roller 302 and cam selection

steel1212 · Jun 11, 2005

I was just sitting here thinking about my next engine lol and started cruising ebay and there is a guy locally that has one posted for dirty cheap. Anyway I was looking at my cam choices. I know I love my magnum hydraulic 280H would I look for the same duration if I went to roller even though the lift is a lot more? Or would I try to match my lift with what I have now with less duration?

65ShelbyClone · Jun 11, 2005

Dont shop for a cam based on how close it is to a grind you like; look for one that best matches your engine(I'm sure you know already). Depending on your piston to valve clearance, you may be able to get something with more duration and the same lift since rollers get the valve open and closed faster. In contrast, you may be able to use more lift on the same duration for the same reason.

There are alot of options for 5.0s. FMS E, B, F, and X cams, my Crane is similar to the 280, but its lower on duration while being higher in lift(.512/214* intake, .529/220* exhaust, I had interference on both). I dont know what Crower has, but I'm sure they have a selection.

Stang89LXCPE · Jun 11, 2005

Roller cams can run much more lift and duration because of the fast ramps. if you physically look at a roller cam, you can see how the lobe comes to a "point" compared to the flat tappet. The old school flat tappet cams can't compete with the rollers because they (flat tappets) can't follow the agresive ramps. If you like the 280 comp (230/230 .512 lift)

I'd go with something bigger like a comp XE274HR-12, with 274/282, Lift .555/.565,

or the XE282HR-12 with 282/290, Lift .565/.574.

It will be hard to find a straight pattern cam as most of the are biased towards the exhaust, which is a good thing with SBF heads. All of the Motorsport cams are a straight pattern, but these two comps will be better for you than the motorsport cams

washMO66 · Jun 11, 2005

I like my comp XE274HR, (specs above) with my stroker. But if you like a little more RPM I would consider the XE284. If I keep my current engine I will be doing a cam swap when I get it freshened up.

steel1212 · Jun 11, 2005

If I start on a roller engine I'm going to go ground up and do it the way I should have done the one I have. Valve relieved pistons for afr 185s with about 10.5 compression or so. Roller cam, lifters, and rockers of course.

I've only dealt with flat tappets so I don't know what I would want with a roller. I basically want one that is in the same "streetable" catagory as the 280H but more performance out of it.

washMO66 · Jun 12, 2005

steel1212 said:
If I start on a roller engine I'm going to go ground up and do it the way I should have done the one I have. Valve relieved pistons for afr 185s with about 10.5 compression or so. Roller cam, lifters, and rockers of course.

I've only dealt with flat tappets so I don't know what I would want with a roller. I basically want one that is in the same "streetable" catagory as the 280H but more performance out of it.

You have to ask. What are you goals for this engine build? Will it be at the track? How often? How much street driving? Are street manners important to you........ etc

Play the devils advocate before you buid something or you won't be pleased with it. Without making modifications to your drivetrain and chassis, the car will be way off.

I think 350HP with a 5 speed in a 65 - 66 is a perfect combo and will provide lots of fun with less risk of breakage.

And if that don't work, 500 to 600 HP small blocks are entertaining as well.

steel1212 · Jun 12, 2005

My goal is mid 12s at the track, but very streetable. I don't want a car it takes me an hour to start or keeps dieing at stop lights I mean 500 hp would be fun but I think a 300 rwhp car would be just what I need. More would be great but like I said the whole reason to get the roller setup is for me to get more hp than what I have with out losing streetablitly.

Stang89LXCPE · Jun 12, 2005

I had a stipped 84 notch (no options) that weighed 3050 with me in it. It had a 93 H.O. motor, Motorsport B303 cam with 1,7 rockers, shorty headers, 650 dp, stealth intake, with a T-5, and 3.73's. It went 12.70's @ 105 launching it at 5K on worn out slicks.

steel1212 · Jun 12, 2005

See I would love to do that. To me 12s one a very streetable car is all I need. I mean if I can push it lower and still be streetable then I'm game. I just don't want one of those cars that people call street cars when they just, "drive it around the block" I want to be able to drive it to the track 2 hours away hit 12s drive it back and cruise all night.

