1. A408Cuda

    A408Cuda FABO Gold Member FABO Gold Member

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    Thanks Rumblefish, i do have a basic idea of how it works, where i get confused one cam might be referred to as street-able while another cam with what appears to be only slightly more lift and duration might be referred to as un-street-able, I just wondered how that is determined without testing in a given engine.. I've also been told that a stroker will tolerate a bigger cam than a non-stroker in the street-able category. Anyhow i don't want to highjack the OP's thread with cam talk and thank you for your response.
     
  2. nm9stheham

    nm9stheham Well-Known Member

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    "streetable" is a highly subjective and unmeasureable term. Even if you test a cam, my/your version of 'streetable' is not someone else's... and tuning and setup enters into it a lot. Really hard to answer that question.... Notice that I am not trying to for the OP LOL
     
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    • rumblefish360

      rumblefish360 So close, yet so far away FABO Gold Member

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      @A408Cuda

      Sorry if I went over known info with you. It was (at least from my point of view) information given generically for those not knowing.

      However, I can look at most cam specs and determine if there going to work the way the op wants or expects. That in itself is pretty broad and general in terms.

      But! The cams timing events, the way the profile is cut and where the timing events happen in relation to the engine and the other lobe have a huge effect on everything. I have spent a generous amount of time learning camshafts (NOT AN EXPERT, but I get it) and I just want to say it is best to keep it simple unless your looking for every last HP or MPG from the combo. It does get confusing.

      Match the duration to the cruise rpm and have the drivetrain compliment it, your good to go.
       
    • A408Cuda

      A408Cuda FABO Gold Member FABO Gold Member

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      No sorry necessary, the knowledge found from people on this site is priceless, and seriously no joke i would love to be able to look at a cam and know what its going to run like, someday maybe but not there yet.:thankyou:
       
    • dragfish

      dragfish Well-Known Member

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    • PRH

      PRH Well-Known Member

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      I’m having a hard time imagining how that conversation went, where after the “street car”(closed exhaust), and 3.23’s were mentioned........ how they ended up recommending that cam......on a 106.
       
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      • Wyrmrider

        Wyrmrider FABO Gold Member FABO Gold Member

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        same question as prh 106???
         
      • 1stgen

        1stgen Member

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        The 186psi cylinder pressure is only calculated as nothing been assembled yet
         
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        • superchargeddrt

          superchargeddrt Well-Known Member

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          This is my Cam specs (1.5 ratio Crane gold rollers). My engine is a 418 (340 based .040 over) 10.5 :1 compression that dynoed at 490 horsepower and 516 torque. My car has manual steering and brakes so there is no extra load on the engine. My converter is a 3500 stall TCI and I am running 355 gears. It is a handful on the street especially if you are not running drag radials, BFGs are NIT gonna cut it. I just got 255/60/15 MT SS tires (the biggest you can put in a stock wheel well with the llips rolled). The idle is rough (but I like it) and like others have said it idles at about 750 RPMs.

          Cam_Card.jpg

           
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          • MOPAROFFICIAL

            MOPAROFFICIAL Well-Known Member

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            Boarder line octane and lean conditions at the top of the range, at your shift points, you can warp those run of the mill stainless exhaust valves in no time. When you first get it going you start out with your carb's out of the box Baseline ...unless you'd already had the combo going before and tuned it from there. You fiddle with the power-valve rating ,Shooters , primary ...secondary...generally we usually leave the secondary alone and do most of the work in the primary but once you start getting into high flowing heads High cylinder pressure and big RPM aaaaand you're using a smaller Street carb ....say a 750, you'll find that you are increasing the secondary Jets eventually with the increased volumetric efficiency with all those 'upgrades'.
            More power, more heat, touchier on available octane...things happen.
             
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            • JBurch

              JBurch Well-Known Member

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              Where to look is at duration, that is what makes a difference
               
            • nm9stheham

              nm9stheham Well-Known Member

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              Lift being equal, you will feel a difference down in the, but, correct, it won't be a big difference for that amount of change.

