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Flat tappet combos #1349939 12/11/12 11:45 PM 12/11/12 11:45 PM
Joined: Oct 2007 Posts: 3,978 Hilltown Pa 1967dartgt OP master
1967dartgt OP master Joined: Oct 2007 Posts: 3,978 Hilltown Pa	With todays oil, why do people still use these cams? If you want a streetable combo why not a hyd roller?I think you can make as much if not more with a hyd roller. Brett Miller W9 cnc'd heads STR Chassis fabraction

Re: Flat tappet combos [Re: 1967dartgt] #1349940 12/11/12 11:56 PM 12/11/12 11:56 PM
Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY B bobs66440 top fuel
bobs66440 top fuel B Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY	Hydraulic or solid rollers have their own dangers. If you do a search you will find a growing number of posts and complaints about rollers disintegrating and releasing tiny needle bearings free to take the scenic route through your engine. There's nothing wrong with a flat tappet setup as long as it's broken in properly using the proper oils/additives. And it's a good idea to run a zinc additive after break-in with every oil change.

Re: Flat tappet combos [Re: bobs66440] #1349941 12/12/12 12:00 AM 12/12/12 12:00 AM
Joined: Oct 2007 Posts: 3,978 Hilltown Pa 1967dartgt OP master
1967dartgt OP master Joined: Oct 2007 Posts: 3,978 Hilltown Pa	Quote: Hydraulic or solid rollers have their own dangers. If you do a search you will find a growing number of posts and complaints about rollers disintegrating and releasing tiny needle bearings free to take the scenic route through your engine. There's nothing wrong with a flat tappet setup as long as it's broken in properly using the proper oils/additives. And it's a good idea to run a zinc additive after break-in with every oil change. Factory cars go 100,000 mi plus with no problems with hyd rollers. I have never heard of a hyd roller failing, solid yes but a hyd roller no. Brett Miller W9 cnc'd heads STR Chassis fabraction

Re: Flat tappet combos [Re: 1967dartgt] #1349942 12/12/12 12:04 AM 12/12/12 12:04 AM
Joined: Jun 2010 Posts: 3,112 LONG ISLAND fishy340 master
fishy340 master Joined: Jun 2010 Posts: 3,112 LONG ISLAND	There getting real popular these days.

Re: Flat tappet combos [Re: 1967dartgt] #1349943 12/12/12 12:36 AM 12/12/12 12:36 AM
Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY B bobs66440 top fuel
bobs66440 top fuel B Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY	Quote: Quote: Hydraulic or solid rollers have their own dangers. If you do a search you will find a growing number of posts and complaints about rollers disintegrating and releasing tiny needle bearings free to take the scenic route through your engine. There's nothing wrong with a flat tappet setup as long as it's broken in properly using the proper oils/additives. And it's a good idea to run a zinc additive after break-in with every oil change. Factory cars go 100,000 mi plus with no problems with hyd rollers. I have never heard of a hyd roller failing, solid yes but a hyd roller no. You are correct. The hydraulic rollers are much more reliable than the solids.

Re: Flat tappet combos [Re: bobs66440] #1349944 12/12/12 03:46 AM 12/12/12 03:46 AM
Joined: May 2009 Posts: 511 Temperance, MI 6 68 HEMI GTS mopar
68 HEMI GTS mopar 6 Joined: May 2009 Posts: 511 Temperance, MI	i am unimpressed with the hyd roller i put in my 440. since then I've been searching for dyno #'s on Big block mopars with hyd rollers on the net. looks like they all start to give up around that 5800 mark give or take a few hundred rpm. that's about where mine fizzles. it runs like a bear up till that point. a set of beehive's might help it but im pretty disillusioned. it'll twist higher but its just not there. i think they're perfectly fine for some one who just want to cruise their car around. or even a low rpm stroker. i hate to give up on mine because it wasn't a cheap proposition, but it will probably be coming out this winter for a solid.. unfortunately it wont be a easy swap with my home made valley tray... got a .557 cam brand new in the box, thinking that might give it the kick im looking for. 68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780# 69 Roadrunner 511 six pack 10.92 drive to track street car

