427 Tall Deck questions
+ Reply to Thread
Results 1 to 11 of 11

Thread:
427 Tall Deck questions

  1. #1
    Senior Member
    Join Date
    Aug 2012
    Posts
    187

    Default 427 Tall Deck questions

    Spent some time in the search function and couldn't find a definitive answer on a couple of potential issues. I injured my 454 engine (Jet), it's out of commission for a few months. Located a 427 TD for cheap, thinking about popping it in if I can get it to work without too much trouble. It's sitting in a farm vehicle and starts up so easy and sounds very good, not even a hint of exhaust smoke.

    My first question is this: Will this stock 427 get my heavy jet on plane? I was turning the 454 @4,200 rpm. I don't have a clue what kind of rpm to expect with a torque monster, low hp piece.

    The 427 has a flywheel (454 has flex plate): What's the work around? Can I put a flex plate on this 427 and keep the engine balanced properly? Does internal/external balance factor into the equation? It's my understanding that the tall decks are internally balanced? If I'm forced to keep the flywheel, will I'll need a shorter u-joint or PTO adapter?

    Damn, the factory intake manifold is problematic on the 427 in that it has the double thermostat deal and some other funky crap. Any way to side step that housing and go with a traditional 454 water divider/housing?

    Since the block is +.400, will it be trouble connecting my exhaust tubing without relocating exhaust tips?

    I'm not crazy about this idea and to be honest, I'm ok with sitting out the summer. However, I feel obligated to my kids to get them back out there if can be done relatively easy.

    I have no intentions of using the Tall Deck once my 454 is ready, that's why I don't want to waste time swapping out the intake, getting spacers, slip collar distributor, etc, etc. I can get the 427 cheap enough to break even parting it out so I'd rather not molest it too bad.
    Seller priced it thinking is was a 366 and even after helping him determine is was a 427 TD he agreed to sell it low.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    Dec 2007
    Location
    Iuka, Mississippi 38852
    Posts
    598

    Default

    427 truck engine? If so, walk (run) away unless you purchase a new complete rotating assembly. You will not be satisfied with its poor performance.

  4. #3
    Senior Member
    Join Date
    Aug 2012
    Posts
    187

    Default

    Quote Originally Posted by Richard Till View Post
    427 truck engine? If so, walk (run) away unless you purchase a new complete rotating assembly. You will not be satisfied with its poor performance.
    Agree, seems to be the consensus, thought about using it for a future stroker motor but I'd be money ahead buying a crate engine. Thanks for replying.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member
    Join Date
    Aug 2012
    Posts
    187

    Default

    As I poured through the search function and viewed thread after thread regarding 427 tall decks, it became quite apparent that one member had spent a lot of time with them. It was his advice that brought this idea to a screeching halt. Posthumously, thank you GN7. A couple of years have gone by since his passing however, he is still giving.

  7. #5
    Senior Member
    Join Date
    Dec 2008
    Location
    Sacramento area
    Posts
    1,131

    Default

    Should be little to no issue switching blocks (complete engines). Flywheel is not an issue, just used for the ring gear to starter. Leave it there.
    The only issue I see is if the 427 has peanut port heads? Maybe just switch your 454 heads on the 427. Casting number on the heads should tell you what they are. The last TD 427 I had, came with oval port open chamber heads, should work well.
    It will run your boat on plane. Tune up your pump, that will help with your performance the most with any engine combo.
    Good luck,
    Be safe, schick
    Last edited by schick; 07-16-2017 at 06:40 AM.
    Half the people in the world are below average.

  8. #6
    Senior Member
    Join Date
    Dec 2007
    Location
    Iuka, Mississippi 38852
    Posts
    598

    Default

    It won`t run very well with the best heads money can buy. The pistons with 4 rings each weigh a ton.

  9. #7
    Senior Member
    Join Date
    Dec 2008
    Location
    Sacramento area
    Posts
    1,131

    Default

    Quote Originally Posted by Richard Till View Post
    It won`t run very well with the best heads money can buy. The pistons with 4 rings each weigh a ton.

    "My first question is this: Will this stock 427 get my heavy jet on plane? I was turning the 454 @4,200 rpm. I don't have a clue what kind of rpm to expect with a torque monster, low hp piece. "

    At 4200 rpm how detrimental can an extra ring be? He said he wants to go boating. Buy some points and go. What can it hurt? Engines are like guns and tools. If you can buy them cheap, buy them. I don't care how many you have. You always can use more.

    Be safe, schick
    Last edited by schick; 07-17-2017 at 12:15 PM.
    Half the people in the world are below average.

  10. #8
    Off Road Badass Bonzen's Avatar
    Join Date
    Apr 2012
    Location
    San Diego
    Posts
    267

    Default

    Quote Originally Posted by schick View Post
    "My first question is this: Will this stock 427 get my heavy jet on plane? I was turning the 454 @4,200 rpm. I don't have a clue what kind of rpm to expect with a torque monster, low hp piece. "

    At 4200 rpm how detrimental can an extra ring be? He said he wants to go boating. Buy some points and go. What can it hurt? Engines are like guns and tools. If you can buy them cheap, buy them. I don't care how many you have. You always can use more.

    Be safe, schick
    Good philosophy

    Peanut Port heads aren't "great" I agree. But I am getting just over 5K rpm out of mine turning an A impeller at 55-60 GPS and they are bone stock except for Trick Flow pushrods and Comp Cams dual valve springs. So they do work, but you will never get high rpm out of them.
    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7

  11. #9
    Senior Member
    Join Date
    Dec 2008
    Location
    Sacramento area
    Posts
    1,131

    Default

    Quote Originally Posted by Bonzen View Post
    Good philosophy

    Peanut Port heads aren't "great" I agree. But I am getting just over 5K rpm out of mine turning an A impeller at 55-60 GPS and they are bone stock except for Trick Flow pushrods and Comp Cams dual valve springs. So they do work, but you will never get high rpm out of them.
    And there it is, go have some fun.

    Be safe, schick
    Half the people in the world are below average.

  12. #10
    Senior Member
    Join Date
    Aug 2012
    Posts
    187

    Default

    I'd honestly give it try just for grins but I can't solve the intake manifold water divider problem, the tall decks have a dual thermostat. I was considering this just to get out for a month or two, doesn't make sense to throw an aftermarket intake on it. I did buy the engine though!

  13. #11
    Senior Member
    Join Date
    Dec 2008
    Location
    Sacramento area
    Posts
    1,131

    Default

    ∆∆∆∆∆∆∆ plug the thermostat, one of them (plate over it). Run a pressure regulator from the pump ( which I recommend anyway) to the water heater location/holes, from the thermostat housing to the OTs, and overboard. I would bet the TD manifold would work as it sits? Might look like shit, but would work. Just my thoughts.
    Congrats on the new purchase.
    "One is too many, and a thousand is not enough".

    Be safe, schick
    Half the people in the world are below average.

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95