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gains from 280h to xr286r solid roller

14K views 17 replies 6 participants last post by  ovelle 
#1 ·
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
 
#3 ·
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.
 
#6 ·
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.
 
#10 ·
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.
 
#11 ·
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!
 
#13 ·
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.
 
#15 ·
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
 
#16 ·
You are going to need around 325-350 HP to get into the mid 12 sec range. This is assuming you get the car to hook, and I still feel your current converter will hold you back a bit, however that converter will probably be a lot more street friendly. Your current carb will work, but you will be giving up a bit of ET, but nothing you would notice on the street. I just feel your engine, heads, and roller cam combination would benefit from a little bit larger carb, but I wouldn't get to hung up on that right now.

I would seriously opt for the smaller 274 cam and keep the rpm intake. Getting one of these big A-bodies down the dragstrip is all about low and mid range torque. This is aacomplished by keeping low rpm air velocity up, which is what the rpm intake will help to accomplish. Bigger is not always better!!!!
 
#18 ·
Description

BRAND NEW! Small block Chevy solid lifter street roller camshaft. This series of street rollers, offer faster approach ramps than most of the street rollers on the market today. They need good valve springs & rocker arms to deliver the throttle response, awesome torque & reliability, that the smart hot rodder demands!! It's an ideal street/strip cam in 350-400 cars & needs 2800 stall converter or 4 speed, headers, 650+ carb & 390 or lower gears. RPM range is 3000-6800 RPM with lopie idle. Specs are 234 intake @ .050 & 242 exhaust, lift is 543, intake & 550 exhaust. Ground on 110 L/C. Uses the cast distrbutor gear.

PREDATOR CAMS

ENGINE: 265-400 Chevy

CAM GRIND NO: SR3523-3524-10-4A

INTAKE EXHAUST

DURATION .050: 234 242

LOBE LIFT: .362 .367

LOBE SEPARATION: 106 114

ADVERTISED DURATION: .020 267 276

GROSS VALVE LIFT: 1.5 543 550

VALVE LASH ( HOT): .020 .020


what about this cam?good?no good?
shane
 
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