Re: Flat tappet combos [Re: 68 HEMI GTS] #1349945 12/12/12 04:17 AM 12/12/12 04:17 AM
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	One thing to remember is most stock factory cars with hyd rollers are not raced and they dont worry about valve float and lifters breaking. At least not like our hot rods. I wanted a solid cam in my 63 which is a 99% street car but I did not want to run the spring pressure I should run with a solid roller so I would not have to worry about valve float and roller lifter wear. So I went with a solid flat tappet and run much less spring press then a roller. I do know many do run solid rollers on the street and some have had lifters break and cause eng damage and some have not. I figured if I ran a roller I would want to inspect my lifters every 3000 miles or so. So I just bought a solid cam from Dwayne Porter that he Nitrided and I use the zinc additive and the Valvoline racing oil which has alot of zinc. I have had no problems at all. In fact I have never had a cam lobe wipe on me. I am not knocking rollers as I know I could make more power with one and if my car was race only I would use a roller. I just did not want the worry about the lifters coming apart in time. Ron

Re: Flat tappet combos [Re: 68 HEMI GTS] #1349946 12/13/12 04:25 PM 12/13/12 04:25 PM
Joined: Nov 2005 Posts: 808 mckinney texas S shoebox super stock
shoebox super stock S Joined: Nov 2005 Posts: 808 mckinney texas	Quote: i am unimpressed with the hyd roller i put in my 440. since then I've been searching for dyno #'s on Big block mopars with hyd rollers on the net. looks like they all start to give up around that 5800 mark give or take a few hundred rpm. that's about where mine fizzles. it runs like a bear up till that point. a set of beehive's might help it but im pretty disillusioned. it'll twist higher but its just not there. i think they're perfectly fine for some one who just want to cruise their car around. or even a low rpm stroker. i hate to give up on mine because it wasn't a cheap proposition, but it will probably be coming out this winter for a solid.. unfortunately it wont be a easy swap with my home made valley tray... got a .557 cam brand new in the box, thinking that might give it the kick im looking for. What are those blue rockers? 74 dart sport 440 www.Csucarbs.com

Re: Flat tappet combos [Re: shoebox] #1349947 12/13/12 04:49 PM 12/13/12 04:49 PM
Joined: May 2009 Posts: 511 Temperance, MI 6 68 HEMI GTS mopar
68 HEMI GTS mopar 6 Joined: May 2009 Posts: 511 Temperance, MI	Quote: Quote: What are those blue rockers? indys 68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780# 69 Roadrunner 511 six pack 10.92 drive to track street car

Re: Flat tappet combos [Re: 1967dartgt] #1349948 12/13/12 04:56 PM 12/13/12 04:56 PM
Joined: Feb 2005 Posts: 20,169 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,169 PA.	Quote: With todays oil, why do people still use these cams? If you want a streetable combo why not a hyd roller?I think you can make as much if not more with a hyd roller. 35+ years of using solid lifter cams and never hurt one yet so why change. The biggest one being a 695 lift mushroom tappet. I have hurt a couple of roller cams in the past 20+ years. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: Flat tappet combos [Re: pittsburghracer] #1349949 12/13/12 07:36 PM 12/13/12 07:36 PM
Joined: Apr 2009 Posts: 3,415 Toronto M mshred master
mshred master M Joined: Apr 2009 Posts: 3,415 Toronto	I ran hydraulic rollers in two engines now in my scamp...Both made great power where it was SAFE, but were very RPM limited, and after two dropped valves at both 6200 and 6500 rpms, I refuse to ever use another hydraulic anything in any of my motors. Considering how much money it is to retrofit a hydraulic roller into most small blocks and big blocks, you are better off going solid roller...or just stay flat tappet...Im going solid flat tappet, and my LA is a factory roller block! Im just tired of dealing with the b.s. that hydraulics give with rpm

Re: Flat tappet combos [Re: mshred] #1349950 12/14/12 01:28 AM 12/14/12 01:28 AM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 master
StealthWedge67 master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	Most everything I've read suggests that a solid flat tappet will outperform a hydraulic roller. I still believe that if your goal is a street/strip motor that will make good power, be trouble free and and live for years; an aggressive solid flat tappet makes a very strong argument. Last edited by StealthWedge67; 12/17/12 03:18 AM. LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: Flat tappet combos [Re: StealthWedge67] #1349951 12/14/12 06:40 AM 12/14/12 06:40 AM
Joined: Oct 2003 Posts: 614 ont,canada M mopartuner mopar
mopartuner mopar M Joined: Oct 2003 Posts: 614 ont,canada	Quote: Most everything I've read suggests that a solid flat tappet will outperform a hydraulic roller. I still believe that if your goal is a street/strip motor that will be make good power, be trouble free and and live for years; an aggressive solid flat tappet makes a very strong argument. 410 pump gas solis flat tappet cam 10.95 so far

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