Hydraulic roller maximum...

[Mr. Luos]

Looking to maybe up my cam a little. I do not want solid roller.
In a 402....11:1.

What kind of duration and lift would be maximum? Morel lifters, Dual Gold springs.
I haven't researched it all the much lately.
Currently = 248/254 629/622 113

Looking at something like a 254/258 633/630 111-112

TIA!

[Firebirdjones]

Piston to valve clearance is really what is going to dictate your "maximum" allowable lift and duration numbers. Not to mention retainer to valve guide clearance issues that sometimes require remachining...

What are you looking to do???

If it were me I would consult with a reputable cam manufature and have a custom grind done. It's what I have done for several years now and have found it more beneficial than off the shelf grinds.

[Frost]

Call Cam Motion and see what they spec.

[Mr. Luos]

The new cam would be a custom grind.

I am just looking to bump the top end power a touch.

[Frost]

From your earlier post.... going from 113 to a 111 LSA will actually bring the power band down and make more tq in the middle to high-middle, even with the extra 2 degrees tacked on. DCR will go up, so that needs to be calculated. You don't want something with too much DCR for pump.


-edit- misread the intake duration of the 'new' that you posted. The same applies for the LSA though.

[Mr. Luos]

Something tells me I won't do this...
I have a FAST getting ported by Tony Mamo right now, so hoping that helps with that peak. I will just wait and see how that helps.


And the DCR is fairly low...wouldn't be too concerned upping it a bit.