Ok, so I'm back on using a stock block. I just see threads of split blocks even at relatively low power numbers and get scared. I broke the crank and block in my '85 GT and it only put down 220hp and 270ftlbs to the wheels. I was just driving it with the cruise control on when it went.
High rpm and a bad tune up . They just went 5.08 to the 1/8 with a Stock production block in a fairmont . I’ve seen much higher hp stock block stuff lately , not that I am an advocate but I believe the tuning and tuners are a lot better and not rattling them apart at the same rate they used to .There is a very good reason for that. Nobody starts a thread for a block that didn't split. I put almost 500hp to the tire on a 347 stock block, and it lasted 85,000 miles before it had a failure unrelated to the block. I didn't make a thread for it.
300 whp on a stock block is well within the safe margin. With TF170cc heads, I would stick with the stock stroke. Those heads don't flow enough to make a 331 worth it. I would use the money towards a good tune. Don't rev it up too high. High RPM is usually what splits a stock block. With TF170 heads, there won't be any reason to rev it higher than 6500rpms, not even that high really.
Kurt
High rpm and a bad tune up . They just went 5.08 to the 1/8 with a Stock production block in a fairmont . I’ve seen much higher hp stock block stuff lately , not that I am an advocate but I believe the tuning and tuners are a lot better and not rattling them apart at the same rate they used to .
They are still very erratic and nothing consistent about one vs another staying together but it’s definitely impressiveIt's a great discussion to be had. All these people doing LS swaps because the block can handle a few more hp. The stock 302 got a reputation for splitting back when no one did a tune, and half the people making that kind of power had ripped the fuel injection off and put a toilet on. Now what's his name up in South Carolina is putting over 900hp through a totally stock short block. Maybe it's time to go back and see if the block was really the problem.
Kurt
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