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[hrdtail78]

This statement is not true
Changing ratios increases the lift rate, effectively adds a small amount of duration, and may cause an adverse effects for a lot of reasons. Think about what the added lift gets you on the exhaust side. .574 to .600+ lift. Where is the motor at in the point of the exhaust cycle near maximum lift? The blow down event has been over long before. Plus this cam is opening the exhaust VERY early already. So if there were any gains to be made on the intake side you then potentially give it back on the exhaust side. That said the exhaust is not ideal for a cam this short.

If you use either the R&R or the MVA heads, both which I am very familiar with, consider a new cam. The Feuling 574 is a poor choice lifted or not.

Does it actually change duration or just at advertised .053? 

Is this a 110 and what is the compression?  I have wondered what a DM598, but the R&R 615 would make sense with the heads.

[dnlpnd]

Does it actually change duration or just at advertised .053? 

Is this a 110 and what is the compression?  I have wondered what a DM598, but the R&R 615 would make sense with the heads.

So, if you could pick any chain driven cams out there, what cams would you recommend for the R&R Stage V heads with the 2.00 intake and 1.625" exhaust sitting atop the new SE 117 Kit w/SE 58 throttle body? (decking heads to ~10.5:1)

[Yellow09SERG]

So, if you could pick any chain driven cams out there, what cams would you recommend for the R&R Stage V heads with the 2.00 intake and 1.625" exhaust sitting atop the new SE 117 Kit w/SE 58 throttle body?

Thanks,

dnlpnd

You will end up with as many answers as the are cams with that question. The best answer would probably come from you and what you expect the motor to do and where you want it to do it at would narrow things down for you some

[dnlpnd]

You will end up with as many answers as the are cams with that question. The best answer would probably come from you and what you expect the motor to do and where you want it to do it at would narrow things down for you some

Ended up going with the GMR-600 cams, using stock rocker arms for my 117 build.

dnlpnd

[kcbike]

May we see the dyno results when you have them ?

[HD Street Performance]

Does it actually change duration or just at advertised .053? 

Seat to seat remains the same, 0 lift times XXXXX = 0,
The added ratio enables .053 to occur slightly sooner and remain longer until .053 occurs on the closing.

[GMR-PERFORMANCE]

Well if the arm is longer after 0 it will add what ever it can add over the stock ratio.. I am keeping it simple as the longer arm deal comes down to testing back to back to see if you get any changes.  I would start with intake first, and see what you get..

Here is but one test bike  2009 107 R&R cast heads stage V HO ( 315+ CFM ) comp ratio 10.8 zilla HPI 55 crane 296 

stock rocker  123.88 hp 121.13 tq  VS  1.7 S&S rocker  124.04 hp 121.67 tq   this was back to back on the dyno. Pull tank swap rockers re adjust the push rods and go again..    To me that is a flat out draw and nothing came from it , yes we also tried a few other cams and the results where pretty much the same.

In some case's you might get it to work , but until you do a back to back you really cannot make the statement one way or the other.. I tell guys leave the stock one's in there for a street driven bike.. 

You have a 15,1  comp ratio drag bike a well thats a new test ..

[dnlpnd]

Well if the arm is longer after 0 it will add what ever it can add over the stock ratio.. I am keeping it simple as the longer arm deal comes down to testing back to back to see if you get any changes.  I would start with intake first, and see what you get..

Here is but one test bike  2009 107 R&R cast heads stage V HO ( 315+ CFM ) comp ratio 10.8 zilla HPI 55 crane 296 

stock rocker  123.88 hp 121.13 tq  VS  1.7 S&S rocker  124.04 hp 121.67 tq   this was back to back on the dyno. Pull tank swap rockers re adjust the push rods and go again..    To me that is a flat out draw and nothing came from it , yes we also tried a few other cams and the results where pretty much the same.

In some case's you might get it to work , but until you do a back to back you really cannot make the statement one way or the other.. I tell guys leave the stock one's in there for a street driven bike.. 

You have a 15,1  comp ratio drag bike a well thats a new test ..

  totally agree!