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pros and cons of solid flat tappet vs solid roller #2061947 04/26/16 12:12 PM 04/26/16 12:12 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	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 12:13 PM. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2061969 04/26/16 12:52 PM 04/26/16 12:52 PM
Joined: Feb 2014 Posts: 655 Huntsville, AL A Airwoofer mopar
Airwoofer mopar A Joined: Feb 2014 Posts: 655 Huntsville, AL	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 01:20 PM 04/26/16 01:20 PM
Joined: Nov 2004 Posts: 6,890 North Alabama M Monte_Smith master
Monte_Smith master M Joined: Nov 2004 Posts: 6,890 North Alabama	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 01:28 PM 04/26/16 01:28 PM
Joined: Oct 2007 Posts: 3,978 Hilltown Pa 1967dartgt master
1967dartgt master Joined: Oct 2007 Posts: 3,978 Hilltown Pa	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 01:29 PM 04/26/16 01:29 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	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? http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: pros and cons of solid flat tappet vs solid roller [Re: Airwoofer] #2061995 04/26/16 01:38 PM 04/26/16 01:38 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	I would say the 912 is closer. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062025 04/26/16 02:48 PM 04/26/16 02:48 PM
Joined: Feb 2014 Posts: 655 Huntsville, AL A Airwoofer mopar
Airwoofer mopar A Joined: Feb 2014 Posts: 655 Huntsville, AL	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 03:02 PM 04/26/16 03:02 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	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 03:08 PM 04/26/16 03:08 PM
Joined: Jun 2014 Posts: 5,183 P Porter67 master
Porter67 master P Joined: Jun 2014 Posts: 5,183	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 03:09 PM.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062058 04/26/16 03:37 PM 04/26/16 03:37 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	ok, so does the size of the roller i listed look to be inline with what i would need for my 511 combo? http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062065 04/26/16 03:49 PM 04/26/16 03:49 PM
Joined: Aug 2003 Posts: 43,112 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,112 Bend,OR USA	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 ) 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 That motor ran faster with the bigger wheels in the lifters with no other changes Last edited by Cab_Burge; 04/26/16 03:50 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 05:23 PM 04/26/16 05:23 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	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.............. 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 06:07 PM 04/26/16 06:07 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	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 06:13 PM 04/26/16 06:13 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	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 09:22 PM 04/26/16 09:22 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	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. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062283 04/26/16 09:36 PM 04/26/16 09:36 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	Call Dwayne Porter.

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062290 04/26/16 09:42 PM 04/26/16 09:42 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	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 09:42 PM.

Re: pros and cons of solid flat tappet vs solid roller [Re: 383man] #2062317 04/26/16 10:27 PM 04/26/16 10:27 PM
Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,031 Mt Morris Michigan	i agree and was my thinking with the flat tappet as well. Just a pain at break in. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: pros and cons of solid flat tappet vs solid roller [Re: mopar dave] #2062320 04/26/16 10:34 PM 04/26/16 10:34 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	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 10:37 PM 04/26/16 10:37 PM
Joined: Jan 2003 Posts: 1,374 Houston,Tx. L Lee446 pro stock
Lee446 pro stock L Joined: Jan 2003 Posts: 1,374 Houston,Tx.	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 10:38 PM.

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