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548 BBC cam help

  
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548 BBC cam help

 
Bowtie1972 Bowtie1972
New User | Posts: 9 | Joined: 05/13
Posted: 11/11/13
11:18 PM

Here's what it's goin in:  off road only,  52" tractor tire mud bogger.  
I'm picking up a 548 short block on trade this week. Here's the current short blocks specs :

Gen VI 502 block, 4.530" bore x 4.250" stroke. All Eagle forged rotating assembly, Wiseco 13.1 forged pistons (I do not know the cc of the dome yet).  = 548 ci. It also has a Howard's solid roller cam.  # 121233-08.  278/288@ .050" & .732"/.730" lift. 4,800 - 8,000 rpm range.
This was in a drag car with 360 cc heads.

I am putting Dart Pro 1 325 cc aluminum heads on it and a Dart single plane intake with an 1150 Dominator.  (I do not have the carb yet)

My concerns/questions :  
Keeping in mind the application....
1. Will this large of a cam work with a 325 cc head? Or isn't there enough flow to support it?
2. With a larger cubic inch, will this be sluggish til 4,400 when the cam starts pulling?  Or will the sheer cubic inch overcome it?


I'm on the fence about trying it as is or goin with a low .700's lift and 8-10 deg less duration cam.  Maybe 3,500. - 7,500 rpm range.

And what kind of horsepower will this combo make?

Any thoughts or help Would be appreciated. Thanks.  

Dave632 Dave632
Addict | Posts: 2222 | Joined: 07/08
Posted: 11/12/13
07:43 AM

Since this combo is going in a mud bogger and not a drag car I think the smaller intake port will be right. I would also agree with the 8-10 degree less duration on the cam. I think the power being made at a lower rpm would help in moving those huge tires.
As someone who has made the mistake of going too big on intake port, cam, carbs, several times in the past I think I have the experience to comment on this kind of question. Even on my last 632 I had to run the engine over 7000 to get the best ET out of it. This was with 370cfm ported Victor heads and a 300+ degree cam.
As a guess on HP I would say in the 700=725 range.  
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Bowtie1972 Bowtie1972
New User | Posts: 9 | Joined: 05/13
Posted: 11/12/13
12:34 PM

Thank you for your comment... Im even considering dropping a little farther on the cam? Not positive...  

Ive thought of the Lunati VooDOoo..Solid Roller Cam

•Advertised Duration (Int/Exh): 285/293
•Duration @ .050 (Int/Exh): 255/263
•Gross Valve Lift (Int/Exh): .680/.680
•LSA/ICL: 110/106
•Valve Lash (Int/Exh): .018/.018
•RPM Range: 3000-7200
•Includes: Cam Only
Part Number: 40110734

Or another Howards cam.... 121173-10 NA 293 303 261 271 .703 .708 110 106 .022 .022  
3500-7600

possibly this Crower or one smaller...

Performance level  - High RPMINT/EXH -  Dur @ .050” Lift: 268°/279° RR: 1.7/1.7 Gross Lift: .706”/.700” LSA: 110° RPM: 2800 to 7200 Redline: 7700

Let me know what you think.... Thanks again  

Dave632 Dave632
Addict | Posts: 2222 | Joined: 07/08
Posted: 11/13/13
08:36 AM

The Lunati cam seems like a good choice to me. Remember the higher you have to spin a motor to get power the shorter its life is. They usually do make more power at higher rpms though.  
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Bowtie1972 Bowtie1972
New User | Posts: 9 | Joined: 05/13
Posted: 11/13/13
08:05 PM

Ok.. Thanks for the help!  

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/04/13
02:58 PM

i used the comp cams camquest6 program..... it spit out cam #01-712-9 [37]. 260-268 degrees duration at 50. 0.714 inch gross lift, 108 degree LSA. by the way it says your engine LOVES methanol,and a high flow tunnel ram manifold with [2] 1,000 cfm carbs.  

Dave632 Dave632
Addict | Posts: 2222 | Joined: 07/08
Posted: 12/04/13
06:29 PM

Tunnel rams and 2 4s were the way I always liked to go. The last motor had a single 4 on a high rise but the previous 632 in the Beretta had 2-1150s on a sheet metal intake. 5.0s in the 1/8th on motor. I could always pick up about a 1/2 second switching to a tunnel ram over a single 4. In one case on a 350 I picked up about 9 tenths and that was in the 1/8th mile.

Beretta with it's stock little motor?? Smile

MVC 026S  
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dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/04/13
08:24 PM

is that a street racer bluff/come along? i got a mini bike, wanna race?