I am in the process of tearing down the top-end on my 05 RoadGlide. I purchased the bike second hand a year or so ago therefore I am not able to speak to the previous owner. I did however speak with a local HD dealer who looked up the vin and told me that it had a 95" SE Big Bore Kit, S&S 510 gear drive cams and a S.E. 6 speed installed at the dealer before delivery to the original owner. I've added 3;37 gearing and a 2-1 pipe. Looking to get the heads freshened up and increase my HP and TQ. I'm a big guy pushing 275. I do most of my riding in the 2200-5500 range. Reliability and NO DETONATION are paramount to me. The motor currently sits at just under 60xxx miles. I have a set of s&s 570g cams on my workbench that I can install to help improve the performance over my current 510G cams. In doing research it seems a maximum ccp of 190 and compression in the 9.8 area is safe and suggested with the 570G cams especially in a bagger. With the 510g cams I am getting approx 150-160 CCP now with no detonation at all. Since the 510 cams and gear drives were installed at delivery when new I i wonder if I need to have lash and run-out re-checked again with a new cam install? The 570 cams are listed as "bolt in" Will there be any concern of piston to valve problems with these cams? I do not want to remove the jugs and pistons for any clearincing work...What is everyone's thoughts on the 510-570 upgrade and what I should be looking for in headwork.
Many thanks in advance for any input anybody cares to share

 

In order to establish the proper compression/increased valve size, and using a S/E cast piston(?), the valve reliefs most likely will have to be re-machined, as the as-cast pistons are just that.....a casting.
I responded to your e-mail questions.
Scott

 

Headwork would be adviseable, the '05 heads were some of the worst the MoCo put out. The did have 7mm valves and beehive springs but many had bad guide seals. I have an '05 FXSTD and the guide seals were replaced under warranty. As Scott points out, larger valves often make contact with the SE flat tops; the valve reliefs should be opened up to accommodate larger valves.

In order to see the compression target of 9.8 static and CCP at 190psi, the chamber volume will have to be reduced to about 76cc and when that much material is removed from the heads, sometime intake manifold fitment becomes an issue. In order to get the CR/CCP up where you want it with a late closing intake event like with the 570 cams a major slice off the heads or the replacement of the flat top piston with a domed piston will be required. You might want to consider the S&S 583 in lieu of the 570. Much earlier intake close which will get the CR/CCP up where you want it with a .030" head gasket; no major head cut or domed piston required. Combine that cam with decent Stage I porting and a good tune and you should be pleased with the results.

Might want to check crank runout as well. I ran gears in my 95" '05 FXSDT at .0025" runout and years later when I redid the top end, crank runout had grown to .0045".

 

Boring to 98" would address the valve clearance issue, and compression issue in one fell swoop.
Scott

 

Throw in a 3cc dome piston for that late IVC 570; Love spending OPM.

 

Good points all. Thanks for the input...Well the heads will be off this week so I need to finish the game plan and get the heads out for work this week. I'm Not 100% sure but The more I think about this (time x money) the more I think a true drop in cam should be my route . I do not want to pull the jugs so I guess the question should be weather I should stay with the 510's or look at the 37's & the 6's with good second level head work.

 

Good points all. Thanks for the input...Well the heads will be off this week so I need to finish the game plan and get the heads out for work this week. I'm Not 100% sure but The more I think about this (time x money) the more I think a true drop in cam should be my route . I do not want to pull the jugs so I guess the question should be weather I should stay with the 510's or look at the 37's & the 6's with good second level head work.

 

S&s 583

 

Install SE1.725 non roller rockers while the heads are off. And leave the cams in there.

 

Big guy, heavy bike and the OP wants to have power at 2200 rpms which will require more compression or lower gearing. Two ways to increase CCP; smaller chambers or earlier intake close or a combination of both. Can't get there with either of the cams referenced in the OP, or the 37s or the Woods 6.