I recently purchased Pistons and Ring Kit and Cam Bearing. The Pistons I bought were Speed Pro L2256F which are Forged SBC350 pistons 30 over. The Rings they sent with the pistons where Hasting 139 30. Has anyone hear of them and are they any good? I also bought cam bearing. The brand is Durabond, are they any good and what have you heard about them. Thanks

 

Both extremely familiar brands.

Hastings rings are mostly relatively low-perf, designed for fast break-in and good street behavior. They are particularly good at having low oil consumption. They don't take well to nitrous and such, or other abusive treatment. But depending on what you're going to use the motor for, they could be just fine.

Durabond is one of the mfrs of the aluminum compound cam bearings. Widely used in about every kind of application.

Those are the single most common TRW piston part #.... even now that SpeedPro owns that product line. Be aware, that they are an extra .020" "down in the hole" at TDC, compared to stock; which makes their deck clearance .045", more or less. Be sure to take that into account when doing compression ratio "calculations". To give you some idea of the effect, if you "calculate" the compression ratio of a .030" over 350 with 64cc heads, 6cc valve reliefs in the pistons (about what the 2256F has), and .039" head gaskets such as FelPro 1004, it comes out to 10.3:1 with .000" deck clearance (pistons level with the deck at TDC), 9.7:1 with the stock .025" clearance, and 9.3:1 in an untouched block. A common cause of poorer than expected performance and over-camming; and of people saying that they have some arbitrarily high compression, say 10.3:1, but also saying that they can run pump regular without pinging. Because, they DON'T have a 10.3:1 CR.