Originally Posted by markdunlap
I am looking at K-1 Technologies BBC H beam rods for a new 496 engine.
I already have a 496 with Eagle rotating assembly and want to try to upgrade slightly without breaking a $500 budget range.
Anyone got results on these K-1's?
They are 4340 material, come with ARP 2000 bolts and weigh about 740 grams in 6.385" length. Forgings are overseas but don't know where they are machined.
k1 crank and rods are all china forgings just like everyone else. there is NO difference @ all. if you can get a good deal on these buy them. the bolt has little to do with breaking as people have said. the 8740 bolt is about 10 times stronger than what is actually needed. 190,000 psi is a lot and than that is x 2. the ability for the bolt to keep the cap preloaded is what makes the rod bolt and rod never come apart. if the stretch of the bolt is not around 80% of its yield, sooner or later with elongation events happening because of situations like rev limiter being hit all the time, rod bolts generally don't fail when stretched to proper yields. that lack of proper preload is always the case. L19 bolts are very hard and they loose nothing from just sitting around. there are things called manufactures defects that can happen to anyone @ any time, but usually the part fails because of the installer. when metals are made, there are procedures that are used to insure proper bonding and no bad bolts come out. it does happen but usually the heat treat or something else was over looked.
stock old 40 year old 3/8 gm bolts for the sbc and 7/16 bolts for bbc were used at rpms that the engine should of never seen and they never failed with stock rods and cranks. with today's manufacturing and technical advancements, the stuff that is out there today should never fail!