Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: Streetwize]
#1685204
10/13/14 04:36 PM
10/13/14 04:36 PM
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Joined: Jun 2005
Posts: 2,776 Ontario Canada
MattW
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Quote:
Harland Sharps, Hughes or Comp Pro Mags?
I know the T&D's would be best and if I were racing every week-end I'd probably opt that way.....but of the 3 I've listed which are best and (more importantly) why?
I'm leaning toward the Hughes right now because I've had good luck with their BB rocker gear before.
I have a brand new set TD for INDY 360 CNC heads for sale. Don't know if this would help you or not. 1.65 ratio. Matt
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: MattW]
#1685205
10/13/14 04:55 PM
10/13/14 04:55 PM
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Anonymous
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Anonymous
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Marsh Perf 336 283 0800 Harlands and race them until you retire then sell them.
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: 340B5]
#1685207
10/13/14 05:26 PM
10/13/14 05:26 PM
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Joined: Jan 2003
Posts: 9,892 Weddington, N.C.
Streetwize
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I made an easy test hit the new Bullet cam shifting at 5800 and it felt like she wanted to go 6800+ , that's what I'm worried about.
The Standard Comp SS Mags are way overtaxed now.... I think Comp only rates for like 350 open, but I know they were holding up fine with the milder "endurance" Cam Motion that was 261/268 @ .050 and .585/570 lift , This new cam is 260/269 but much more aggressive lobes .668/.645 at the valve on 1.5's so I gotta make the change or cry about it later.
Last edited by Streetwize; 10/13/14 05:28 PM.
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: Cab_Burge]
#1685213
10/13/14 11:51 PM
10/13/14 11:51 PM
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Joined: Jan 2003
Posts: 9,892 Weddington, N.C.
Streetwize
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All good advice, thanks everybody!!
I think Vic told me there's as much as .040-.045" lift loss on a 59 degree smallblock due to the bad geometry/lost motion of the pushrods.of that's the case you almost need a 1.6 to net the theoretical 1.5.....unless the rocker ratio compensates for the lost motion to give you the true lift at the valve.
Need to bone up, never gave it much thought in a while...
Last edited by Streetwize; 10/14/14 01:45 PM.
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: Streetwize]
#1685214
10/14/14 09:27 AM
10/14/14 09:27 AM
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Joined: Dec 2006
Posts: 1,178 Indy
FlyFish
super stock
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super stock
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I would go with the comp pro mags. I tried to fit the Harland Sharps on my motor a few years ago, but they would not clear my 1.54" springs (not even close). My old style comp pro mags clear fine...but they are the old ones that are not bushed, so they can't take much more than my current 460# spring pressure without galling the shaft. With the new comp pro mags they fixed this issue by bushing them.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: Streetwize]
#1685216
10/14/14 01:06 PM
10/14/14 01:06 PM
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Joined: Jan 2005
Posts: 3,635 Oakland, MI
dizuster
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Quote:
All good advice, thanks everybody!!
I think Vic told me there's about .040-.045" lift loss ona 59 degree smallblock due to the bad geometry/lost motion of the pushrods.
I just checked mine when I put it together... It only lost. 014" with a 3/8" pushrod and 380 lbs open.
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: dizuster]
#1685217
10/14/14 01:37 PM
10/14/14 01:37 PM
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Joined: Jan 2003
Posts: 9,892 Weddington, N.C.
Streetwize
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dizuster,
Which rocker gear are you using?
Imagining the variables involved (lifter body/type, cup height in the lifter, Pushrod length, rocker ratio and lateral motion, etc) it's hard to get my head around it being <.020"
I'm not sure the Harland Sharps are going to clear my springs and it looks like the Hughes are only good for 1.5" diameter springs.
I'll get with Hollis and let him do some cipherin'
Last edited by Streetwize; 10/14/14 01:44 PM.
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: Streetwize]
#1685218
10/14/14 02:15 PM
10/14/14 02:15 PM
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Joined: Jan 2003
Posts: 5,895 Florida
Locomotion
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The downside is that it will cost more, unless you can get most of your money back from your current springs. But have you researched to see if there are any beehive springs that would be suitable for your application? That would solve the clearance problems with any rocker set-up you decide on. FWIW, these are the heaviest beehives I've been able to find: PAC-1427 Comp Cams 26056-16 Lunati 74855-16 Bottom line is I guess my suggestion wouldn't help.
Last edited by Locomotion; 10/14/14 03:16 PM.
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Re: Best bang/buck SB shaft rockers for 500# plus springs?
[Re: Streetwize]
#1685220
10/14/14 03:17 PM
10/14/14 03:17 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
The only downside I see with the Comps is I'd have to get all new pushrods
That assumes that whatever brand of rockers you're looking to replace happens to use the same length as one of the other brands you're considering. I know from mocking up a bunch of different BB rockers one time that only 2 out of 5 brands were close enough dimensionally to be able to actually share the same pushrods. All the others were going to need something w/ different lengths.
Quote:
I've had good luck with both the HS and Hughes before
I like Hughes, not a big fan of HS, but think the Comps are probably the best choice from what I've read above.
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