Re: Cam Help RB 496
[Re: 47hudson]
#1751181
02/10/15 08:48 PM
02/10/15 08:48 PM
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Joined: Jan 2003
Posts: 10,081 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,081
Frostbitefalls MN (Rocky&Bullw...
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Check out the mm305 grind in the comp cams catolog. You have the cubes to use that cam, and it has great .200 duration numbers. You will need 5500 to 6000 stall to make good use of it though.
Last edited by gregsdart; 02/10/15 08:50 PM.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Cam Help RB 496
[Re: 47hudson]
#1751182
02/10/15 10:49 PM
02/10/15 10:49 PM
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Joined: Aug 2003
Posts: 43,718 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,718
Bend,OR USA
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Quote:
Looking to change the camshaft in my engine. The engine is a 496" RB with approx. 12.5-1 comp. Indy 440-1 heads (mild porting and bowl blend) 1050 dominator running E-85. the current camshaft is an older Hughes grind:HEV5663BS with 1.6 rockers INT .626" EXH .642" duration @.050 int: 256 exh: 265 lobe sep: 108 The car is 3020lbs with me in it, 4500 dynamic converter, 727 trans, 471 gears, 33" tire. Foot brake the car. It currently runs 6.20s in the 1/8th has been 9.70s in the 1/4. I had been told by Hughes I could use a little more camshaft and was hoping to get some opinions of what I should be looking for from some of you who know more than me. Thanks
Dude, that is impressive, especially in that car I wonder how many racers that didn't know your car where wondering what is that car doing in this staging line the first time they saw it
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Cam Help RB 496
[Re: 47hudson]
#1751184
02/11/15 01:44 PM
02/11/15 01:44 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... a 496" RB with approx. 12.5-1 comp. Indy 440-1 heads (mild porting and bowl blend) 1050 dominator running E-85. the current camshaft is an older Hughes grind:HEV5663BS with 1.6 rockers INT .626" EXH .642" duration @.050 int: 256 exh: 265 lobe sep: 108... I had been told by Hughes I could use a little more camshaft...
A little more cam? I'd say you're 15-20 degrees short of what that engine wants, depending upon the converter you mentioned.
The "If it was mine..." answer is, I'd try something around 272 at .050" intake, 276 exhaust & 110 LSA installed on 106 ICL. If you had a 5K+ converter, I'd go up around 4 degrees more on both lobes.
But since all my junk are stock-stroke 440s, it's just a s.w.a.g on my part.
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Re: Cam Help RB 496
[Re: B G Racing]
#1751188
02/11/15 10:41 PM
02/11/15 10:41 PM
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Joined: Mar 2010
Posts: 632 MD-USA
Dodgeguy101
mopar
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mopar
Joined: Mar 2010
Posts: 632
MD-USA
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Quote:
The engine combo would love a 650/650 lift-290/290-108 cl.solid flat tappet cam or 680/683-284/288-108cl roller cam.these are with 1.5 rockers,1.6 is even better.We used these cams in many builds.
If you want it right, listen to this man.
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Re: Cam Help RB 496
[Re: B G Racing]
#1751189
02/11/15 10:46 PM
02/11/15 10:46 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
The engine combo would love a 650/650 lift-290/290-108 cl.solid flat tappet cam or 680/683-284/288-108cl roller cam.these are with 1.5 rockers,1.6 is even better.We used these cams in many builds.
This man has built more than anyone else you can name--Believe Him! That 650 solid dialed in right--I like advanced to around 102 in a 440 and 105 in a 500 ( we usually race 1/8th) is one of the best cams in that combo on earth! Fiddle around with numbers until you go blind--it will still beat 90 % of the choices you will make--You were talking to another cam guru at Hughes--and ?? That 650 solid will shock you at how well it works--Period! It really needs stout springs and titanium retainers are a 100% MUST with it as well but when degreed correctly it is unbeatable with your combo-which is a classic BTW I have used dozens of them over the years and have never been unhappy. Depend on folks that have built Hundreds of big blocks not a few
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Re: Cam Help RB 496
[Re: 47hudson]
#1751190
02/11/15 11:21 PM
02/11/15 11:21 PM
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Joined: Nov 2009
Posts: 3,410 Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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Quote:
Looking to change the camshaft in my engine. The engine is a 496" RB with approx. 12.5-1 comp. Indy 440-1 heads (mild porting and bowl blend) 1050 dominator running E-85. the current camshaft is an older Hughes grind:HEV5663BS with 1.6 rockers INT .626" EXH .642" duration @.050 int: 256 exh: 265 lobe sep: 108 The car is 3020lbs with me in it, 4500 dynamic converter, 727 trans, 471 gears, 33" tire. Foot brake the car. It currently runs 6.20s in the 1/8th has been 9.70s in the 1/4. I had been told by Hughes I could use a little more camshaft and was hoping to get some opinions of what I should be looking for from some of you who know more than me. Thanks
3020#... That is light,,,the car doesn't look 'light'.
If you like drag racing, support your local track.
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Re: Cam Help RB 496
[Re: 47hudson]
#1751195
02/12/15 01:11 PM
02/12/15 01:11 PM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Thanks for all the info, that's a lot bigger bump stick than what I was looking at. I will be changing the springs to match the cam but I am still running the original Indy rockers, retainers etc. that came on my heads, am I going to go beyond what these parts will regularly handle? I don't have much of a budget so I need to make sure my parts will last a few seasons. Other than the Hughes cam mentioned does anyone have a shelf part # for a good cam I need to purchase the cam lifters and springs soon.
We use these cams with the Indy rockers and retainers with good results.Choose a good spring with aprox.225 to 250 lbs on the seat and 500 to 600 lbs. open.For best upgrades use 10 degree titanium retainers and 10 degree locks then you can use a little more spring pressure if you want.With the setup we have mentioned you can get a lot of service and life.The cams can be purchased through Comp Cams and Indy.
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Re: Cam Help RB 496
[Re: Eric]
#1751196
02/12/15 01:12 PM
02/12/15 01:12 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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i would change the converter to a 53-5500 before I change the cam. Even if you change the cam you will still need to change to converter
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Cam Help RB 496
[Re: 47hudson]
#1751198
02/12/15 04:32 PM
02/12/15 04:32 PM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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Cant help on the info but please post your results when you take it out because i'm thinking of giving this cam a try in my 440. Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: Cam Help RB 496
[Re: B G Racing]
#1751199
02/12/15 04:49 PM
02/12/15 04:49 PM
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Joined: Jan 2003
Posts: 16,936 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,936
NC
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Quote:
We use these cams with the Indy rockers and retainers with good results.Choose a good spring with aprox.225 to 250 lbs on the seat and 500 to 600 lbs. open.For best upgrades use 10 degree titanium retainers and 10 degree locks then you can use a little more spring pressure if you want.
Those pressures are a lot higher than the Comp 925-16 springs.
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