Wurk Truk..... besides cc'ing your heads did you do anything else to your heads? Any porting etc??

 

here are to of my bikes with the 54h cam.the blue line is the cam,se air cleaner,d&d 2 into 1 pipe,hd 103 kit,and 16952-08 mcr se heads,stock head gasket.red line iscam,se air cleaner,new vh pro pipe chrome,s&s 106,stock heads,stock head gasket.so,do you need head work or heads?depends on how you ride.the chart speaks for its self.personally i have a set of mcr heads on order.

 

gotta do head work. More cc's to fill with air. I didn't get to feel hp from my 106" until I got head work done. Now she takes off top end just like she does bottom end. great build.

 

The 106 with zero headwork will likely land right at optimum compressin of 10.2/1 with a .030 head gasket assuming the pistons are near 0 deck height.
I have done several with those cams and motor size

 

Exactly. And if the pistons sit proud... I think it is better to run a squish of UNDER 040 than one under 030. Seems to me that a squish under 030 wouldn't be the best for a bagger.

I do have porting, and larger intakes. But feel that stock unmolested 06+ heads would do really well, too.

 

I do have porting, and larger intakes. But feel that stock unmolested 06+ heads would do really well, too.

IME the differance is the torque curve will be extended on the right and not fall until ~500 rpm later and the hp will rise 5-7. Torque will peak slightly higher and low end off idle to 3k will remain the same assuming the compression is left equal. At this point with a 106-107 the TB is just starting to become the constraint.

 

Thanks Don, thats great. By Zero headwork, does that include cc'ing the heads??? Or do you mean literally no headwork, like just bolting them back on with a .030 hg.....

 

With a 106" build with stock heads and no headwork.... would you suggest going for a bigger TB???...... OR only if porting and using larger intake valves?

Thanks.

 

IMHO... a larger TB would impact low speed (under 3500) operation.

More to the point is this IS a great combo, but the exhaust will play a MAJOR role in making this all come together. I have 117 tq, and it crosses 100 at 2200rpm. But a different exhaust could change that entirely. Tune is important too.

 

The 106 will be right at the spot where with flatops and that cam the CR will be close to optimized. CCing the heads would be smart to get them equalized but that can be done without milling assuming they are close, or mill one slightly to bring them to equal, depends on the volume they measure what to do.
If doing headwork sure go for the 1.9" valve and don't scrimp there. The HP I mention will not come without added airflow potential (verified by flow testing on a bench) and the valves help that but I use a stock exhaust size both are premium AV&V parts.
The TB will not be of any help without the headwork. These parts work together and always the assumption is the pipe and tune are good.