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Thread: Advice on cam profile selection.

  1. #1

    Default Advice on cam profile selection.

    Hi. I'm awaiting the arrival of my unit and had a general question on what cam profile I should choose as I'm setting up. The engine is a SBF 421 based on a 351W platform. Thank you for any recommendations or advice.
    I have a Comp Cam with the following specs:
    Comp 35-000-8RF
    FW 3113B/3170B HR 110°+4
    Gross Valve Lift .587"/.577"
    Duration 304°/315°

    Cam Installed:
    Duration 242°/248°
    Lobe Lift .367"/.361"
    Lobe Separation 110°

  2. #2

    Default

    I could be wrong, but I think it depends more on how much vacuum you have at idle with the cam, than cam specs. I have a 351 Windsor with a 289 style cam, and it pulls about 7-8 inHg of vacuum at idle. I went with the "race cam". I'm not really sure what vacuum readings would indicate what setting to use. Also, look at what the RPM range for your cam is. Mine is 4000 to 7000 (obvious race cam).

  3. #3

    Default

    So what vacuum specs would correlate to which profile?

  4. #4
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    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  5. #5

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    So my idle probably won't be good, is that what I'm gathering from that thread you linked?
    My question still wasn't answered, however, what cam profile would you recommend I select to start?

  6. #6
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    Default

    Quote Originally Posted by donkeykong View Post
    So my idle probably won't be good, is that what I'm gathering from that thread you linked?
    No, it means a large radical camshaft will require manual tuning of the idle area. It will still idle fine.

    My question still wasn't answered, however, what cam profile would you recommend I select to start?
    I can't answer that. Just tell us which camshaft you plan on using.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  7. #7

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    It's the cam with specs that I outlined in my first post.

  8. #8
    Join Date
    Dec 2009
    Location
    Connecticut
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    You shouldn't have any problem with that camshaft, and you'll probably be able to idle in Closed Loop.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  9. #9

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    Quote Originally Posted by Danny Cabral View Post
    You shouldn't have any problem with that camshaft, and you'll probably be able to idle in Closed Loop.
    I appreciate the response Danny, thank you!

  10. #10

    Default

    Quote Originally Posted by donkeykong View Post
    Hi. I'm awaiting the arrival of my unit and had a general question on what cam profile I should choose as I'm setting up. The engine is a SBF 421 based on a 351W platform. Thank you for any recommendations or advice.
    I have a Comp Cam with the following specs:
    Comp 35-000-8RF
    FW 3113B/3170B HR 110°+4
    Gross Valve Lift .587"/.577"
    Duration 304°/315°

    Cam Installed:
    Duration 242°/248°
    Lobe Lift .367"/.361"
    Lobe Separation 110°
    I have a Straub cam in my 468, 229°/241° & .620"/.580", LSA 109°, intake vacuum 13 inHg at idle, it runs like a dream with EFI, much better than the old carb.
    And I get 16 MPG/highway, that's truly amazing!!!

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