Guys,

Keep in mind we are still running the stock heads and exhaust. Conventional wisdom says we won't see much over 5300, maybe 5400 RPM. We haven't commissioned the cam yet, but he's telling me this cam will help pull more out of the engine at the RPM the heads and exhaust will allow for. I'm being told by several who have dealt with the builder that valvetrain is his guru zone, and he's used to building WAY more engine than mine.

And, yes.... I am kind of leaning on the fact that I had WAY less spring pressure before (unless they were changed at some point; I will ask), and the engine ran fine. I haven't been given any indication that spring pressure had a hand in the piston failure.

I will be seeing the builder today (he wants money to pay the machine shop and commission the cam), so we will be discussing this.

Thanks. Brad.

My advice..... buy a stock take out 496 and go boating. Give me $5k and I'll kick you straight in the balls....this will be much cheaper and painless in the long run....lol

:)

TikiJoe,

Yeah…. We’re WAY past that point. Besides, we weren’t “stock” before the failure. I ain’t going backwards.

Thanks. Brad.

https://cimg8.ibsrv.net/gimg/www.off...d724ae3d0.jpeg

These springs aren't making sense. They are 122lbs @ 1.900" installed height, Max lift on the spring 0.640" your cam is 0.627" and the spring needs more than 0.013" shim to achieve 160lbs seat pressure. Your into coil bind at 1.200". Does the builder know the cam specs?
Please someone correct me if I'm wrong.
https://cimg7.ibsrv.net/gimg/www.off...7f26684244.jpg

are those titanium valves? rarely see ones beat up like that.

Nope.

Rookie,

Your math makes sense. It is possible that we zeroed in on a spring before deciding to go with a new cam, and then it was out of sight, out of mind. I am running this down with the builder.

Thanks. Brad.