New rollercam 72 454
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
New rollercam 72 454
i am about to put in a roller cam in my car, the XR276.
Need advice.
There is a bunch of different nr:s of that cam.
Wich one is for me?
`72 454, stock th400, comp 9:1,stock intake, LT headders.
Need advice.
There is a bunch of different nr:s of that cam.
Wich one is for me?
`72 454, stock th400, comp 9:1,stock intake, LT headders.
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
The "XR276" looks like a Comp Cams brand camshaft model number, but I don't see a listing for an "XR276" within any of their hyd or solid roller cams for your '72 454 ! ?
Can you please clarify this a little ? I'll lend a hand if I can.
Can you please clarify this a little ? I'll lend a hand if I can.
Pro
Joined: Nov 2007
Posts: 710
Likes: 0
From: Northern Florida
Heres an idea of what my cam sounds like :
https://www.corvetteforum.com/forums...post1590471571
Last edited by TheycallmeDave; Sep 11, 2015 at 09:09 PM.
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
If you do a search on compcams website it will show.
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Sounds like a good choice if your motor is pretty much stock with headers. Ive got a 1970 454 cid, Coupe, 9.5 CR, with better flowing aluminum Heads, airgap intake, Mighty Demon 800 mech secs Carb, 4 speed.....and I went with a Lunati 232/242 duration , 554 lift, 112 lsa Hyd. Roller Cam with roller rockers and roller lifters. I read an article recently on a very similar Crane Cam and it netted an additional 52 h.p. Yours is a little tamer , so, your looking at maybe 30-35 hp. I have a lope to mine but I love it and the rumpity rump sound ; it doesn't shake bad at idle and its a good low to midrange Cam. Had I had to do it all over again....Id go with Lunati's 623 " lift and 245/244 duration as a BB motor can take quite a bit of duration and lift before its street manners are hampered.
Heres an idea of what my cam sounds like :
https://www.corvetteforum.com/forums...post1590471571
Heres an idea of what my cam sounds like :
https://www.corvetteforum.com/forums...post1590471571
Hope mine gets there with a little milder cam
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Pro
Joined: Nov 2007
Posts: 710
Likes: 0
From: Northern Florida
If you want the lopey rumpity rump sound, just step up the duration on your cam selection. If you want to remain in the low to mid rpm range for street driving then don't exceed a duration of 240 degrees and on a BB motor it wont shake too bad. Personally, I wish I had gone a bit higher in the duration than what I did and higher on the lift too to gain additional hp/tq ; the cubes (468 cid) along with the maximized low end tg from the Carb having annular boosters .... would have done me well in the low range and the higher range of sayyyy 4500 rpms and up. On a small block motor you drastically change the running characteristics of the engine but a BB can handle more duration and lift with less impact ive found.
Drifting
Joined: Jan 2014
Posts: 1,866
Likes: 140
From: Sadieville Kentucky
Saw your post about cams
I am getting ready to rebuild my '71 LS 5 and wondering how big of a cam I can go ? The reason I ask is the previous owner had bought a Comp cam Part # 11-213-3 Gross lift .550intke .550 exhaust
Duration @.050 Intake 244 exhaust 244 is new in the Camp Cams box along with lifters .On the spec sheet it says to use 924-16 springs and there is a set of 936-16 springs with parts I got . Would these parts work with my stock heads or do I need head work done ?
Thanks Much appreciate any help
Wes
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
Hi
Saw your post about cams
I am getting ready to rebuild my '71 LS 5 and wondering how big of a cam I can go ? The reason I ask is the previous owner had bought a Comp cam Part # 11-213-3 Gross lift .550intke .550 exhaust
Duration @.050 Intake 244 exhaust 244 is new in the Camp Cams box along with lifters .On the spec sheet it says to use 924-16 springs and there is a set of 936-16 springs with parts I got . Would these parts work with my stock heads or do I need head work done ?
Thanks Much appreciate any help
Wes
Saw your post about cams
I am getting ready to rebuild my '71 LS 5 and wondering how big of a cam I can go ? The reason I ask is the previous owner had bought a Comp cam Part # 11-213-3 Gross lift .550intke .550 exhaust
Duration @.050 Intake 244 exhaust 244 is new in the Camp Cams box along with lifters .On the spec sheet it says to use 924-16 springs and there is a set of 936-16 springs with parts I got . Would these parts work with my stock heads or do I need head work done ?
Thanks Much appreciate any help
Wes
At 1.350" (.550 lift) ; 924 = 299 lbs, 930 = 348 lbs, 936 = 325 lbs.and within.050" of coil bind , Comp recommends .060" or greater.
All will require machining to the heads.
924 is 1.509" diameter, 930 is 1.550", and 936 is 1.539"
That's a pretty healthy cam even for a 454 street-bound engine, and calls for min.10-1 compression or more. Plus it is a single pattern which really needs an excellent intake to exhaust flow and a very good exhaust system (race car quality).
Last edited by 68post; Sep 14, 2015 at 12:59 AM.
Drifting
Joined: Jan 2014
Posts: 1,866
Likes: 140
From: Sadieville Kentucky
Cam
The premium spring upgrade is the 930/dual springs , it's seat pressure at 1.900" is 153 lbs. The 924/dual springs is 112 lbs at the same height, And the 936/single spring are 147 lbs.
