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Author
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Topic: what is the difference between the 270H and 270S
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-15-2003 04:48 PM
   
other than the lifters?? does the solid have a faster ramp speed even though the same advertized and at 0.05 numberswith all this talk about cams... what would be the mainanince difference? would the solid not work well with aluminum heads with a wide temp climate. On stock iron heads (for now) would i be able to notice a power difference between the two. Would I need a different converter for the solid [This message has been edited by Dubz (edited 10-15-2003).]
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-15-2003 07:23 PM
Either cam would work with Alum or iron heads. Both cams are about the same that I can see. But the 270s you'd have to adjust the valves a few times a year. Also the S cam would be more adjustable to suit the motor. Either cam would be a mild cam in a 351w. I think thats the cam Todd has in his 333 stroker(sorry I always forget about those other two.  I heard it run and you tell it has a cam in it. I've been tolds that bigger motors can run alittle more to get the same effect as a smaller motor. I think the 280h or 282s are about the best choice for a hot street motor. And they say you can still run a stock converter with it.------------------
SCOOP 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics [This message has been edited by Fastymz (edited 10-15-2003).]
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-15-2003 07:50 PM
cheaper to run either? are there less problems associated with the solid other than the adjustment?is there a solid made for the 351W or would i have to get the 289/302 firing order ones The solid should give me more power, but where?? and is it just from the lighter less complex lifters? [This message has been edited by Dubz (edited 10-15-2003).]
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-15-2003 07:55 PM
Either you should have screw in studs in the heads. But the solid needs harden push rods and adjustable rockers. So it maybe alittle less expensive to run the 270H. I'm no cam guy I'm just learning like you are. I hope someone who knows this stuff better comes along to add there opinion.------------------
SCOOP 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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V8 Thumper
Gearhead Posts: 4638
From: Phoenix, Arizona
Registered: Dec 2001
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posted 10-15-2003 09:27 PM
quote:
Originally posted by Fastymz:
I think thats the cam Todd has in his 331 stroker.
Yep, but soon to go bigger  For the guy who wants snappy performance, it's a great grind. I just put a 270H in my Papa-in-law's 429 powered Galaxie, and it really woke it up. With all those cubic inches to feed, it idles well. The almost identical profile in my little stroker idles 'noticable' but not radical. I get 12hg", so power brakes might be iffy (mine are manual, so it's all good). It's borderline for a stock converter, probably lousy with tall gears and a stock converter. I like three pedals, so I don't care about that stuff  I don't know the exact difference between the two camshafts (solid vs. hydraulic), but solids have no 'give' in the lifter, netting precise lift and duration, and faster valve accelration. With lash, they're 'tuneable', whereas juicers are not. Solids require periodic adjustment vs. zero maintence hydraulics, so a mechanical grind in a daily driver might or might not be to your liking. I'm sure Comp's tech line can answer your question to much greater detail than I can. If you call them, please share. I'm curious to know what they say  ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-15-2003 10:07 PM
did you want to sell the 270S when you upgrade?? It'll be my daily for a while, but i don't mind fiddling with lash (how does the lash change that you would need to re-set it periodicly?)
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V8 Thumper
Gearhead Posts: 4638
From: Phoenix, Arizona
Registered: Dec 2001
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posted 10-16-2003 11:56 AM
quote:
Originally posted by Dubz:
did you want to sell the 270S when you upgrade??
Not sure yet, but Scoop does have first dibbs on it. The first 500-1000 miles while everything is seating in, they can go out of adjustment and require re-setting frequently. Once everything is all seated in, they stay put. I check them every so often, and adjust them at oil changes as well as re-torquing the heads ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html [This message has been edited by V8 Thumper (edited 10-16-2003).]
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-17-2003 01:58 AM
anyone have anything else to add?
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 10-17-2003 10:18 AM
The solid will give better average valve lift action and generate a little more torque and power. If you are considering a solid, go to their website (compcams) and look at their Nostagia Plus mechanical series. It looks like a great modern cam for stock heads with the benefit of tight lash settings. ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-17-2003 12:49 PM
hmm, that's funny, comps site is down for the frist time in a long time  oh well, probably just down for maintinace or something ------------------
1974 Gran Torino, 351W
rpm air gap intake, Holley 670 carb, 1" 4 hole spacer
My Page
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V8 Thumper
Gearhead Posts: 4638
From: Phoenix, Arizona
Registered: Dec 2001
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posted 10-17-2003 02:00 PM
They've been doing some site re-design, it's been on-and-off for a few weeks now. Try it later in the afternoon, it'll probably be all good. You can still call 1-800-CAM-HELP ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-20-2003 05:59 PM
why is it that the H costs more than the S? stronger materials?and what is the pn for the 270S for a 351?
i'm guessing at 35-333-4 since the 289/302 is 31-333-4 would i need the upgraded springs for either? or could i get away with the stock ones for a year? [This message has been edited by Dubz (edited 10-20-2003).]
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V8 Thumper
Gearhead Posts: 4638
From: Phoenix, Arizona
Registered: Dec 2001
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posted 10-20-2003 07:10 PM
If you don't run the recommended springs and there winds up being a problem (likely with under-tensioned springs), Comp will not warranty the camshaft and lifters. $80 for new springs is cheap insurance ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-20-2003 07:37 PM
but would i not also need to machine the heads to be able to use the new springs?
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V8 Thumper
Gearhead Posts: 4638
From: Phoenix, Arizona
Registered: Dec 2001
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posted 10-20-2003 09:37 PM
No machine work necessary for the springs themselves, but adjustable valvetrain is mandatory so if yours are positive-stop then you'll need machine work regardless. Screw-in studs are highly recommended, but not 100% necessary for that cam and recommended springs ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 10-21-2003 12:41 AM
they have a adjustment kit p# 4610-16which i was planning on using until i get new heads
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