gains from 280h to xr286r solid roller - Chevelle Tech
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  #1  
Old Jan 30th, 05, 1:17 PM
ovelle ovelle is offline
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350 4.060
protoplines 64cc 200cc
10:27-1 cr
170 psi cranking pressure
perf rpm

what gains would i expect going from 280h hyd and rpm intake to xr286r solid roller and super victor intake??
or if you guys could suggest a better solid roller please feel free wanting the most out of this motor..
shane
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1978 C/10, 496 rect irons, 4L80E, 3500 stall, 4:11's eaton limited slip..
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  #2  
Old Jan 31st, 05, 12:20 AM
ovelle ovelle is offline
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anybody????
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  #3  
Old Jan 31st, 05, 5:44 AM
71454Chevelle 71454Chevelle is offline
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Saw an article in one of the car magazines a few year back and they did a cam swap in a 440 Mopar.

It was a mild street / strip setup with midly ported heads, 10:1 scr, 750 Holley, don't remember what intake.

It had an Isky Mega 280 hydraulic cam (same as a Comp 280H). They swapped in a Comp XE solid roller XR280R (one step smaller than the cam you're looking at) and the engine picked up around 55 hp.
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Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems HP1000
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Mosier axles
30x12.5 ET Street Radial
525++ rwhp
http://www.chevelles.com/showroom/da...0930-00149.jpg
http://www.chevelles.com/showroom/da...m/Vic_Jr_1.JPG
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  #4  
Old Jan 31st, 05, 6:39 AM
godsend godsend is offline
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Would say about 40-50hp. More than any other performance upgrade will do for that money...
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  #5  
Old Jan 31st, 05, 12:06 PM
ovelle ovelle is offline
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kinda what i was thinkin' godsend....
shane
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  #6  
Old Jan 31st, 05, 12:41 PM
67Super Sport 67Super Sport is online now
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When I went to the 274 xtreme solid roller from my 280 solid flat tappet comp magnum I picked up .1-.15 and about 1.5 mph in the 1/8th. This is in a .030 over 396. I'd consider the next smaller 280xr since you are on the border line with your cr. The 286xr looks like it may like a bit more compreesion than you have. Also the Super Victor intake may be a bit over kill. Maybe the victor jr., but I would be inclined to stick with the perf. RPM for a street car for good crisp off idle performance. You will probably want more carb as well.

I would also call comp and have them custom grind one on a steel billet core, and a slightly tighter LSA while they're at it. Maybe 108 LSA instead of the 110. My first xtreme roller was on a regular cast core cam (as they all are off the shelf) and with the spring pressures of a roller it grooved the lobes on the cam after one season. I sent it back and had the new one custom ground on a steel billet core on a 108 LSA. From an in house source at comp I was told the new extreme energy profiles are hard on the cast cores especially the solid roller profiles. Just a suggestion. Good luck.
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67 Chevelle SS
460 BBC, TH400, 4.10 gear, ATI 8" converter
Best 1/8- 6.53 @104 mph 1.36 60'
Best 1/4- 10.51 @125 mph 1.41 60'

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  #7  
Old Jan 31st, 05, 12:45 PM
JOHN WILSON JOHN WILSON is offline
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Shane, consider keeping the RPM. The 286 cam and 10.7:1 comp won't get the rpm's high enough to make a Super Vic work on a 350.
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  #8  
Old Jan 31st, 05, 12:58 PM
ovelle ovelle is offline
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think they suggest open plane for that cam.i'll go back and look.what about vic jr.
shane
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  #9  
Old Jan 31st, 05, 1:07 PM
ovelle ovelle is offline
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or hows about 288ar-6
needs 10:1 cr rpm 3200-6200 adv.288/296 630/630
106 lsa
shane
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  #10  
Old Jan 31st, 05, 2:10 PM
67Super Sport 67Super Sport is online now
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No good. You are better off with the xr286r than you are with that cam. That is going to be a real peaky cam. It needs a lot more converter than you have, and it will most likely produce max performance in a tight rpm range between 4000-6200. By looking at your car I would say it is a street car and not a strip only or bracket car. You are getting way ahead of your self with this type of setup for the street. You will be much happier with a small solid roller such as the xr274r, or xr280r for both reliability and street performance.

