[DieselEater]

I'm looking for the short general answer here....

I've got a 14 : 1 compression 470 inch solid roller BBC...My current cam has a net lift of .650 with a 280 dur @ .050 110LSA. Timing locked out at 38 Deg. 1050 dommie

I am in Colorado, so air is thin.

For a quick answer.......would I gain more or less than 30 HP at 7500RPM with a .700 lift cam?

Thanks,


A...........

 

[BillyGman]

short answer is: I think it depends on the rest of your combo. Especially the cylinder heads being used. If the heads flow enough to fully support and take advantage of a bigger cam, then I think that a 30 HP gain wouldn't be out of the question. The intake manifold choice would be a factor also, and I think to a lesser degree the header primary tube size as well. I believe that if you hire UDharold for the new cam choice, you would not be disappointed.

 

[cstraub]

Need head specs, rocker ratio. In high altitude over lifting does help but without more info can't tell you...

 

[540Hotrod]

As mentioned...heads are key factor AND are the two cams going to be comparable otherwise?

But for a quick reference, I just did a 555" with Dart CNC 335's. Going from a .696" (1.8 rockers) 270* flat tappet...to a .788" lift 268* solid roller barely picked up 30 or so HP.

JIM

 

[DieselEater]

Running cast iron Merlin 320's rect. Port matched intake, but stock otherwise. Cannot run aluminum due to rules. 1.7 ratio rockers

As far as the cam, I would imagine the duration, lsa would stay similar, unless something different would be better?

No idea what the heads will flow, but they should support way more than the .650 cam is providing...

2.300 1.88's valves

Would longer ratio rockers be a cheap and easy way to test the response of a bigger cam???


Thanks,

A.........

 

[BillyGman]

Would longer ratio rockers be a cheap and easy way to test the response of a bigger cam???


Thanks,

A.........

Maybe. I'm no expert in that, but I dunno how much difference you can really expect to see going from 1.7:1 ratio, to a 1.8:1

I think you would be better off talking to an experienced cam expert on this. JMO.