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pros and cons of solid flat tappet vs solid roller #2061947
04/26/16 11:12 AM
04/26/16 11:12 AM
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Mt Morris Michigan
mopar dave Offline OP
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I had my mind set on the hughes solid flat 268/272@50-.650 cam for my new 511 build, which will look something like this. 511,victor heads cnc'd by hughes flow 359@.600 and up, 332 port window, 11.5:1, 3350# weight, 8" vert, 727, 28" tire, currently a 4.30 but i have a 4.10 i can throw back in. This will use a 1100 dom as well.
Now i'm also looking at a solid roller of 276/281@50-.680/.660 on 108.
Performance wise what are the pros and cons of these two cams in this 511? Hughes used to advertise there solid flat cams as equal performance to a solid roller if using a 1.6 rocker arm on their solid flat cams. Not sure i can believe that, but i'm just looking for some input on this subject. This combo will be a street/strip deal or a street car i can race. Might see the track once per season. I guess what i'm asking is would this be a good pick if i go roller? Thanks

Last edited by mopar dave; 04/26/16 11:13 AM.
Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2061969
04/26/16 11:52 AM
04/26/16 11:52 AM
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Huntsville, AL
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Airwoofer Offline
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The Lunati 3 bolt drag race 901 cam is pretty close to what you are looking for. I just had them grind me one on a 114* LSA at 48* for my 500", short stroke KB/B1 low deck 11-1 street motor. It has 1.7 rockers.

http://www.lunatipower.com/Product.aspx?id=1556&gid=370

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2061984
04/26/16 12:20 PM
04/26/16 12:20 PM
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Can't see that a flat tappet has any Pros over a roller these days

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2061986
04/26/16 12:28 PM
04/26/16 12:28 PM
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The only pro a solid flat tappet would have is cost. But you would be giving up reliability and HP.


Brett Miller W9 cnc'd heads
STR Chassis fabraction
Re: pros and cons of solid flat tappet vs solid roller [Re: Monte_Smith] #2061988
04/26/16 12:29 PM
04/26/16 12:29 PM
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Mt Morris Michigan
mopar dave Offline OP
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Didn't think so, but thought i would put that out there. Lobe sep on a 511, does it need to be tight like 108 or would 110 be a better n/a street/strip combo being you have mega low torque anyway?

Re: pros and cons of solid flat tappet vs solid roller [Re: Airwoofer] #2061995
04/26/16 12:38 PM
04/26/16 12:38 PM
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Mt Morris Michigan
mopar dave Offline OP
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I would say the 912 is closer.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062025
04/26/16 01:48 PM
04/26/16 01:48 PM
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I also wanted a 912 but the other cam that fit my 48* motor had been sold, so I didn't have 2 cores for them to grind on. With my 1.7 rockers a 912 would also have been harder on the valve train hardware. I don't like regrinding cams but cores are getting very hard to find unless you want to buy a billet.

But back to your question, I vote for the roller over the flat tappet. Less risk of wiping a lobe, less oil requirements. But there are a lot smarter guys here than me on this subject.

I may spray this motor again with just the fogger so I kept the 114*.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062032
04/26/16 02:02 PM
04/26/16 02:02 PM
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Dave I went with a solid roller in my small block this time. My last two have been flat's, the 408 had a flat solid and the 340 had a flat hydraulic. Both engines were ran with diesel oil and were ran for 5-6 years. Not a ton of passes or street miles on either, but in both engines the cams were starting to go. Both cams had worn lobes with porosity on the nose of the lobes that would catch your finger nail and the lifters from those bores showed more wear than the others. Both were Hughes, not throwing rocks, I like Dave and he has always been very helpful to me. I attribute the wear to the oil, maybe they would've survived with something like Brad Penn.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062042
04/26/16 02:08 PM
04/26/16 02:08 PM
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Unless one is using composite or tool steel lifters the pitfalls still remain. I run over #500 open on a solid cam some cores wear some dont and ive a couple billet cams with solid lobes.

Just different pitfalls with a roller with tips.

Some solids are not that far behind.

But its fun picking off other brands with a solid because for some reason people mention solid roller and some think super fast race car, kind like the old "3/4 cam in my 350 chevy"

But if all my stuff didnt match and interchange as it does now id of used a roller, have in the past and its sorta a different feel.

Last edited by Porter67; 04/26/16 02:09 PM.
Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062058
04/26/16 02:37 PM
04/26/16 02:37 PM
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Mt Morris Michigan
mopar dave Offline OP
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ok, so does the size of the roller i listed look to be inline with what i would need for my 511 combo?

