Paging GN 7 (again) BBC/ setup questions
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Paging GN 7 (again) BBC/ setup questions

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    Member TOMSS1's Avatar
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    Default Paging GN 7 (again) BBC/ setup questions

    Bob - I am putting together a 496 for my Hallett 19ss and need some advise on a cam selection / solid roller lifter recommendation and the correct fuel system setup using the Clay Smith pump you have recommended in the past. I have:
    10.2 block 4.25 x 4.310
    8.5 - 1
    Dart 355 heads or Merlin iron 320. (I have both, both done right)
    B & M inter cooled 420
    AED 950 carbs
    Powerglide
    AV gas
    Over the transom headers

    Also trying to figure out what to run for a prop, gear and rudder, boat came with a 11.5 x16 3 blade, 40 gears and a 12 inch long SK style rudder that looks too short to my uneducated eye.

    Boat will be setup with 2 seats and a small bench for lake use,

    Thanks very much for your sound advise.

    Tom

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    Quote Originally Posted by TOMSS1 View Post
    Bob - I am putting together a 496 for my Hallett 19ss and need some advise on a cam selection / solid roller lifter recommendation and the correct fuel system setup using the Clay Smith pump you have recommended in the past. I have:
    10.2 block 4.25 x 4.310
    8.5 - 1
    Dart 355 heads or Merlin iron 320. (I have both, both done right)
    B & M inter cooled 420
    AED 950 carbs
    Powerglide
    AV gas
    Over the transom headers

    Also trying to figure out what to run for a prop, gear and rudder, boat came with a 11.5 x16 3 blade, 40 gears and a 12 inch long SK style rudder that looks too short to my uneducated eye.

    Boat will be setup with 2 seats and a small bench for lake use,

    Thanks very much for your sound advise.

    Tom
    Not going to answer for GN, but I'll throw my .02 in. Use the Merlins. The 355's are WAY too big for the 496. The Merlin's are bigger than they need to be but they'll work. If you have flow numbers, drop me a PM and I can help you with cam and lifters if you want to go solid roller or hyd. roller. Don't really do any flat tappet stuff. You'll want to be sure you have the right springs too.
    Fuel system; run the biggest lines you're comfortable running form the tanks to the pump. From the pump it kind of depends on your fuel lines and carb set up. I'd run a min. -8 line to a regulator, then from there -6 lines to the carbs or -8 to a fuel log and hard lines or whatever you have. There are lots of options on fuel system plumbing but the main thing is to make sure the fuel pump gets as much fuel as possible.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    gn7
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    Quote Originally Posted by TOMSS1 View Post
    Bob - I am putting together a 496 for my Hallett 19ss and need some advise on a cam selection / solid roller lifter recommendation and the correct fuel system setup using the Clay Smith pump you have recommended in the past. I have:
    10.2 block 4.25 x 4.310
    8.5 - 1
    Dart 355 heads or Merlin iron 320. (I have both, both done right)
    B & M inter cooled 420
    AED 950 carbs
    Powerglide
    AV gas
    Over the transom headers

    Also trying to figure out what to run for a prop, gear and rudder, boat came with a 11.5 x16 3 blade, 40 gears and a 12 inch long SK style rudder that looks too short to my uneducated eye.

    Boat will be setup with 2 seats and a small bench for lake use,

    Thanks very much for your sound advise.

    Tom
    I'd run it with what you have now and base the changes off what it tells you. Off hand the gears seem a little too steep. But the trans will help it get moving. But I don't think you have the power to carry the 40s with any RPM. The rudder may work, but my guess is it will what a trailing type cruiser rudder with more blade. The cruiser rudder may have too much blade, and push the nose in when turning, but you can trim it to find the sweet spot. Hard to ass blade to one too small. The prop is a decent starting point. It will probably like a 2 blade better and perform a little better, but it will vibrate a little more than the 3 blade. But the 3 blade is a good starting point while you work out the boat.



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    Quote Originally Posted by steelcomp View Post
    Not going to answer for GN, but I'll throw my .02 in. Use the Merlins. The 355's are WAY too big for the 496. The Merlin's are bigger than they need to be but they'll work. If you have flow numbers, drop me a PM and I can help you with cam and lifters if you want to go solid roller or hyd. roller. Don't really do any flat tappet stuff. You'll want to be sure you have the right springs too.
    Fuel system; run the biggest lines you're comfortable running form the tanks to the pump. From the pump it kind of depends on your fuel lines and carb set up. I'd run a min. -8 line to a regulator, then from there -6 lines to the carbs or -8 to a fuel log and hard lines or whatever you have. There are lots of options on fuel system plumbing but the main thing is to make sure the fuel pump gets as much fuel as possible.
    I have to agree one the heads. I have run the Dart 355 on less engine, but ran a 8-71 and more boost than you be able to run with the 420 and av. Wasn't the best setup, but with the roots and the boost there no lacking from low end. I don't think you can move enough air with the B&M to make the Darts happy. I think with B&M and av the Merlins will work a little better.
    -10 to the pump and -8 to the reg minimum, and make sure the tanks are well vented. The some of the vented flip caps used on some boats don't vent well enough for a blown deal.



