Comp 274 cam and phaser - Hemi Truck Club
 
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Old 05-16-2016, 06:04 PM   #1
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Comp 274 cam and phaser

SO has anyone installed them in your trucks or Jeeps, or Durangos? If so what did it dyno at?

I see the challenger R/T made near 450whp, and other forums have about the same or more in the cars, how about the trucks and SUV's?

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Old 05-17-2016, 03:15 AM   #2
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http://www.highhorseperformance.com/category_s/7387.htm

Camshafts
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Old 05-17-2016, 11:50 AM   #3
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There are more cammed 4th gens on Ramforum or Nadodge. Not sure what they are dynoing. But they are showing pretty good results at the track.
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Old 05-17-2016, 02:13 PM   #4
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What's a phaser?
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Old 05-17-2016, 02:22 PM   #5
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The 274 is WAY too big for a 5.7. You wont find much in the way of dyno numbers on the cammed VVT trucks, but the fastest trucks are running cams much smaller than that.
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Old 05-17-2016, 06:31 PM   #6
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What makes it too big? If you have valve springs to handle the higher lift, and added duration why is it too big?

Our stock heads flow a good bit, and make decent power on very mild sticks. You would think, in theory, it would make great power.
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Old 05-17-2016, 06:34 PM   #7
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Originally Posted by RT12_John View Post
What makes it too big? If you have valve springs to handle the higher lift, and added duration why is it too big?

Our stock heads flow a good bit, and make decent power on very mild sticks. You would think, in theory, it would make great power.
It's the rpm range of the cam. You would need no less than 4.56 gears, 4000 stall Tq converter, and 7000rpm shift points to use a cam that size.
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1/8 - 6.54 @ 108.88MPH
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Old 05-17-2016, 08:05 PM   #8
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Originally Posted by mjfikac View Post
It's the rpm range of the cam. You would need no less than 4.56 gears, 4000 stall Tq converter, and 7000rpm shift points to use a cam that size.
I agree. I ran the Comp 268 on my old 5.7L with 4.56 gears and a 2500 stall. It performed well with that setup. I have never heard of someone running the 274 in a truck.
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Old 05-17-2016, 10:29 PM   #9
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Cam is designed for the 6.4 Apache with its 392 cubic inch motor and 70% head IE flow ratio. Even then it is the largest cam offered from Comp for the 6.4

Putting it in a 5.7 is ridiculous regardless of the setup...

Numbers posted from HHP are squewed, or rigged for a better word of it. Low end loss is tremendous and so is the power band.

Stock Hemi truck cam is 195/212 with a 17 degree split for the flow ratio of our heads. You will notice my non high lift cams are 18 degree splits to work well with the 55% flow ratio of the heads. When the heads are ported they change flow ratios into the mid/low 6x% range and why my HL kits come with a 12 degree spit. As well as higher lift to make use of the added flow.

Stock 6.4 cam is a 215/221 which is a 6 degree split and why Comp uses a 8 degree split for there grinds.

If you want to talk to me just let me know.

Jay

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Old 06-05-2016, 08:03 AM   #10
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Im sorry but what do you mean by flow ratio of our heads?
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