XE276 or 280XFI Cam for HSR?
02-23-2014, 04:01 PM
#1
XE276 or 280XFI Cam for HSR?
I'm a bit confused on what I wanna get. A good friend of mine (TunedPerformance) gave me 2 cams to choose from, xe276 or 280xfi. My setup is as follows: ported HSR plenum and base, AFR 1040 heads, Summit Racing 1.6 aluminum roller rockers, EDL TES headers and y pipe. I will be getting a custom tune from TunedPerformance based on data logging. Any advice guys?
02-24-2014, 01:00 AM
#6
Re: XE276 or 280XFI Cam for HSR?
LB9GTA, I looked up the cam on Comps website and I couldn't help but notice the notes at the bottom. It states;
2 [2] Requires machining on cylinder heads.
Did you have to do any machining to your heads? Also what springs are you using. My main concern is the springs binding. Thanks.
2 [2] Requires machining on cylinder heads.
Did you have to do any machining to your heads? Also what springs are you using. My main concern is the springs binding. Thanks.
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02-24-2014, 06:26 PM
#8
Re: XE276 or 280XFI Cam for HSR?
LB9GTA, I looked up the cam on Comps website and I couldn't help but notice the notes at the bottom. It states;
2 [2] Requires machining on cylinder heads.
Did you have to do any machining to your heads? Also what springs are you using. My main concern is the springs binding. Thanks.
2 [2] Requires machining on cylinder heads.
Did you have to do any machining to your heads? Also what springs are you using. My main concern is the springs binding. Thanks.
I didnt do any machine work.
In saying that, my afr 195s came with 8020 valve springs. They were floating and slightly binding.
I am upgrading to afr's 8017 springs.
Are you using a flat tappet hydraulic or roller cam?
03-04-2014, 08:23 AM
#9
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Re: XE276 or 280XFI Cam for HSR?
This is for a 350 (355)? Don't overlook the XFI268, or similar, cam. I went from a 268 to a 280 on my HSR setup, gained 10whp up top but lost 25ft./lbs. in the midrange; XFI268 did 387whp / 375wtq, 280 did 397whp / 350 wtq. I liked the overall power curve of the 268 better, a little, but at 5k RPM the 280 does start to rip, hard.
Bill
Bill
03-04-2014, 05:47 PM
#10
Re: XE276 or 280XFI Cam for HSR?
I think that means if you want to use the "503-16" valve seals, you need to do machine work.
I didnt do any machine work.
In saying that, my afr 195s came with 8020 valve springs. They were floating and slightly binding.
I am upgrading to afr's 8017 springs.
Are you using a flat tappet hydraulic or roller cam?
I didnt do any machine work.
In saying that, my afr 195s came with 8020 valve springs. They were floating and slightly binding.
I am upgrading to afr's 8017 springs.
Are you using a flat tappet hydraulic or roller cam?
03-04-2014, 05:51 PM
#11
Re: XE276 or 280XFI Cam for HSR?
This is for a 350 (355)? Don't overlook the XFI268, or similar, cam. I went from a 268 to a 280 on my HSR setup, gained 10whp up top but lost 25ft./lbs. in the midrange; XFI268 did 387whp / 375wtq, 280 did 397whp / 350 wtq. I liked the overall power curve of the 268 better, a little, but at 5k RPM the 280 does start to rip, hard.
Bill
Bill
03-04-2014, 07:30 PM
#12
Re: XE276 or 280XFI Cam for HSR?
It is lazy down low in a 350. Its a big cam despite the 113 lsa. 4000 stall is optimal at track with HSR and good heads. Can drive on stock stall tho with good tuning but its lazy. Likes gear. Likes rpm. 4500+ it starts to rip and strong as hell from 5500-6500.
If thats too much step down to something between the 268 and custom xfi lobe 274-276. They make them in 2 deg increments from 218 at .050 to 230 at .050 so you can really dial in a "inbetween" cam. I like a 224/228 ish cam in a good headed 355 motor on a 108-110 lsa
If thats too much step down to something between the 268 and custom xfi lobe 274-276. They make them in 2 deg increments from 218 at .050 to 230 at .050 so you can really dial in a "inbetween" cam. I like a 224/228 ish cam in a good headed 355 motor on a 108-110 lsa
03-04-2014, 11:50 PM
#13
Re: XE276 or 280XFI Cam for HSR?
Agreed. If you have a 350 with lots of compression, and have a high stall, and don't do much street driving, go with the 280xfi.
If not, go with the 268xfi.
How much compression you running?
Gonna run nitrous?
What stall you got?
If not, go with the 268xfi.
How much compression you running?
Gonna run nitrous?
What stall you got?
03-05-2014, 10:56 PM
#17
Re: XE276 or 280XFI Cam for HSR?
So was it a bad choice to make?
03-06-2014, 07:00 AM
#18
Re: XE276 or 280XFI Cam for HSR?
There are 4 runners that curve abit and not as straight to the valve as other 4. Those runners i would cut back the one wall to improve the direct shot at the valve but all that really isnt necessary for your build.
Rounding off the edges at the top of the intake where plenum meets base is a good idea. I just wouldnt shorten the divider wall since runner length is already sized for 6000-6500 rpm on most motors. Shorter starts to push that closer to 7000 like a miniram although you really would need to shorten to match the miniram
Rounding off the edges at the top of the intake where plenum meets base is a good idea. I just wouldnt shorten the divider wall since runner length is already sized for 6000-6500 rpm on most motors. Shorter starts to push that closer to 7000 like a miniram although you really would need to shorten to match the miniram
03-06-2014, 04:36 PM
#19
Re: XE276 or 280XFI Cam for HSR?
There are 4 runners that curve abit and not as straight to the valve as other 4. Those runners i would cut back the one wall to improve the direct shot at the valve but all that really isnt necessary for your build.
