts, the rod typically breaks at the beam, I would definately suggest a scat h-beam for hp apps. I have seen numerous stock cranks on a well balanced motor take 8k+ rpm in pull trucks
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Stock Rods are considered good untill the 550-600 hp range. I have heard arguments the either design (football of Broach)is equal, when they fail it is in mid-lower beam not at the base where the beam meets the large end.
As for the blocks with stock 2 bolt caps the are good to the 800 hp range and installing 4 bolt caps I have heard of guys pushing the to well over 1000hp.
Stock cranks are pretty strong to the have large journals and alot of overlap and again I have heard 700-800 hp+
This assumes a clean and well tuned engine, a poor tune can destroy an engine at stock hp levels.
1991 LX Mustang 347 C4 combo 11's with the AC on.
1984 Mustang GT 460, Powerglide "Still putting it together" hoping for 9's !!
1929 T-Altered "In the works" 8's are on the horizon
[ This Message was edited by: dfree383 on 7/15/06 2:08am ]
[ This Message was edited by: dfree383 on 7/15/06 2:10am ]
RAY WITHROW OUT OF TEXAS WHO BUILDS WRE CUSTOM RODS HAS RACED 460 'S FOR ALOT OF YEARS, HE SAID AT 800-850 IT WILL START TO PULL THE MAINS OUT OF THE BLOCK.I DONT KNOW IF THAT WOUKLD BE W OR W/OUT A MAIN GIRDLE.
The girdles are only good for holding everything together when it splits !! They are pretty useless as you still only have 2 bolts holding the cap (They still Walk) the only effective way to solve the problem is to spread the load out (I.E. 4 bolt caps) and spread the stress over a larger area.
"2010 New Years Resolution - Break into the 15's with a JA Custom Cam and Buy a New AMERICAN Truck"