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Cam and valvetrain longevity....??? low duration high lift...

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Old 10-01-2016, 04:01 PM
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Originally Posted by Black Baja
I hate to say this but having been born a gear head and a lot of experience racing and wrenching on all sorts of racing stuff. I always kind of new Bob really didn't have any hands on experience. I could tell it was all text book talk which is ok but the text book only gets you so far and hands on real world experience is what really matters. I've been in and around some really bad azz stuff some was designed/ engineered buy guys that couldn't even read or write. So at the end of the day I really can't fault Bob cause he is what he is (textbook) and I had always really known.
same here and the same goes for 1 of the dildo duo.he's talked to enough shops now,,that he has all the secret cam combos and parts to tell you most of the time what could work.you know the saying,,throw enough darts,,once in awhile you'll hit the center.
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Old 10-01-2016, 04:25 PM
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Funny how we were all right huh? Imagine that
Originally Posted by ICDEDPPL
Marine Kinetics Bobbby is an excellent snake oil salesman with a good amount of conman built in.
Great at never putting anything down in writing to bite him in the ass later.
Feel bad for Orlandi Performance, Brian was severely bamboozed to the point old Butt Hurt Bobby was pulling the strings behind the scenes and Brian was making phone calls to peoples work getting them in trouble, not to mention getting kicked out of here over it. ( mods should reconsider letting him back in imop)

I am however enjoying being able to speak out about BHB without having to wear 3 sets of flame suits around here finally.. he has cost many people a lot of $$ and pain and suffering.
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Old 10-01-2016, 04:32 PM
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This stuff here is my satisfaction... If my issues cost me money, and frustration fine, but others learning and moving on from him, makes it worth it sadly I was out thousands but oh well....
Originally Posted by endeavour32
I've been reading about this issue from Tim, and you over the past year. What really bothers me is Bob never chimed in once! A few years ago I was having Joe run some numbers for me. Then I get a phone call, saying I'm getting really bad advise followed by a dozen technical reason why the combo I was going to run would suck! I ended up getting into a year long chit storm of arguments with, Joe, Mike, Kevin and Dan. Never once did Bob jump in and say what I was saying was correct. Maybe because it wasn't correct. A little over a year ago I was buying some stuff from a guy with a Nor Tech up by Fox Lake. Guy said he installed a MK cam and lost 5 mph vs the 651 that was in prior. Like all of you are saying here, Bob had every excuse under the sun as to what he (boat owner) did wrong and that the cam was not the issue.

I've been a Bob cheerleader for a long time, but today that ends. If you make a mistake own up to it! With that said- I'll own up to my mistake of listening to Bob and not others on here trying to give advise. Then telling them they don't know what they are talking about, BUT being told by Bob to not repeat what I was told- or say it was he that told me. Whatever live and learn!
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Old 10-01-2016, 04:35 PM
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Me too!!! Lol

Originally Posted by Black Baja
I sure hope so. I'm tired of all the 600hp 540's around here...
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Old 10-01-2016, 04:38 PM
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I am away with family today, barely been on, Mild post pics I sent if you feel it helps, installed height and springs.. Or whatever Joe knows every last detail about what I find... Feel free
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Old 10-01-2016, 04:44 PM
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So, what are you guys thinking ?

Something like this ? NArrower centers ? Something larger ?

Brand:Crane Cams
Manufacturer's Part Number:168771
Part Type:Camshafts
Product Line:Crane Hydraulic Roller Camshafts
Summit Racing Part Number:CRN-168771

UPC: 021174045079
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,600-6,200
Intake Duration at 050 inch Lift: 240
Exhaust Duration at 050 inch Lift: 248
Duration at 050 inch Lift: 240 int./248 exh.
Advertised Intake Duration: 302
Advertised Exhaust Duration: 310
Advertised Duration: 302 int./310 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.621 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.632 in.
Valve Lift with Factory Rocker Arm Ratio: 0.621 int./0.632 exh.
Lobe Separation (degrees): 114
Computer-Controlled Compatible: No
Grind Number: HR-240/365-2S-14 IG
Valve Springs Required: Yes
Quantity: Sold individually.
Notes: Camshaft incorporates an integral cast iron distributor drive gear. An aluminum-bronze distributor drive gear not required. 10.5 to 12.5 compression ratio advised. Also fits 502 c.i.d. engines.
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Old 10-01-2016, 05:02 PM
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Originally Posted by SB
So, what are you guys thinking ?

Something like this ? NArrower centers ? Something larger ?

Brand:Crane Cams
Manufacturer's Part Number:168771
Part Type:Camshafts
Product Line:Crane Hydraulic Roller Camshafts
Summit Racing Part Number:CRN-168771

UPC: 021174045079
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,600-6,200
Intake Duration at 050 inch Lift: 240
Exhaust Duration at 050 inch Lift: 248
Duration at 050 inch Lift: 240 int./248 exh.
Advertised Intake Duration: 302
Advertised Exhaust Duration: 310
Advertised Duration: 302 int./310 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.621 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.632 in.
Valve Lift with Factory Rocker Arm Ratio: 0.621 int./0.632 exh.
Lobe Separation (degrees): 114
Computer-Controlled Compatible: No
Grind Number: HR-240/365-2S-14 IG
Valve Springs Required: Yes
Quantity: Sold individually.
Notes: Camshaft incorporates an integral cast iron distributor drive gear. An aluminum-bronze distributor drive gear not required. 10.5 to 12.5 compression ratio advised. Also fits 502 c.i.d. engines.
Always wanted to try that cam but think it might be a tad small on 540 plus builds depending on what end result expectations are. I was going to use them in my 496's. What about the crane 791 cam other than compression requirements. Lift and duration looks good on a larger CI build.
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Old 10-01-2016, 05:09 PM
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Originally Posted by getrdunn
Always wanted to try that cam but think it might be a tad small on 540 plus builds depending on what end result expectations are. I was going to use them in my 496's. What about the crane 791 cam other than compression requirements. Lift and duration looks good on a larger CI build.
I went 12° and more lift(.650's range) more on both in and ex w/ ls112 on a couple of 540's.both single screws.then ran up nice to 6000+,,idled really well too w/ doms.all off the shelf cam lobe designs.
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Old 10-01-2016, 05:11 PM
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MT listed a couple howards grinds about a dozen pages back that looked about the best I've seen for off the shelf. I noticed howards always list lift depending 1.60, 170, 1.80 rocker ratio. I realize many don't like to use 1.8's however is there anyone has had any real known issues with running them. I can see perhaps a little harder on valvetrain with geometry but... Again anyone here that's had real issues with them?
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Old 10-01-2016, 05:12 PM
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Originally Posted by sutphen 30
I went 12° and more lift(.650's range) more on both in and ex w/ ls112 on a couple of 540's.both single screws.then ran up nice to 6000+,,idled really well too w/ doms.all off the shelf cam lobe designs.
Yeh, 114 doesn't thrillme, but a call can have that changed.

What compression on those?

I'd have to look back somehow and find FF's compression...I think it's close to 9:1.
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