We are kind of getting off topic though. is the XE274HR-12, with 274/282, Lift .555/.565 at 0.050? If so that seems ALOT bigger than what I have now for duration. I mean if its a roller cam and I can get away with it then I'm cool with that

1967stang302 · Jun 15, 2005

I would also say that you should be weary at buying an engine off of ebay, I bought two and it was really bad. The first one, kept my money for almost 3 months without answering my phone calls or delivering anything. The second one took 3 months to deliver too and he was only an hour drive away. That one had untapped bolt holes, rusted through bolt holes, I could go on, lets just say the judge told him he was an idiot to sell that as a drop in and go engine. as for the cam, I wouldn't know, listen to one of these smart guys above me.

washMO66 · Jun 15, 2005

1967stang302 said:
I would also say that you should be weary at buying an engine off of ebay, I bought two and it was really bad. The first one, kept my money for almost 3 months without answering my phone calls or delivering anything. The second one took 3 months to deliver too and he was only an hour drive away. That one had untapped bolt holes, rusted through bolt holes, I could go on, lets just say the judge told him he was an idiot to sell that as a drop in and go engine. as for the cam, I wouldn't know, listen to one of these smart guys above me.

Agreed, watch your arse on eBay, lots of crooks. But, lots of honest builders selling some good stuff.

Got this one on eBay, but after lots and lots of questions & research. Best engine I have ever had. I got lucky.

Stang89LXCPE · Jun 15, 2005

steel1212 said:
is the XE274HR-12, with 274/282, Lift .555/.565 at 0.050?

no that is the advertised. here is the link for the specs from Comp. It is 224/232 at .050

comp cam XE274HR-12

ashford · Jun 15, 2005

i have a e303 in my capri which is a 280\280 grind with .498 lift c6oe heads and was my only car for about a year. other than the wear on the gas gague i didn't mind driving it

D.Hearne · Jun 16, 2005

Stang89LXCPE said:
Roller cams can run much more lift and duration because of the fast ramps. if you physically look at a roller cam, you can see how the lobe comes to a "point" compared to the flat tappet.

You've got that backwards. It's easy to id a flat tappet cam next to a roller, because of the flat tappet's lobes are more "pointed".

D.Hearne · Jun 16, 2005

steel1212 said:
I was just sitting here thinking about my next engine lol and started cruising ebay and there is a guy locally that has one posted for dirty cheap. Anyway I was looking at my cam choices. I know I love my magnum hydraulic 280H would I look for the same duration if I went to roller even though the lift is a lot more? Or would I try to match my lift with what I have now with less duration?

A Ford B303 with 1.7 rockers or an F303 is about as close to the 280H as you'll find. Both are very streetable. I've run the B303 with 1.7 rockers in a 302 with ported E7 heads, a dual plane intake and a Holley 650 DP carb. I also ran it later in the same short block with Canfield heads, a Vic Jr. and the same Holley carb. It wasn't nearly as streetable as it was with the E7's and the dual plane.

steel1212 · Jun 16, 2005

Whats the diffrence between the magnums and the xtreme energy cams? I was looking at the magnums and they have one at 230 duration a 0.050 but .598 lift!!! Would that be way to much lift on a street car? The xtreme also has the 282hr which is 232/240 with 565/574 lift.

D.Hearne · Jun 16, 2005

The Extreme Energy cams have faster ramps. The only disadvantage to more lift, is the stress it puts on the springs. That 286HR is a bit more cam than you'd want on the street in a 302. Comp's instructions for it include: 5 speed trans with 4.10 or lower gears, lots of compression, aftermarket intake, exhaust and a big stall converter ( if using it with an automatic)

D.Hearne · Jun 16, 2005

I'm running a Ford Z303 in my 331, but even though I've increased the lift with 1.7 rockers, the extra cubes and the dual plane intake ( Ford 3x2) have tamed it for the street. It idles at 6-700 rpms with the 4 speed.

steel1212 · Jun 16, 2005

D.Hearne said:
The Extreme Energy cams have faster ramps. The only disadvantage to more lift, is the stress it puts on the springs. That 286HR is a bit more cam than you'd want on the street in a 302. Comp's instructions for it include: 5 speed trans with 4.10 or lower gears, lots of compression, aftermarket intake, exhaust and a big stall converter ( if using it with an automatic)

I've got all that

I mean I want to build a roller engine with the below accessories plus afr 185s and run 12s. Which came would be best the 274?

washMO66 · Jun 16, 2005

steel1212 said:
I've got all that

I mean I want to build a roller engine with the below accessories plus afr 185s and run 12s. Which came would be best the 274?

I have no complaints with the XE274HR and the manners are fine on the street. I has a real nice lope to it as well. It will make power up to 6200RPM which is ideal for the street.

I have the AFR185's as well and it is a damn good head. I have some work done to mine (port polish) which helps, but I hear they are good right out of the box.

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