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Has anyone swapped to a roller cam?

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lynchster View Drop Down
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    Posted: 12-May-2015 at 6:01PM
I dropped off a boatload of parts at the machine shop but I haven't settled on a cam just yet. Fortunately the heads will keep him busy for a minute. I'm a little concerned about over camming the engine because of the power brakes and I'm settling on a few milder grinds. 
One is Comp Cams 270HR. The .050 duration is at 215 and lift works out to .576 with the 1.73 rockers. The machinist likes the 50 degrees overlap and believes more duration will adversely affect the vacuum. So I thought I'd see what some of you guys are running and get some opinions before I made a final decision.
 
BTW. A few other points of interest in the equation. 10:1 (ish) compression, 70 4V heads, roller lifters and rockers, headers, probably sticking with a 750cfm carb. 


Edited by lynchster - 12-May-2015 at 6:04PM
Chuck
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Regul8r Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2015 at 6:08PM
I am not a CAM expert on the numbers and all.
 
I do know IF you can go with a roller lifter set up... DO IT!
 
I am working with my shop on doing it on my 351W too.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2015 at 6:13PM
How've you been Carl? The roller cam is basically a done deal. I've already bought a nice looking set of Lunati link bar retro fits.
I'd go with a Lunati Voodoo cam but that .600 lift is skirting the edge without using lifter bore sleeves.    
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2015 at 6:33PM
not sure exactly how a comp cams 270 roller in a Cleveland would be like but i have a comp cams 270 hyd flat tappet cam in my 305 sbc with crane cams high intensity lifters in my 70 chev truck and 1.5 roller rockers no issues with the power brakes or p/s! FWIW
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Regul8r Quote  Post ReplyReply Direct Link To This Post Posted: 13-May-2015 at 11:03AM
Good to see Maj Redmond is coming along.
Good deal with the retro fit rollers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 13-May-2015 at 2:54PM
Originally posted by californiajohnny californiajohnny wrote:

not sure exactly how a comp cams 270 roller in a Cleveland would be like but i have a comp cams 270 hyd flat tappet cam in my 305 sbc with crane cams high intensity lifters in my 70 chev truck and 1.5 roller rockers no issues with the power brakes or p/s! FWIW
 
If figure it to be a safe cam for vacuum. I'm more or less trying to find out where that line is to walk up to it and not cross over.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 75GranMan Quote  Post ReplyReply Direct Link To This Post Posted: 13-May-2015 at 3:29PM
Chuck, I have comp cams 290HR in my 351CJ stoker 393. @.050 duration 230 with a lobe separation of 110,Valve lift of .578 . compression ratio is 10.7:1  Although I have issues with my engine build. I can attest this cam provides enough vac to run power brakes.
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Tighten it down until it snaps and then back it off a half turn!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 15-May-2015 at 5:50PM
Originally posted by 75GranMan 75GranMan wrote:

Chuck, I have comp cams 290HR in my 351CJ stoker 393. @.050 duration 230 with a lobe separation of 110,Valve lift of .578 . compression ratio is 10.7:1  Although I have issues with my engine build. I can attest this cam provides enough vac to run power brakes.
 
What happened to your engine?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 75GranMan Quote  Post ReplyReply Direct Link To This Post Posted: 16-May-2015 at 3:00PM
I haven't updated my Progress thread as to what's going on with it. I'll let you all know when it's squared away.
John 75Gran Torino 4spd
Tighten it down until it snaps and then back it off a half turn!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 20-May-2015 at 2:37PM
Has anyone been able to use the reduced base circle Comp Cams with the link bar lifters without a problem?
I'm using the Lunati lifters because I'm told the placement of the oil band plays well with the lifter bore so long as I stay under .600 lift.      
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gnrlee01 Quote  Post ReplyReply Direct Link To This Post Posted: 01-September-2016 at 5:23PM
i have a kit that includes a high volume melling oil pump, a double roller timing set, everything needed for converting over to a complete roller rocker/roller cam set up and new valve springs along with 2 sets of pushrods if anyone is interested...

the kit number is "comp cams k32-421-8"
the actual cam box says 32-421-8 cam specs are int 270 exh 270 dur @ 0.50: 215 215 lobe sep 110.0 valve lift 0.566 0.566
sn# wl3719-15
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 4:45AM
Question when installing roller lifters do you need the some call dog bones and spider cage? If so is the 400 drilled for the spider cags I know my 302 (1974 block) is not
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 6:22AM
IIRC the OEM factory roller set ups are bolted to the blocks (older blocks are probably not drilled and tapped for that) but aftermarket set ups usually have a strap bar looking thing connecting the lifters together so they can work in older blocks (the purpose is to keep the roller lifters from spinning...flat tappet lifters must spin or the cam is wiped out in a few miles...rollers have the roller on the bottom of the lifter so they don't need to spin) 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 6:47AM
Probably only gm. Will call sumit tomorrow and ask.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Bird Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 1:10PM
 Nothing from the 70s will be drilled for spiders. No 335-series engines were produced from the factory with roller cams, so not going to be drilled for the spider. As Johnny said, some aftermarket systems have a work-around.
The above post should be read in a "Grumpy Old Man" voice.
Almost forgot: "Get off my lawn!!!"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 1:49PM
I didn't use the spider retainer set up. Those are generally used in the late model 5.0 roller lifters up but the oil bands are generally too high for the Cleveland lifter bores, especially with the beveled top edge of the bore. They can be used but most of what I read indicated that the lifter bores needed sleeved to do it.
 
I wound up using the Lunati linked roller lifters and went with a standard base circle cam. 


Edited by lynchster - 04-September-2016 at 5:39PM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gnrlee01 Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 4:21PM
as far as i know, yes, you would have to drill and tap to have the retainer installed, and also yes, this kit has the "strap bar looking thing" for retaining purposes. when i bought the kit, i was figuring on drilling and tapping the heads so that i could have the roller set in its full purpose and function. i figured that once installed, having a roller cam and timing set was far more superior than that of the traditional flat tappet stock cam set.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 6:30PM
you won't need to drill and tap if you use the strap bar style!
FORD ROLLER LIFTER RETRO FIT KIT 302 351W with lifters  Comp Cams 8931-2 Pro Magnum Hydraulic Roller Lifters SB-Ford 221-351W
drill and tap: factory style^^^                  aftermarket strap bar link style  ^^^^^
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gnrlee01 Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 6:37PM
oh, well thats cool!! thats what my kit has...than i guess you dont have to drill and tap. i thought i had to drill and tap to use that thing.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 04-September-2016 at 7:27PM
the one on the left you do, the kind on the right you don't, you don't use anything but those lifters
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