XR288HR vs XR274R help decide, or give me a better option - Team Camaro Tech
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post #1 of 32 (permalink) Old Jan 13th, 10, 10:29 AM Thread Starter
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XR288HR vs XR274R help decide, or give me a better option

Rather than hi-jacking the solid roller thread

First, I'm inclined to have either of these ground on 108LSA/104ICL...

Secondly, assuming the XR274R is indeed a better power maker, how much are we talking, and how is it achieved?

hydro-roller XR288HR (with 1.6 rockers?)
http://www.compcams.com/Cam_Specs/Ca...?csid=161&sb=0

VS
solid roller XR274R (with 1.5 rockers?)
http://www.compcams.com/Cam_Specs/Ca...?csid=305&sb=0

I'm trying to stay close to .600 lift with the good flow characteristics of the AFR's
Max RPM 6000-6500

Going in a 383 11:1 compression, AFR 195 eliminators
Performer RPM intake
800CFM qjet
Manual brakes (vacuum not a concern)
Super T-10 4 speed trans, 3:73 rear 26" tires

Feel free to make another recommendation if you don't like either of these.
Thanks

Last edited by Spames; Jan 13th, 10 at 11:08 AM.
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post #2 of 32 (permalink) Old Jan 13th, 10, 11:17 AM
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Re: XR288HR vs XR274R help decide, or give me a better option

I have had a hyd roller and switched over to a solid roller (XR280R) and like it alot better. I have 1.6 rocker on intake and 1.5 on exhaust. I think you will be happier with solid roller vs hydraulic. I think your combo could handle the 280XR very easily.

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post #3 of 32 (permalink) Old Jan 13th, 10, 11:44 AM
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Re: XR288HR vs XR274R help decide, or give me a better option

The rpm you are trying to maintain, tells me to stick with the solid 274 roller as I had the 288 comp hydra roller and it being a hydraulic, limits some rpm , especially if you have no rev kit.

I would also suggest you maintain high spring pressures with either cam to control lifters on the opening and closing ramps of the Comp cam if its a billet. I would not recommend high spring pressures over 140# on the "austratempered " comp core. Its basically a cast core. I had this cast version and had problems with flakes of cast coming off the opening ramp as well as fuel pump eccentric lobe wear.

Since going to one of UdHarolds billet grinds, I have had no issues.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E
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post #4 of 32 (permalink) Old Jan 13th, 10, 12:06 PM Thread Starter
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Re: XR288HR vs XR274R help decide, or give me a better option

Quote:
Originally Posted by zdld17 View Post
Since going to one of UdHarolds billet grinds, I have had no issues.
What grind did you go with to replace the 288HR? I'll be running an electric fuel pump with a late model 4 bolt vortec block, so no fuel pump issues, but I'll watch out for the high rates on the regular comp cores. Thanks
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post #5 of 32 (permalink) Old Jan 13th, 10, 12:14 PM Thread Starter
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Re: XR288HR vs XR274R help decide, or give me a better option

Quote:
Originally Posted by JayBird View Post
I have had a hyd roller and switched over to a solid roller (XR280R) and like it alot better. I have 1.6 rocker on intake and 1.5 on exhaust. I think you will be happier with solid roller vs hydraulic. I think your combo could handle the 280XR very easily.
I was trying to keep torque up on the low side as well. This sled weighs about 4050 with me in it. -- Wouldn't something with more duration move the power curve up a good bit?
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post #6 of 32 (permalink) Old Jan 13th, 10, 01:33 PM
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Re: XR288HR vs XR274R help decide, or give me a better option

Spames, It is really a personal preference...I happen to prefer the "no worries" aspects of the hydraulic cam and have been very happy with my XE294HR.

I would venture a guess that the performance between the two would be nearly identical. You could probably get more RPM out of the solid but HP would be within 10 of each other.

69 Camaro, 3450lbs., 400, Cal Tracs, Coan 10", TH400, 3.50 gear, no trailer
D1SC blow thru, pump gas, 9:1, ~10 PSI,
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post #7 of 32 (permalink) Old Jan 13th, 10, 01:51 PM
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Wink Re: XR288HR vs XR274R help decide, or give me a better option

Quote:
Originally Posted by Spames View Post
I was trying to keep torque up on the low side as well. This sled weighs about 4050 with me in it. -- Wouldn't something with more duration move the power curve up a good bit?
My car doesnt weight 4000lbs, but with a 383, good heads as you have, I really dont think torque is gonna be a problem. I suspect you will make 400-425 tq around 3200-3400rpm and make 500lbs by 4500rpm. I think you like like the HP and torque curve that a solid roller makes and still turn more rpms. Its your decision as its your $$$.

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post #8 of 32 (permalink) Old Jan 13th, 10, 02:59 PM Thread Starter
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Re: XR288HR vs XR274R help decide, or give me a better option

I'm thinking it would cost about $400 extra to do a solid roller over hydraulic.