At 1.350" (.550 lift) ; 924 = 299 lbs, 930 = 348 lbs, 936 = 325 lbs.and within.050" of coil bind , Comp recommends .060" or greater.
All will require machining to the heads.
924 is 1.509" diameter, 930 is 1.550", and 936 is 1.539"
That's a pretty healthy cam even for a 454 street-bound engine, and calls for min.10-1 compression or more. Plus it is a single pattern which really needs an excellent intake to exhaust flow and a very good exhaust system (race car quality).
At 1.350" (.550 lift) ; 924 = 299 lbs, 930 = 348 lbs, 936 = 325 lbs.and within.050" of coil bind , Comp recommends .060" or greater.
All will require machining to the heads.
924 is 1.509" diameter, 930 is 1.550", and 936 is 1.539"
That's a pretty healthy cam even for a 454 street-bound engine, and calls for min.10-1 compression or more. Plus it is a single pattern which really needs an excellent intake to exhaust flow and a very good exhaust system (race car quality).
Thank You very much for the information .I live a couple hours from Indy maybe I can stop by to see your Vette ?
Wes
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Desided to skip Compcams, did not get any good answers from them....
Went for Chris Straub`s recomendations and ordered a camset from him.
Specs: 229/241@.050, lift .600/570.
It sounds awesome!
Remains to see how it performs.
Went for Chris Straub`s recomendations and ordered a camset from him.
Specs: 229/241@.050, lift .600/570.
It sounds awesome!
Remains to see how it performs.
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
http://www.compperformancegroupstore...=MARKIVCAMHRXE
..jumps from the XR264HR to the XR282HR.
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
Desided to skip Compcams, did not get any good answers from them....
Went for Chris Straub`s recomendations and ordered a camset from him.
Specs: 229/241@.050, lift .600/570.
It sounds awesome!
Remains to see how it performs.
Went for Chris Straub`s recomendations and ordered a camset from him.
Specs: 229/241@.050, lift .600/570.
It sounds awesome!
Remains to see how it performs.
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
530 planeman , you do not ever have to do 4 bolt main mod. A 2 bolt block will stay together in a boat at 5500 rpm for extended run time. You need 4 bolt for the strip 700 hp 7000 rpm.
Drifting
Joined: Jan 2014
Posts: 1,866
Likes: 140
From: Sadieville Kentucky
Thanks that's what I figured back in my younger days all we wanted was more horsepower and it usually got us in trouble .Now in senior years we just want a nice dependable ride ,in cars and wife's lol
Thanks Wes
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Ok, now is all parts on the way from Straub Tech.
Cam, lifters, pushrods, spings, rollerrockets, new cam gear, and a bunch of other stuff.
So exited to hear how it sounds and performs.
I`ll get back then.
Cam, lifters, pushrods, spings, rollerrockets, new cam gear, and a bunch of other stuff.
So exited to hear how it sounds and performs.
I`ll get back then.
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Update on my engine overhaul.
When my shop began the camswap we did a leakdown and it showed bad cylinders...
Engine is out of the car, ready for a bore to 468cui with Mahle forged pistons and Eagle rods.
Since i ordered the cam parts from Chris Straub i also had him send me pistons and rods and a bunch of other stuff, this will be a masterpiece of an engine 500+hp and 500lbft.
And as a bonus my shop had a complete chassie kit with upper and lower arms front and back, all fully adjustable that a customer wanted to sell at half new price!
Coming summer will be really interesting!!!
When my shop began the camswap we did a leakdown and it showed bad cylinders...
Engine is out of the car, ready for a bore to 468cui with Mahle forged pistons and Eagle rods.
Since i ordered the cam parts from Chris Straub i also had him send me pistons and rods and a bunch of other stuff, this will be a masterpiece of an engine 500+hp and 500lbft.
And as a bonus my shop had a complete chassie kit with upper and lower arms front and back, all fully adjustable that a customer wanted to sell at half new price!
Coming summer will be really interesting!!!
Pro
Joined: Nov 2007
Posts: 710
Likes: 0
From: Northern Florida
Update on my engine overhaul.
When my shop began the camswap we did a leakdown and it showed bad cylinders...
Engine is out of the car, ready for a bore to 468cui with Mahle forged pistons and Eagle rods.
Since i ordered the cam parts from Chris Straub i also had him send me pistons and rods and a bunch of other stuff, this will be a masterpiece of an engine 500+hp and 500lbft.
And as a bonus my shop had a complete chassie kit with upper and lower arms front and back, all fully adjustable that a customer wanted to sell at half new price!
Coming summer will be really interesting!!!
When my shop began the camswap we did a leakdown and it showed bad cylinders...
Engine is out of the car, ready for a bore to 468cui with Mahle forged pistons and Eagle rods.
Since i ordered the cam parts from Chris Straub i also had him send me pistons and rods and a bunch of other stuff, this will be a masterpiece of an engine 500+hp and 500lbft.
And as a bonus my shop had a complete chassie kit with upper and lower arms front and back, all fully adjustable that a customer wanted to sell at half new price!
Coming summer will be really interesting!!!