              IMHO, you start with application and knowledge (experience, that you learn your self or from others). If 'more streetable' is desired, then you move to improve lower- and mid-range torque, and that typically drives to lower durations and cam timing changes (more advanced cam timing) to get the intake to close earlier to help build cylinder pressure higher. With some level of static compression ratio, both work to move the dynamic compression ratio number (DCR) up. That has a direct impact on low to mid RPM torque, but less so on high RPM power. LSA changes (usually a wider LSA) are made to make the very low RPM operations smoother (idle, off-idle).
               
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              • dragfish

                dragfish Well-Known Member

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                your car sounds nice!
                 
              • MOPAROFFICIAL

                MOPAROFFICIAL Well-Known Member

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                But what heads are you using?
                 
              • superchargeddrt

                superchargeddrt Well-Known Member

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                Thanks! I always wanted that sound. I thought something was wrong with the engine when I first started it up in the engine bay . If felt so rough but then it hit me.....I did ask for a 500 horsepower small block LOL
                 
              • superchargeddrt

                superchargeddrt Well-Known Member

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                I am using the Edelbrock Performer RPMs. My machinist went over them to check the valve guides and also installed 2.08 intake valves. My buddy Larry did some mild porting and port matching.
                 
              • MOPAROFFICIAL

                MOPAROFFICIAL Well-Known Member

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                Ouch
                 
              • cpearce

                cpearce Well-Known Member

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                My 408 also uses a Hughes custom cam, and also uses a 106 LSA, and is also a hot street car. In my case the 106 LSA was spec'd to fool engine into thinking it had more than its 10:1 compression at my elevation of 3200 feet. This is in a 69 Swinger with a 4 speed. 3.55 gears only provide rubber at anytime up to 60mph with street tires. The 2.94 gears are actually a lot of fun on highway trips, still a major traction issue in 1st and second gear. I can let clutch completely out in 1st without any throttle input. Current intake is Victor W2, this season I am going to experiment with a dual plane W2 intake for fun. I have 4.10, 3.55, 2.94, and 3.23 chunks to swap around, only one I havent tried is the 3.23 which I feel will be just the ticket for fun all around driving, my 3.09 first gear a833 trans helps with not needing deeper rear gears. Here is my cam, engine made 547 hp, 562 ft/lbs. 20151223_094123.jpg
                 
              • superchargeddrt

                superchargeddrt Well-Known Member

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                Now THAT is stout! I'm thoroughly impressed.
                 
              • rumblefish360

                rumblefish360 So close, yet so far away FABO Gold Member

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                Yea, pretty good for a little cam.
                 
              • superchargeddrt

                superchargeddrt Well-Known Member

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                No doubt about it. You can always tell the people that know what they're doing.
                 
              • dgibby

                dgibby Well-Known Member

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                I run this cam in mine. 10.5-1 with pro comp heads. 2.05/1.88 valves with minor port work with 1.6 rockers. Air gap intake with Holley sniper. 3.91 gears, tires are 235/40R18 (25.4 tall) 727 transmission 3500 converter. Supposed to be 500ish hp 500+ torque. Streetable to me... idles @950 or it will shake your teeth out, melts the tires at will in 1st or 2nd gear, freeway sucks, 65 mph @ 3300 rpm gets old. Best for cruising below 50 mph or 0 to 120 mph. Thinking of going 3.23 this year.

                32B774B0-B1AD-4C03-97FB-8240B30F3B38.jpeg
                 
              • cpearce

                cpearce Well-Known Member

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                Curious if you ever ran it with a carb, or only the sniper? I'm considering getting a sniper kit for mine, I'd like to know any driveability improvements.
                 
              • dgibby

                dgibby Well-Known Member

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                No. Only the sniper. I’ve read a few things people posted on various sites and most did not see a big performance difference on the track. In town though, hot ,cold or whatever it’s been pretty flawless. Ran a 340 with a carb that was pretty dialed in and this is much more consistent.
                 
              • cpearce

                cpearce Well-Known Member

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                Thanks
                 
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