Originally Posted by kvogt (Post 4406000)

Panther your PM box is full.

Thanks for the input in your PM

Originally Posted by HaxbySpeed (Post 4406003)

I would bet the lifters were bleeding down as a result of the new cam profile. On the motors I wrote about earlier that broke the rockers, etc. That customer originally purchased all hi top end components from MK, and it came with the standard morel 4603 lifters. They were doing the same thing on the dyno. They would bleed down, boost would go up, (cam essentially lost a ton of lift) and the motor would lay over. We swapped in the high revs, and the power picked up everywhere, even low end torque. Boost was still a bit high for the power, but not terrible. Unfortunately, those 4603 were acting like shock absorbers, when we put the high revs in, it transferred it all to the top end resulting in broken rockers, and eventually killing a couple of the high rev lifters too.

Originally Posted by HaxbySpeed (Post 4406003)

I would bet the lifters were bleeding down as a result of the new cam profile. On the motors I wrote about earlier that broke the rockers, etc. That customer originally purchased all hi top end components from MK, and it came with the standard morel 4603 lifters. They were doing the same thing on the dyno. They would bleed down, boost would go up, (cam essentially lost a ton of lift) and the motor would lay over. We swapped in the high revs, and the power picked up everywhere, even low end torque. Boost was still a bit high for the power, but not terrible. Unfortunately, those 4603 were acting like shock absorbers, when we put the high revs in, it transferred it all to the top end resulting in broken rockers, and eventually killing a couple of the high rev lifters too.

Originally Posted by Full Force (Post 4405925)

Build specs? that's a huge number for that CI...? curious to see what it was..

Originally Posted by horsepower1 (Post 4406041)

I've run the you-know-what out of the 4603's and never, ever had one bleed down. Blower motors, strip motors, well over 200# seat pressure and 7000rpm. Blown motor ran 6700 and made 853...489 pump gas motor w/871. I had a customer inadvertently run AFR solid roller springs for quite a few hours on a set of 4603's. They are a Pac 1224 and almost 300 on the seat. He said the motors never knew the difference. Not saying yours didn't do what you said they did, just saying...wow...!!

Originally Posted by HaxbySpeed (Post 4406056)

No kidding. Just before that build, I did a procharged 540 with the 4603's that made 1100hp at 6100rpm, no issues.

Originally Posted by Black Baja (Post 4406060)

Have you had any trouble with the large core solid roller stuff?

Originally Posted by 14 apache (Post 4406067)

Like 55MM and Jesel .937 lifter stuff. Just wanted to add that.

Originally Posted by HaxbySpeed (Post 4406071)

Yes, large core solid and hydraulic. Give me a call if you want details, no need to keep flogging the horse here. 604-315-0570