I love my xr274r. My car is a brakcet car. With my old 10" 4500 rpm converter it was very repsonsive off idle, and was pretty streetable. With the new 8" ATI it will rip your head off from idle or anywhere else in the rpm range, but it is not very streetable as it is only operating in a rpm range between 5000-6500 rpms with this converter. When we were having converter problems last year I had to throw an old 11" TCI break away converter in that stalls to roughly 2800-3000. The car was a slug from idle with this converter.

The ? is what are your goals. Everyday driver, weekend cruiser, or all out dragstrip ride.
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Chad Harris
67 Chevelle SS
460 BBC, TH400, 4.10 gear, ATI 8" converter
Best 1/8- 6.53 @104 mph 1.36 60'
Best 1/4- 10.51 @125 mph 1.41 60'

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  #11  
Old Jan 31st, 05, 2:14 PM
71454Chevelle 71454Chevelle is offline
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I tend to agree with what Chad posted. The XE286R might be a bit on the large side for your SCR and 350 inches.

I would look at the 274 or the 280 solid roller from the XE line. Have it custom ground on a billet core with a cast dist gear and a 107 or 108 LSA. One of these cams with a Performer RPM and a 750HP carb would make a real nice setup! [img]graemlins/thumbsup.gif[/img]
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Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems HP1000
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Mosier axles
30x12.5 ET Street Radial
525++ rwhp
http://www.chevelles.com/showroom/da...0930-00149.jpg
http://www.chevelles.com/showroom/da...m/Vic_Jr_1.JPG
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  #12  
Old Jan 31st, 05, 3:39 PM
67Super Sport 67Super Sport is online now
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Yes, what Darren said about the distributer gear as well. I over looked that. My core has the cast gear, so you can run a regular ole iron drive gear.
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Chad Harris
67 Chevelle SS
460 BBC, TH400, 4.10 gear, ATI 8" converter
Best 1/8- 6.53 @104 mph 1.36 60'
Best 1/4- 10.51 @125 mph 1.41 60'

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  #13  
Old Jan 31st, 05, 4:32 PM
greg_moreira greg_moreira is offline
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Well, Id agree to stick with the XR280 cam. Its a real close match to your compression and its a nice size in a 350(actually more like 360 with your overbore). I wouldnt want to stretch it much further than that if you intend on fairly regular street driving, cause it may get a little old.

As far as the manifold, you could really go either way Id say. Either the rpm you got now or the victor junior(not super victor) would be a good match. With that in mind(that yours is good), Id definitely stick with yours for now so that you have an accurate back to back comparison of what happened with the cam change , but no other changes at the time. However, Id still beleive that the victor junior will show a gain over 5500 or so, so keep that in mind if you want a little better number at the track down the road.

The vic will probably give up some bottom end compared to a dual plane....but, based on the drivetrain specs in your signature, the bottom end losses that you ACTUALLY NOTICE will be minimal, if any. With that converter you got and the 4.11 gears, you wont be relying on power a whole lot below 3500rpm, and below that rpm is where the single plane manifold should be "softest" compared to the dual plane. Thats why youd probably never feel it much(cause you wont be runnin there). From right around 3500rpm and up, it should be about equal to the dual plane, and it should start to come alive a little better around 5500(give or take a little)

Back to what I was sayin, just swap the cam to see for sure what just the cam change does for you. And, if you want to go faster, I do beleive that the victor would help out a bit for bracket racing. But if you go straght to the victor junior, you will never know for sure just how much that cam swap helped cause youd be making other changes at the same time.
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  #14  
Old Jan 31st, 05, 8:47 PM
pdq67 pdq67 is offline
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FWIW, Imho, an Isky 280 Mega is a lot more cam then a CC 280 Magnum!

Anyway, please, bttt...

pdq67
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  #15  
Old Feb 1st, 05, 3:45 AM
ovelle ovelle is offline
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ultimate goal solid 12.00's (mid would be nice)
i got a toyota carolla for transportation,i've got a toy for fun..
you guys dont think my 650 mighty will be enough??hate to shell out another 500.00+ for another carb...
shane
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1978 C/10, 496 rect irons, 4L80E, 3500 stall, 4:11's eaton limited slip..
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