Rounding off the edges at the top of the intake where plenum meets base is a good idea. I just wouldnt shorten the divider wall since runner length is already sized for 6000-6500 rpm on most motors. Shorter starts to push that closer to 7000 like a miniram although you really would need to shorten to match the miniram
Rounding off the edges at the top of the intake where plenum meets base is a good idea. I just wouldnt shorten the divider wall since runner length is already sized for 6000-6500 rpm on most motors. Shorter starts to push that closer to 7000 like a miniram although you really would need to shorten to match the miniram
03-06-2014, 11:05 PM
#20
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Car: 1984 Trans Am WS6
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Re: XE276 or 280XFI Cam for HSR?
Back before the XFI cams were developed I got me a 230/236 on a 112 LSA created using what became the XFI lobe; and I use a 110 degree intake center so it's close to what became the XFI280. It's a nice cam for a 385 stroker; pulls good to about 6200 RPM.
If you want to hear what it sounds like, I just started the car yesterday for the first time since about 2009. Here's a 48 second clip of the cam idle at about 1100 RPM; not quite fully warmed up.
If you want to hear what it sounds like, I just started the car yesterday for the first time since about 2009. Here's a 48 second clip of the cam idle at about 1100 RPM; not quite fully warmed up.
03-07-2014, 03:56 PM
#21
Re: XE276 or 280XFI Cam for HSR?
Back before the XFI cams were developed I got me a 230/236 on a 112 LSA created using what became the XFI lobe; and I use a 110 degree intake center so it's close to what became the XFI280. It's a nice cam for a 385 stroker; pulls good to about 6200 RPM.
If you want to hear what it sounds like, I just started the car yesterday for the first time since about 2009. Here's a 48 second clip of the cam idle at about 1100 RPM; not quite fully warmed up.
http://youtu.be/1TFtCh1psw8
If you want to hear what it sounds like, I just started the car yesterday for the first time since about 2009. Here's a 48 second clip of the cam idle at about 1100 RPM; not quite fully warmed up.
http://youtu.be/1TFtCh1psw8
03-07-2014, 08:09 PM
#22
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Re: XE276 or 280XFI Cam for HSR?
have the 280xfi in my car 385 with a SuperRam... I think it's a good cam, sure it will like the HSR even more
03-09-2014, 05:13 PM
#24
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Re: XE276 or 280XFI Cam for HSR?
You could always advance or retard the cam on instal to change the power curve just saying
just saying Last edited by scamaro355; 03-09-2014 at 05:36 PM.
04-29-2014, 11:09 PM
#25
Re: XE276 or 280XFI Cam for HSR?
It is lazy down low in a 350. Its a big cam despite the 113 lsa. 4000 stall is optimal at track with HSR and good heads. Can drive on stock stall tho with good tuning but its lazy. Likes gear. Likes rpm. 4500+ it starts to rip and strong as hell from 5500-6500.
If thats too much step down to something between the 268 and custom xfi lobe 274-276. They make them in 2 deg increments from 218 at .050 to 230 at .050 so you can really dial in a "inbetween" cam. I like a 224/228 ish cam in a good headed 355 motor on a 108-110 lsa
If thats too much step down to something between the 268 and custom xfi lobe 274-276. They make them in 2 deg increments from 218 at .050 to 230 at .050 so you can really dial in a "inbetween" cam. I like a 224/228 ish cam in a good headed 355 motor on a 108-110 lsa
I wouldn't run it in a 350 for a weekend cruiser or daily driver. The 280XFI in a 350 is more of a drag strip camshaft, possibly road race. I have the 280 XFI in my 383 with AFR 195's and ~10.75:1 CR and it bucks a little if you try to drive it below 1,600 RPM making parking lots and crawling traffic not ideal conditions. Dyno numbers are nice to brag about but don't be like Mustang guys who make XXX horsepower but it's at 7K RPM, requires 4.11 gears minimum and is still slow off the line and at short distances. You will get more enjoyment (from better power in the lower range) out of a smaller cam such as the 268 XFI or slightly larger.
05-03-2014, 11:22 PM
#26
Re: XE276 or 280XFI Cam for HSR?
Yup. I already bought me the XFI-268
I wouldn't run it in a 350 for a weekend cruiser or daily driver. The 280XFI in a 350 is more of a drag strip camshaft, possibly road race. I have the 280 XFI in my 383 with AFR 195's and ~10.75:1 CR and it bucks a little if you try to drive it below 1,600 RPM making parking lots and crawling traffic not ideal conditions. Dyno numbers are nice to brag about but don't be like Mustang guys who make XXX horsepower but it's at 7K RPM, requires 4.11 gears minimum and is still slow off the line and at short distances. You will get more enjoyment (from better power in the lower range) out of a smaller cam such as the 268 XFI or slightly larger.
I wouldn't run it in a 350 for a weekend cruiser or daily driver. The 280XFI in a 350 is more of a drag strip camshaft, possibly road race. I have the 280 XFI in my 383 with AFR 195's and ~10.75:1 CR and it bucks a little if you try to drive it below 1,600 RPM making parking lots and crawling traffic not ideal conditions. Dyno numbers are nice to brag about but don't be like Mustang guys who make XXX horsepower but it's at 7K RPM, requires 4.11 gears minimum and is still slow off the line and at short distances. You will get more enjoyment (from better power in the lower range) out of a smaller cam such as the 268 XFI or slightly larger.
05-05-2014, 07:42 AM
#28
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Re: XE276 or 280XFI Cam for HSR?
i just put together a 350 build, hsr, rhs aluminum heads 200/64 and a CC xr276hr. good cam, pulls harrrd above 3500 but still good power down low. no dyno numbers though
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