Something else to consider. You could have two roller camshafts, with identical .050 duration numbers, and even identical max lobe lift. The shape, or "profile" of the cam, can absolutely dictate, what the spring requirement is. In otherwords, a 150/400 spring combo, might rev to 6000 without skipping a beat on one of the profiles, while on the other profile, it might loft the crap out of the lifters and slam the valves off the seats.

This is why, millions of dollars goes into lobe design. A lobe that works well for an endurance engine, might not be the lobe you want for a max effort drag engine, and vise versa. The duration and lift might be the common denominator, but it ends there.

I have no problem picking out a cam from one of the big cam companies catalogs/lobe lists. However, the lobes design, is where things get complicated. Most of the major cam companies, have lobe designs, for all different applications. Drag race, street, endurance, marine, and so on. They invest the money and time using spintron testing, and other methods to come up with a lobe profile. This is not to be confused, with a cam recommendation. Designing a successful cam profile, isn't something you can do from your kitchen table. You can however, pick one from a list of lobes that has already been designed and tested and most importantly, PROVEN. Just need to be sure that profile, has actually been designed and tested for a big block chevy with steel valves, with conventional heads, if thats what you're running, and not a LS engine, or ford engine, etc. What is stable in a LS engine, might be a nightmare in a big block chevy at higher rpm. Typically the fix for that, would be throw lots of spring pressure at it, big heavy duty pushrods to handle it, best lifters you can get, stud girdles, and hope for the best.

I have a buddy who's heavy into street racing scene. LS powered 9 second car with a decent shot of spray. I recently saw on his facebook page, that he kept breaking exhaust rockers (jesels). I got to see his engine builder chime in , and talk about how "it is what it is" because of his valvetrain is aggressive. He didn't want to hear about actually fixing the problem, they rather accepted repeated rocker breakage as part of the maintenance program. I simply told him, that if you can't make a LS valvetrain stay together for a car that sees 9 second blasts at a time, I'd hate to see your "offshore engines"...Local builder too, once I saw his ignorant replys, I pretty much ruled out ever bringing anything to that guy. Everyone fails once. Keep doing it over and over, and you are simply losing.

Again, spend what I did and have thes results, I am sure 40,000 is no big deal to you or never spent it and got screwed, I am literally looking for info on what I will be doing..you said what you think, I say what MANY think and I am the jerk, it's internet get over it...

If that was the case with me the "cheater" part failed big time lol

I told bob 700 hp and 6000 rpm, and asked for the parts to get me there, I am not even close, some guys here blame myself building them as the issue and CLEARLY that's not the case, they made 3 hp apart and .3TQ apart, that's a crap build huh? all 16 cylinders pump within 5 psi of each other, crap builder.... the results are not my building the results are not a good combo....

I was shocked at 5500-6000 results also, that's where it should come alive, that's why I think cams are just way too small....

According to about 5 or more other people the cams WILL make a huge change... my carbs are 1050's, intakes good, stainless marine exhaust, those are not the issue....

ON dyno I used 850 cfm of air....

Tim, just slap in a 270/280 @.050 on a 112 .700 lift spin it to 6500rpm and it will add 100hp. Anything less than that and I think it's a waiste of your time and money.

Do you have step nose cams in your engines right now?

It's not even as much about the HP vs the potential disaster issues, yes of course more hp would be good and any cam bigger will help...

Yes I have the step nose

Tim, is your 0-60 time any better with the new builds? How about in the 1/4 mile?

D, none of the above.... Lol