Sbc recipes
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Sbc recipes

  1. #1
    cb1
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    Default Sbc recipes

    Anyone have some reccomendations for a twin stern drive setup staying with iron heads. looking for cam intake and carb sugestions

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    cfm
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    Pretty easy:
    Holley 600/650 or Edelbrock 600
    Performer RPM or RPM Air Gap (GM Bowtie if you want cast iron)
    Comp XM262H hydraulic or XM270HR if hydraulic roller

    Wallah.

    Note: if you have twins, there is a slight chance your motors already have the highrise GM bowtie intake which is just as good as the Performer RPM intakes.

    What years are your engines ? They may have blocks ready for HR cams making the switch over easy. If they are new enough, they may have Vortec heads and HR cams already.

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    cb1
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    89 with bravos i think the intakes are iron though going to tear down next weekend have about 600 hrs on them wanted to warm them up a little what kind of H.P. with combo you think?

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  6. #4
    cb1
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    Would it help to use a carb spacer with that manifold or modify by lowering that divider between the 2 plenum,s

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    cfm
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    Usually the Bravo equipped small blocks came with the Bowtie High Rise Cast iron intake. Look for the Bowtie cast into just behind the carb, up on the carb pad. This intake kicks ass - no reason to change unless looking to save weight (aluminum) or they are rotted out.

    Look for 310-320 or so hp with parts I've mentioned. You'd need better heads to up the power from there.

    When you tear down the engine check to see if your block is set-up for accepting factory hydraulic roller cams. If it is, I'd go this route. Pretty cheap to go HR if yoou use the factory parts - lifters, spider and dog bones, cam retaining plate, etc.

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    cfm
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    Quote Originally Posted by cb1 View Post
    Would it help to use a carb spacer with that manifold or modify by lowering that divider between the 2 plenum,s
    Not with this build.

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    A pair of 383's would wake the engine compartment up.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    cb1
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    Thanks cfm looking to tear down in the next 2 weeks i will see if i can get more info then thanks for the replys

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    cb1
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    Chris i hear you are the man of cams any input on a na 350?

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    Quote Originally Posted by cb1 View Post
    Chris i hear you are the man of cams any input on a na 350?
    Bang for the buck I would add CID to the boat. 2 383's even with OEM heads are better recipes for a boat as you let the CID make the power, not rpms and in doing so keep the rpms low which long term makes for less maintenance.

    Pair a couple of rotating kits with a mild hyd roller and some bowl hog work and 202/1.6 valves in the OEM heads you would have a nice pair of 375HP engines and be knocking on 400#/ft of torque.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    cfm
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    Quote Originally Posted by cb1 View Post
    Anyone have some reccomendations for a twin stern drive setup staying with iron heads. looking for cam intake and carb sugestions
    Quote Originally Posted by cstraub View Post
    A pair of 383's would wake the engine compartment up.
    Quote Originally Posted by cb1 View Post
    Chris i hear you are the man of cams any input on a na 350?
    Quote Originally Posted by cstraub View Post
    Bang for the buck I would add CID to the boat. 2 383's even with OEM heads are better recipes for a boat as you let the CID make the power, not rpms and in doing so keep the rpms low which long term makes for less maintenance.

    Pair a couple of rotating kits with a mild hyd roller and some bowl hog work and 202/1.6 valves in the OEM heads you would have a nice pair of 375HP engines and be knocking on 400#/ft of torque.
    What carbs, intakes, and cams would you use on his 350's ?

  14. #12
    cb1
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    I really am thinking of 383's since you brought it up

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    cfm
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    Quote Originally Posted by cstraub View Post
    and some bowl hog work and 202/1.6 valves in the OEM heads you would have a nice pair of 375HP engines and be knocking on 400#/ft of torque.
    What would be the cost difference of refreshing his heads, adding larger valves, springs, etc, etc vs just buying say a set of Vortec's with a better spring/stud package installed ?

  16. #14
    cb1
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    very good question where would i start to look for vused vortec heads

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