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    gn7;2498074]I'd run it with what you have now and base the changes off what it tells you. Off hand the gears seem a little too steep. But the trans will help it get moving. But I don't think you have the power to carry the 40s with any RPM. The rudder may work, but my guess is it will what a trailing type cruiser rudder with more blade. The cruiser rudder may have too much blade, and push the nose in when turning, but you can trim it to find the sweet spot. Hard to ass blade to one too small. The prop is a decent starting point. It will probably like a 2 blade better and perform a little better, but it will vibrate a little more than the 3 blade. But the 3 blade is a good starting point while you work out the boat.[/QUOTE
    What should I do for a cam and what should I run for a regulater with the clay smith fuel pump?

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    Quote Originally Posted by steelcomp View Post
    Not going to answer for GN, but I'll throw my .02 in. Use the Merlins. The 355's are WAY too big for the 496. The Merlin's are bigger than they need to be but they'll work. If you have flow numbers, drop me a PM and I can help you with cam and lifters if you want to go solid roller or hyd. roller. Don't really do any flat tappet stuff. You'll want to be sure you have the right springs too.
    Fuel system; run the biggest lines you're comfortable running form the tanks to the pump. From the pump it kind of depends on your fuel lines and carb set up. I'd run a min. -8 line to a regulator, then from there -6 lines to the carbs or -8 to a fuel log and hard lines or whatever you have. There are lots of options on fuel system plumbing but the main thing is to make sure the fuel pump gets as much fuel as possible.
    Steel - thanks , makes sense, that is what I will use. Bobs points agrees

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    Quote Originally Posted by TOMSS1 View Post
    gn7;2498074]
    What should I do for a cam and what should I run for a regulater with the clay smith fuel pump?
    Big Holley 4 port reg. #12-707

    solid or hyd roller or flat?



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    Quote Originally Posted by gn7 View Post
    Big Holley 4 port reg. #12-707

    solid or hyd roller or flat?
    Solid roller , and who lifters should I buy, On the rudder ? I really want to start with a new one for safety reasons so what should I buy and what length should I start with thanks tom

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    Quote Originally Posted by TOMSS1 View Post
    Solid roller , and who lifters should I buy, On the rudder ? I really want to start with a new one for safety reasons so what should I buy and what length should I start with thanks tom
    I'd get ahold of Cstraub on the cam and lifters.
    I bought my last steel trailing curiser rudder from Glenwood. They had it in stock on the shelf. I'd run as you get it. It will definitely turn the boat better, If it tends to put the nose in too deep when you turn it, let me know and I shoot you a pic of how we trimmed ours.



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    Why ask GN would be my first question.
    Why a 10.2 would be my second.
    OK, just ball bustin.
    Wags

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    Quote Originally Posted by wagspe208 View Post
    Why ask GN would be my first question.
    Why a 10.2 would be my second.
    OK, just ball bustin.
    Wags
    Because its not a hydro, or he would have asked you. I am thinking he didn't want to hear he needed an offset, outboard clamshell deep ass rudder and 2 blade cleaver

    You don't like 10.2 blocks?? Roughly half the engines I have built for the GN were 10.2 blocks with 4.00 cranks
    The one I am currently gathering parts for now is a 10.2 block and a 3.75 stroke. Trying to fool it into thinking its a Ford



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    Last edited by gn7; 08-21-2013 at 01:06 PM.

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    Quote Originally Posted by TOMSS1 View Post
    Solid roller , and who lifters should I buy, On the rudder ? I really want to start with a new one for safety reasons so what should I buy and what length should I start with thanks tom
    PM sent
    Last edited by scott foxwell; 08-21-2013 at 01:23 PM.
    If God is your co-pilot, change seats!
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    Quote Originally Posted by TOMSS1 View Post
    Steel - thanks , makes sense, that is what I will use. Bobs points agrees
    He's listened well over the years.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Quote Originally Posted by gn7 View Post
    I'd get ahold of Cstraub on the cam and lifters.
    I bought my last steel trailing curiser rudder from Glenwood. They had it in stock on the shelf. I'd run as you get it. It will definitely turn the boat better, If it tends to put the nose in too deep when you turn it, let me know and I shoot you a pic of how we trimmed ours.
    This rudder is what size ? They show several, many are bronze so assume steel?

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