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<blockquote data-quote="swampratt" data-source="post: 2923462" data-attributes="member: 15054"><p>Roller cams suck to say the least.</p><p>Yea I know many people run them..I also know many people have failed lifters and cams. both roller and flat tappet.</p><p>But I see many more roller cams in the cam shop that have failed with very low miles on them.</p><p></p><p>And this cam was my sort of invention with the 601 heads I run.</p><p>It is a proven circle track grind from crane started life as a dual pattern the .518" -.536" lift ,, it is their F3 Lobe</p><p>this one.</p><p><a href="https://www.summitracing.com/parts/crn-110921" target="_blank">https://www.summitracing.com/parts/crn-110921</a></p><p></p><p>My choice of factory iron heads even ported need much help on the intake side.</p><p>So I had the cam grinder guy grind the cam as a single pattern using the ex lobe master 252 duration @ .050-.536" lift.</p><p></p><p>I had him make me 3 of them I used one in a 355" with cast dished pistons and 601 heads with 1.94-1.50 valves and a .015" gasket.</p><p>It went mid 11's with 4.11 gears and 3500 stall summit racing converter..Hurricane intake and 800 double pumper.. it was in a 1976 stepside chevy lightened to 3000 lbs without driver.. early shifting at 7,000 rpm.</p><p>I thought for sure the low end would suffer but it did not , it had 11.5" vacuum at idle enough for power brakes.</p><p></p><p>Revved like a KZ 1000.</p><p>I have been in many cars with roller cams and only a couple would impress me.</p><p>The 270 magnum XE comp grind does not impress me.</p><p>The thing actually gave many troubles with the supplied comp lifters... replaced 3 sets of lifters as they just quit after a couple hundred miles..</p><p>Would not hold pressure..New build everything was spotless. It was a 327 with 180 afr competition heads. That roller experience leaves a bad taste in your mouth over $1000 extra for much more headaches and the power was not any better than the XE268H flat tappet with 492 heads I ported on the same 327 short block. sad indeed.</p><p>I do not really even like that 268XE either it was lacking vs a 280 magnum and even the 270H magnum old school would out pull the XE268</p><p></p><p></p><p>Yea there are other lifters.</p><p>But I have a strong liking for solid flat tappets.. and I run the Howards EDM lifters on them now.</p><p>I ran my Herbert CC4C for 75,000 miles. 2 years to get those miles on it. That is a solid flat tappet It seen 8500 rpm 2 times in a 350</p><p>Normally shifted it at 7600-7800 rpm.</p><p></p><p>I love My rpm.</p><p>If i ever go roller it will be a solid roller With bushed lifters not bearing ones and I want it to rev.</p><p></p><p>Here is a small camold school comp grind 268H in a 350" in the truck 3.25 gears 29.5" tall tires TH 350 and low stall converter.</p><p>The cam is hydraulic flat tappet ground on a 106LSA,, added overlap helps the upper rpm.</p><p></p><p>Here is the video with the 268H My first video.. crappy i know.</p><p>The engine will easily rev to 7000 with that little cam.</p><p>I ran 4.56 gears and a coan 4500 stall with the same 268 on a 106LSA and it hit 7400 rpm before i knew what happened.SHIFT!! I set it up like that for the Elreno cruise</p><p>[MEDIA=youtube]hivG7qlPTZA[/MEDIA]</p><p><img src="https://www.youtube.com/watch?v=hivG7qlPTZA" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="swampratt, post: 2923462, member: 15054"] Roller cams suck to say the least. Yea I know many people run them..I also know many people have failed lifters and cams. both roller and flat tappet. But I see many more roller cams in the cam shop that have failed with very low miles on them. And this cam was my sort of invention with the 601 heads I run. It is a proven circle track grind from crane started life as a dual pattern the .518" -.536" lift ,, it is their F3 Lobe this one. [URL]https://www.summitracing.com/parts/crn-110921[/URL] My choice of factory iron heads even ported need much help on the intake side. So I had the cam grinder guy grind the cam as a single pattern using the ex lobe master 252 duration @ .050-.536" lift. I had him make me 3 of them I used one in a 355" with cast dished pistons and 601 heads with 1.94-1.50 valves and a .015" gasket. It went mid 11's with 4.11 gears and 3500 stall summit racing converter..Hurricane intake and 800 double pumper.. it was in a 1976 stepside chevy lightened to 3000 lbs without driver.. early shifting at 7,000 rpm. I thought for sure the low end would suffer but it did not , it had 11.5" vacuum at idle enough for power brakes. Revved like a KZ 1000. I have been in many cars with roller cams and only a couple would impress me. The 270 magnum XE comp grind does not impress me. The thing actually gave many troubles with the supplied comp lifters... replaced 3 sets of lifters as they just quit after a couple hundred miles.. Would not hold pressure..New build everything was spotless. It was a 327 with 180 afr competition heads. That roller experience leaves a bad taste in your mouth over $1000 extra for much more headaches and the power was not any better than the XE268H flat tappet with 492 heads I ported on the same 327 short block. sad indeed. I do not really even like that 268XE either it was lacking vs a 280 magnum and even the 270H magnum old school would out pull the XE268 Yea there are other lifters. But I have a strong liking for solid flat tappets.. and I run the Howards EDM lifters on them now. I ran my Herbert CC4C for 75,000 miles. 2 years to get those miles on it. That is a solid flat tappet It seen 8500 rpm 2 times in a 350 Normally shifted it at 7600-7800 rpm. I love My rpm. If i ever go roller it will be a solid roller With bushed lifters not bearing ones and I want it to rev. Here is a small camold school comp grind 268H in a 350" in the truck 3.25 gears 29.5" tall tires TH 350 and low stall converter. The cam is hydraulic flat tappet ground on a 106LSA,, added overlap helps the upper rpm. Here is the video with the 268H My first video.. crappy i know. The engine will easily rev to 7000 with that little cam. I ran 4.56 gears and a coan 4500 stall with the same 268 on a 106LSA and it hit 7400 rpm before i knew what happened.SHIFT!! I set it up like that for the Elreno cruise [MEDIA=youtube]hivG7qlPTZA[/MEDIA] [IMG]https://www.youtube.com/watch?v=hivG7qlPTZA[/IMG] [/QUOTE]
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