Ls7 lifters + 288hr = $400

solid link-bar style lifters + solid roller cam = $800

I'm trying to figgure out if it's worth it for a 6000-6500 rpm 383.
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post #9 of 32 (permalink) Old Jan 13th, 10, 11:29 PM
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Re: XR288HR vs XR274R help decide, or give me a better option

Hey spames. For what it's worth here is my 355 with the xr274r idling and blipping a bit. It. Idles down to 800 rpm but gets a little rough there. I don't run power brakes so I can't comment on that. I just drove the car once on a shakedown run so I can't give you too many impressions on power. With the manual trans, the car does buck under easy acceleration at less than 1800rpm. I wanted the 280r but my engine builder predicted correctly that the car would buck, and that I needed a bit more displacement to go with the 280r. Those 2 cams run the same springs I believe, so it was really a toss up. I spoke with comp cams who said the power difference between the 2 is small in a 355l, and that lashing the 274 tight will get you half way to the Duration specs of the 280. Just watch piston to valve clearance. It's not a gimme with a solid roller.

Hope that helps! Feel free to ask more questions

Your planned combo is pretty similar to what I have. 355, 200cc pro topline heads with mild work, port matched air gap with a 1" spacer, pro systems double pumper. I hope to be on a dyno next month so stay tuned!

Last edited by sik68; Jan 13th, 10 at 11:42 PM.
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post #10 of 32 (permalink) Old Jan 14th, 10, 05:26 AM Thread Starter
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Re: XR288HR vs XR274R help decide, or give me a better option

Sounds nice - seems very responsive!
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post #11 of 32 (permalink) Old Jan 14th, 10, 07:38 AM
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Re: XR288HR vs XR274R help decide, or give me a better option

Quote:
Originally Posted by Spames View Post
What grind did you go with to replace the 288HR? I'll be running an electric fuel pump with a late model 4 bolt vortec block, so no fuel pump issues, but I'll watch out for the high rates on the regular comp cores. Thanks
UDH CCC 282/290 with 112 LSA. Idles like a stocker but flys well with the new Eliminator AFR 195 heads, I am using retro rollers but if you can find a late model block , you can use the stock rollers and spring dog bones. Local chassis dyno recorded max hp 375 rwhp @ 6130 rpm. Tq was about 355 max @ about 5k, Power seems to fall off after 6100, but its a street car and hyd rollers ..

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E
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Last edited by zdld17; Jan 14th, 10 at 07:52 AM.
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post #12 of 32 (permalink) Old Jan 14th, 10, 08:20 AM Thread Starter
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Re: XR288HR vs XR274R help decide, or give me a better option

Quote:
Originally Posted by zdld17 View Post
UDH CCC 282/290 with 112 LSA. Idles like a stocker but flys well with the new Eliminator AFR 195 heads, I am using retro rollers but if you can find a late model block , you can use the stock rollers and spring dog bones. Local chassis dyno recorded max hp 375 rwhp @ 6130 rpm. Tq was about 355 max @ about 5k, Power seems to fall off after 6100, but its a street car and hyd rollers ..
Nice!

I have a like new GMPP 880 4 bolt block with all the factory hydraulic lifter retainers already.

I also just got the latest (2009 edition) "How to build max performance chevy small blocks on a budget" by D.Vizard - I'm planning on studying that book pretty hard. Hopefully I learn something
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post #13 of 32 (permalink) Old Jan 14th, 10, 09:01 PM
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Re: XR288HR vs XR274R help decide, or give me a better option

Quote:
Originally Posted by sik68 View Post
Hey spames. For what it's worth here is my 355 with the xr274r

Hope that helps! Feel free to ask more questions
YouTube- Broadcast Yourself.

I watched your first drive. Looks like it is going to be a fun car!
Good to see someone having some fun. It makes up for all those days you want to throw a wrench at a car.
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post #14 of 32 (permalink) Old Jan 14th, 10, 10:10 PM
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Re: XR288HR vs XR274R help decide, or give me a better option

There's an XR282HR in between those, essentially what I have in a 9.5:1 383. Runs hard.

Edit - Nevermind - noticed the 274 is an SR.
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post #15 of 32 (permalink) Old Jan 14th, 10, 10:12 PM
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Re: XR288HR vs XR274R help decide, or give me a better option

Quote:
Originally Posted by zdld17 View Post
UDH CCC 282/290 with 112 LSA. Idles like a stocker but flys well with the new Eliminator AFR 195 heads, I am using retro rollers but if you can find a late model block , you can use the stock rollers and spring dog bones. Local chassis dyno recorded max hp 375 rwhp @ 6130 rpm. Tq was about 355 max @ about 5k, Power seems to fall off after 6100, but its a street car and hyd rollers ..
Don - are you making those RWHP numbers in a 306? Impressive!
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