188/208 or 188/220

J

jfk3

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Aug 17, 2011
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Z, I have 04.5 cummins, 6 spd, dd clutch, 64/80 super phatshaft turbo, 90 hp injectors, 5 inch exhaust, banks intercooler & ram, fass fuel system smarty s06 pod, tow 12k camper thru rockys. Which cam, not a puller or racer but want to haul-ass thru the mountains.....Also I'll need springs, rods, and studs????
 
The 188/208 is the better pick for what you want to do, springs for sure, and studs are not 100% necessary but are nice insurance.
 
I guess the 220 would be more so for a truck with some head porting work correct?
 
The intakes are exactly the same and on the same centerline. The only thing that is different is that the exhaust opens a few degrees earlier on the 220 exhaust and closes slightly later. This allows a bigger pulse to hit the turbine wheel and allow better spool.

I suggest the 188-208 for stock turbos to 62mm and sometimes for 64mm's. Anything larger and the 220 exhaust will really help with spool and make more power. With your setup the 188-208 would work well, but if you are wanting to tow in the mountains the 220 will help you spool and stay on top of the fueling, in turn creating lower egt.

With the wider LSA we have on the 188-220-109.25, we have more piston to valve clearance. I know a lot of people have 188-220 clearance concerns but that should not be a concern unless you have had more than .020" cut off of the head and block. In most instances, unless you have a very small turbo,62mm or smaller, the 188-220 will perform better in almost every application.
 
Out if curiosity, when would the 208 be better? Except for clearance issues.

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The 188/208 is an excellent cam. It is right where my truck does all of it's work. I do only have a 62/71/13ss turbo though.
 
Zach, can you explain what the difference in the two different LSAs for the 188/220 are? Also why one is cast and one is steel? Much appreciated.
 
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