what cam lift will stock 15 flhx heads support
#1
#2
If you're not going to do any head work with everything that you've stated that you're planning on swapping out it's pretty much going to be a waste of money. If you're not going to allow the engine to breath then all the high lift cams, big bore TB's, and high compression pistons in the world won't get you anywhere. You're going to end up with a dog that's going to be almost impossible to tune correctly. You've got to match all the components of a build not just 3/4 of them. And yes you should change out the springs if you decide to continue. A stock OE head will support a cam lift of .560 and .590 with the upgraded springs.
Last edited by OldEnuf2NoBtr; 11-29-2015 at 11:02 PM.
#3
If you are just looking for some improvement, forget the 58mm T/B and stay away from cams with much later intake valve close events (like the 259) that will reduce CCP. If you must stick with HD cams, the SE204 will work and those that have installed that cam with 1.7 ratio rockers have had some surprising results. If open to aftermarket cams, the Andrews 48 would work well also.
These suggestions are made in the context of a cam only upgrade. As the previous post suggests, head work makes everything better and opens up cam selection to many others. But without head work, the components like the 58mm T/B, 10.5 pistons and longer cams like the 259 are a waste of money. JMHO.
Last edited by djl; 11-30-2015 at 10:46 AM.
#4
Stock springs will support up to .575 lift in most applications
__________________
Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
#5
#6
just to let all know I did this build the way I said I was going to do it ..I did put the heavy springs in the heads and seals with no head work ..I did put the 58 mm on with 259 cams and 10.5 to 1 screamin eagle pistons and im very impressed bike runs great and is very strong ...my numbers are 105hp and 114 tq ....I did this build very cheap because im a shopper and I do my own work.... very little money spent with great results
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Harley1004 (04-18-2022)
#7
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#8
just to let all know I did this build the way I said I was going to do it ..I did put the heavy springs in the heads and seals with no head work ..I did put the 58 mm on with 259 cams and 10.5 to 1 screamin eagle pistons and im very impressed bike runs great and is very strong ...my numbers are 105hp and 114 tq ....I did this build very cheap because im a shopper and I do my own work.... very little money spent with great results
#9
Actually, OEM springs from '07 up will support .600" lift but, due to sloppy factory tolerances, it would be a good idea to check for coil bind during installation. The stock springs are fine unless you intend to spend a lot of time above 5000rpms. Contrary to others and for most applications, heavy springs are not required and contribute to valve train noise; a minority opinion for sure but mine none the less.
If you are just looking for some improvement, forget the 58mm T/B and stay away from cams with much later intake valve close events (like the 259) that will reduce CCP. If you must stick with HD cams, the SE204 will work and those that have installed that cam with 1.7 ratio rockers have had some surprising results. If open to aftermarket cams, the Andrews 48 would work well also.
These suggestions are made in the context of a cam only upgrade. As the previous post suggests, head work makes everything better and opens up cam selection to many others. But without head work, the components like the 58mm T/B, 10.5 pistons and longer cams like the 259 are a waste of money. JMHO.
If you are just looking for some improvement, forget the 58mm T/B and stay away from cams with much later intake valve close events (like the 259) that will reduce CCP. If you must stick with HD cams, the SE204 will work and those that have installed that cam with 1.7 ratio rockers have had some surprising results. If open to aftermarket cams, the Andrews 48 would work well also.
These suggestions are made in the context of a cam only upgrade. As the previous post suggests, head work makes everything better and opens up cam selection to many others. But without head work, the components like the 58mm T/B, 10.5 pistons and longer cams like the 259 are a waste of money. JMHO.