Duration in roller vs flat tappet.

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Jun 21, 2008 | 09:26 AM

JBradley500

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Duration in roller vs flat tappet.

im getting the urge to tell my engine guy to put at roller cam in my engine. i was going to be using a xe262h....what would be the equivilant to this cam in a roller, meaning in driveability? id like to make some more HP, so something bigger in a roller version would be nice if i could keep the same low end torque as a hyd. flat tappey xe262h but gain some rpms and hp at the same time.

Jun 21, 2008 | 09:36 AM

JBradley500

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also, whats the difference in price in putting in a roller set-up vs replacing the flat tappet cam, lifters, pushrods, guide plates and springs. like 5-600 bucks?

Jun 21, 2008 | 10:39 AM

Winder

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The xe262 is a great cam. I like roller cams because the valves reach full lift faster and stay there longer. It gives you a much wider power band. For a 335 series motor you will want to have a custom ground cam, as the 260HR and 270HR are the only out of the box roller cams (simulare to the xe262) that I am aware of. Nothing wrong with the 260HR or 270HR, but I would only run them if I was going to do some head work to the stock heads or run CHI heads. If you are going to run stock heads or aussie heads then I would have a split duration roller cam ground. It is not really that much more expensive and you get a cam designed for you particular engine.

Jun 21, 2008 | 10:49 AM

JBradley500

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i was hoping there was a larger selection than i saw on the internet.

i was seeing alot of people use those cams as blower cams, well the 270 mainly. i thought i might have been just in the blower cam section. lol, i know the engine guy i go to likes to have cam craft custom grind stuff anyway, so that might make him happy.

Jun 21, 2008 | 11:15 AM

Winder

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I would go with the custom ground cam if you go roller. If a flat tappet cam I would buy off the shelf because there is just about every profile available. I think you will be very happy with the custom ground roller cam.

Jun 21, 2008 | 12:08 PM

JBradley500

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do you know anything about pricing the retro fit system if you were to start from scratch?

Jun 21, 2008 | 12:28 PM

Winder

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For economy I believe you can use the roller lifters from a 302 with the spider and dog bones.

Camshaft Retro Fit Kits - summitracing.com

Ford Racing M-6500-R302 - Ford Racing Hydraulic Roller Lifters - summitracing.com

You will need hardened pushrods and guide plates.

COMP Cams 26120-16 - COMP Cams Valve Springs - summitracing.com (I prefer these springs for roller cam).

And you will want adjustable roller rockers. Scorpion is probably the best value @ around $200.00 a set.

I assume you are going to replace lifters and springs anyway, so figure what you were going to spend on a non-roller cam then look at what the roller cam will cost. Then look at the difference and ask yourself if you think it is worth the difference.