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062065
04/26/16 02:49 PM
04/26/16 02:49 PM
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Take a careful look at a solid roller cam ground with between 260 and 265 @.050 on the intake lobes with as much lobe lift you can get and from 264 to 270 @.050 on the exhaust ground on a 108 LSA installed from 104 to 106 on the intake lobe centers. Buy the roller lifters with the .820 or larger wheels also. I had a very similar solid roller custom ground Comp Cams that I ran a set of the Mopar brand solid roller lifters with the .750 wheels at first (two of the wheels ended up breaking in half down whiney) with a set of Harland Sharp 1.6 ratio rockers and them switched to a set of solid rollers with the larger .820 wheels and never had another lifter problem. The larger wheels make the cam appear bigger to the motor due to opening the valves faster and with more lift in relation to the crankshaft work shruggy That motor ran faster with the bigger wheels in the lifters with no other changes shockwork shruggy

Last edited by Cab_Burge; 04/26/16 02:50 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062130
04/26/16 04:23 PM
04/26/16 04:23 PM
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Originally Posted By mopar dave
I had my mind set on the hughes solid flat 268/272@50-.650 cam for my new 511 build, which will look something like this. 511,victor heads cnc'd by hughes flow 359@.600 and up, 332 port window, 11.5:1, 3350# weight, 8" vert, 727, 28" tire, currently a 4.30 but i have a 4.10 i can throw back in. This will use a 1100 dom as well.
Now i'm also looking at a solid roller of 276/281@50-.680/.660 on 108.
Performance wise what are the pros and cons of these two cams in this 511? Hughes used to advertise there solid flat cams as equal performance to a solid roller if using a 1.6 rocker arm on their solid flat cams. Not sure i can believe that, but i'm just looking for some input on this subject. This combo will be a street/strip deal or a street car i can race. Might see the track once per season. I guess what i'm asking is would this be a good pick if i go roller? Thanks


I like that roller myself.............. wink


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: pros and cons of solid flat tappet vs solid roller [Re: Cab_Burge] #2062144
04/26/16 05:07 PM
04/26/16 05:07 PM
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That roller is to big for what you want IMO.Id go with a roller closer to what Cab suggests, around 265 @ .050 and as much lift say 650 or so. You really Don't need to go as big as you would with a flat tappet to get great performance. 512,s with around 12.5 comp and a 265 @.050 650 lift can make around 750 HP or so.

For a car like yours that will see the track about Once a year, the above cam would be ideal IMO Negative on the 276/280.

Re: pros and cons of solid flat tappet vs solid roller [Re: Sport440] #2062147
04/26/16 05:13 PM
04/26/16 05:13 PM
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That roller is in my baby 470 and drive the snot out of it.........NOT too big at all.............


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: pros and cons of solid flat tappet vs solid roller [Re: Sport440] #2062265
04/26/16 08:22 PM
04/26/16 08:22 PM
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Mt Morris Michigan
mopar dave Offline OP
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My original thought of the 276 cam was lower cylinder pressure to run pump gas on 11.5 comp. And still have good performance and a nice sounnd as well. Your saying 265 for max performance. I understand. I want something easy on springs as well.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062283
04/26/16 08:36 PM
04/26/16 08:36 PM
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W. Kentucky
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Call Dwayne Porter.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062290
04/26/16 08:42 PM
04/26/16 08:42 PM
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The main reason I went with a solid flat tappet on my car is that since its a street car and see's alot of miles I did not want to pull my roller lifters every few years and have them rebuilt because I would have wanted a solid roller with a good bit of spring pressure. So I went solid flat tappet and broke it in right as its been in the eng since 2011 with no problems. I just did not want to worry about my roller lifters since I know I would want to check them every few years at least. If mine was a race car I would have went roller for sure. Ron

Last edited by 383man; 04/26/16 08:42 PM.
Re: pros and cons of solid flat tappet vs solid roller [Re: 383man] #2062317
04/26/16 09:27 PM
04/26/16 09:27 PM
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Mt Morris Michigan
mopar dave Offline OP
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i agree and was my thinking with the flat tappet as well. Just a pain at break in.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062320
04/26/16 09:34 PM
04/26/16 09:34 PM
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IMO, "mostly street" tips it in the flat tappet direction. You will give up a small amount of HP for a lot less $, less valve train wear ( in particular springs ), and less moving parts to fail. Street is all about longevity, and when you are talking about lifts and durations that you are, light is right on the street. Hughes comments on flat vs roller cams was mostly based on the larger .904 lifter that Chrysler uses - which Hughes claims their cams are based on ( "real Chrysler cams")vs other cam manufactures.


Fastest 300
Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062325
04/26/16 09:37 PM
04/26/16 09:37 PM
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Lee446 Offline
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The fact that you will be driving on the street over 90% of the time tells me that a solid F/T would be the way to go. My understanding is that solid rollers don't care too much for idleing in traffic due to lubrication issues. A Porter custom solid with nitride F/T cam and EDM lifters would make for a great performing, long lived street combo.

Last edited by Lee446; 04/26/16 09:38 PM.
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