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This thread about if you can use a stock block and have success with a 4" crank and w-2 heads.

I have a bunch of high HP engines with stock 340/early 360 blocks, [basicly the same as a 340 casting], in service at this time. I have done them with the 4 bolt caps and my opinion it only adds to the cost of the finished project. Same with roller cams, No more power just a lot more money. In fact a couple times I have removed roller cams from customer engines and installed flat tappet cams and car has gone faster. Roller lifters fail and have ruined many a good bottom end. The only block failures I have experienced were due to other parts failing first.




well if removing the solid roller made the car go faster than the rest of the combo was not correct to begin with.
In a correct combo a solid roller WILL be faster. Oh and I have run many rollers including in a daily driven Vette and have never had a lifter failure.





Way to little or way to much spring can contribute to a failure with rollers, but if correct, they live happily for a long time.

,but the problem with rollers is they need a lot of spring ( in a racing application ) due to the lobe profiles and the addidional weight over flat tappet stuff. It's the down side of roller cams / lifters. In milder cam applications (.600 lift area and under ), flat tappet cams compete quite well with roller cams. IMO, roller cams are over sold. Did I mention a lot less moving parts to fail with flat tappet cams. Sorry this is so far away from the OP's original question.

Fastest 300