This'll ! Thats our word for the day. A month or so ago we had quite a discussion about 2 bolt verses 4 bolt main for a street engine. I could not fine that thread ,but the subject was we had a young man starting out wanting to build to build a 350 chevy on a limited budget.Street motor. Several were strongly suggesting that he start out with a 4 bolt main .My contention at the time was he could put his money to better use by applying what money he had to something that would benefit him more. Dont waste the $100 .00 or so that he would have to pay extra for a 4 bolt block. This caused quite a stir, but it was very interesting.I was looking through old magazines the other day, looking for info on heads and cams because that was what we discussing at the time. I pulled out a october 98 issue of Super Chevy and across the top read, 30 STREET ENGINE ASSEMBLY TIPS. If you still have the magazine you might want to look it up. It is a 7 page article . Tip#12 Reads -- TWO WILL DO. Are 4 bolt main caps really necessary? A famous drag race engine builder did some dyno testing on the subject and it seems the magic number is 600 horsepower. Below that the two-bolt equipment will do just fine! the side bar reads, Four bolt main caps aren't always necessary. If your cars engine is making more than 600 horsepower it is a benefit,Otherwise,most street engines need only 2 bolt caps. End of that part of the article!Getting a good size heavy boat on plane puts a tremendous strain on the bottom end of a motor and a 4 bolt is a big benefit . A stock car needs a 4 bolt for real high RPM"s,but it needs it just as much because you use the motor and the gear to slow you down in the corner. that proberly puts more strain on the bottom end than the RPM's do.My first stock car was a 57 chevy, limited sportsman class.I used a 58--283 bored to 292C.I. 12.5 to 1 trw pistons,461 heads cut to about 58 cc's,an old c3bx intake and a 780 holley with an off road z28 cam.I was using a 7:05 gear on my home track,most of the time I would turn it about 7200 RPM. After two years,I felt the motor starting to slow down and put it on the trailer.Had caught it just in time to save most of the motor,The webbing had finally given up. Backing down in the corners was proberly more a factor in the webbing breaking than the RPM's. If I had put the motor in a street car I dont think the webbing would have ever given up.Now! If I were building a pretty strong small block I would definitely want a 4 bolt. If I'm building a good running street motor on a budget,I would use the money more wisely.WHAT DO YOU THINK???