875-1 lifters
Road Captain
Joined: Jan 2008
Posts: 667
Likes: 59
From: Lufkin, Tx.
I ran the 875's in a fatboy I used to have with 12/1 comp and tw68's , could have used other lifters just wanted to try these. I don't remember now what I set the preload at because it's been too long ago. I had no problems with them when I ran them though. I would try calling comp cams again and see if you get someone else. I called them when I got mine and actually had good luck with them on the phone. Wish I could be more help on the preload I just don't remember what it was.
Road Master
Joined: Mar 2013
Posts: 817
Likes: 380
From: Central Ohio
Comps site says .0416, and increase by one flat preload if noise is present on warm engine. It also states 1 turn, but that's at 24tpi not 32.
Nothing wrong with the 875 lifters, I'd use them. You're running a cam that peaks above 5krpm, and woods stuff is supposed to have aggressive ramps. They would benefit from the travel limited lifters IMO. A hyd roller setup is heavy, might as well try and make the best of it.
Nothing wrong with the 875 lifters, I'd use them. You're running a cam that peaks above 5krpm, and woods stuff is supposed to have aggressive ramps. They would benefit from the travel limited lifters IMO. A hyd roller setup is heavy, might as well try and make the best of it.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
Comps site says .0416, and increase by one flat preload if noise is present on warm engine. It also states 1 turn, but that's at 24tpi not 32.
Nothing wrong with the 875 lifters, I'd use them. You're running a cam that peaks above 5krpm, and woods stuff is supposed to have aggressive ramps. They would benefit from the travel limited lifters IMO. A hyd roller setup is heavy, might as well try and make the best of it.
Nothing wrong with the 875 lifters, I'd use them. You're running a cam that peaks above 5krpm, and woods stuff is supposed to have aggressive ramps. They would benefit from the travel limited lifters IMO. A hyd roller setup is heavy, might as well try and make the best of it.
Road Master
Joined: Mar 2013
Posts: 817
Likes: 380
From: Central Ohio
Valve float. I don't see how compression affects it as much as the cam ramps/ lift/ rpms. That cam peaks at 5500-6000, and a heavy valve train with stock springs needs all the help it can get. You would be more likely to get away with running high rpm and stock style lifters if it had stiffer springs to combat pumping the lifters.
If the OP won't be turning his engine that fast, perhaps his cam choice should be questioned.
I've always ran travel limited / Hi rev / anti pump lifters in SBC setups. Never had a reason NOT to.
If the OP won't be turning his engine that fast, perhaps his cam choice should be questioned.
I've always ran travel limited / Hi rev / anti pump lifters in SBC setups. Never had a reason NOT to.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
Valve float. I don't see how compression affects it as much as the cam ramps/ lift/ rpms. That cam peaks at 5500-6000, and a heavy valve train with stock springs needs all the help it can get. You would be more likely to get away with running high rpm and stock style lifters if it had stiffer springs to combat pumping the lifters.
If the OP won't be turning his engine that fast, perhaps his cam choice should be questioned.
I've always ran travel limited / Hi rev / anti pump lifters in SBC setups. Never had a reason NOT to.
If the OP won't be turning his engine that fast, perhaps his cam choice should be questioned.
I've always ran travel limited / Hi rev / anti pump lifters in SBC setups. Never had a reason NOT to.
However, I just don't see any difference when considering the HD valve train between a conventional lifter that would have to pump up .100" to a TL lifter that would have to pump up .050" to float a valve. Seems to me one setup works as well as the other. I don't see valve float to be an issue with the TC motor unless the motor consistently sees 7000 rpms.
It is a common misconception, that TL lifters are are anti-pump up but actually they are to keep the lifter from collapsing. With early evo lifters and oil pump you could gain a little high rpm power by using limiters or solids because they would not lose lift and duration at high rpm, but the most common use was to get higher compression street motors to crank over when hot.
At the end of the day, what lifter one runs is one's choice. I just don't understand why one would choose TL lifters when they are not needed but that's just me.
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Road Master
Joined: Mar 2013
Posts: 817
Likes: 380
From: Central Ohio
To each his own I guess. I do agree that it may not be necessary, but an engine that will peak close to 6k, I'd rather plan for some overrev.
I know the valve train is different, but I'd say similar enough to compare. After all, how many pushrod v8's use adjustable pushrods? If they do on max effort setups, its got mech lifters, so there's extra weight we are carrying. But at the same time, a lighter rocker setup.
And lastly, I know lifters aren't "anti pump" just because of being limited, but most also have a higher bleed rate. I've never read into mechanical setups on HDs, might have to do some digging.
I know the valve train is different, but I'd say similar enough to compare. After all, how many pushrod v8's use adjustable pushrods? If they do on max effort setups, its got mech lifters, so there's extra weight we are carrying. But at the same time, a lighter rocker setup.
And lastly, I know lifters aren't "anti pump" just because of being limited, but most also have a higher bleed rate. I've never read into mechanical setups on HDs, might have to do some digging.
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
I don't disagree and not trying to get into a pissing contest; however, a SBC valve train is quite different than the HD valve train. The SBC setup will consistently see higher rpms and there are four times as many opportunities for valve float and I can easily see the justification for TL lifters in that application.
However, I just don't see any difference when considering the HD valve train between a conventional lifter that would have to pump up .100" to a TL lifter that would have to pump up .050" to float a valve. Seems to me one setup works as well as the other. I don't see valve float to be an issue with the TC motor unless the motor consistently sees 7000 rpms.
It is a common misconception, that TL lifters are are anti-pump up but actually they are to keep the lifter from collapsing. With early evo lifters and oil pump you could gain a little high rpm power by using limiters or solids because they would not lose lift and duration at high rpm, but the most common use was to get higher compression street motors to crank over when hot.
At the end of the day, what lifter one runs is one's choice. I just don't understand why one would choose TL lifters when they are not needed but that's just me.
However, I just don't see any difference when considering the HD valve train between a conventional lifter that would have to pump up .100" to a TL lifter that would have to pump up .050" to float a valve. Seems to me one setup works as well as the other. I don't see valve float to be an issue with the TC motor unless the motor consistently sees 7000 rpms.
It is a common misconception, that TL lifters are are anti-pump up but actually they are to keep the lifter from collapsing. With early evo lifters and oil pump you could gain a little high rpm power by using limiters or solids because they would not lose lift and duration at high rpm, but the most common use was to get higher compression street motors to crank over when hot.
At the end of the day, what lifter one runs is one's choice. I just don't understand why one would choose TL lifters when they are not needed but that's just me.