Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 
Like Tree7Likes
  • 2 Post By techinspector1
  • 2 Post By rspears
  • 2 Post By jerry clayton
  • 1 Post By pat mccarthy

Thread: 402
          
   
   

Reply To Thread
Results 1 to 5 of 5
  1. #1
    1972chevy is offline CHR Member Visit my Photo Gallery
    Join Date
    Dec 2009
    Location
    Corona
    Car Year, Make, Model: 1964 Chevy El Camino
    Posts
    30

    402

     



    So im looking for some more info, im sticking with building my 396/402 bbc engine. it will be bored out to 4.154 or 4.155, i plan on using Federal Mogul rebuild kit CSMHP716-611 from summit racing, it has Hypereutectic pistons with a -21.00cc dome and a 1.760 comp. distence, COMP Cams Xtreme Energy Retrofit Cam and Lifter Kit K11-413-8 which is 264/270 .510/.510, COMP Cams Magnum Rocker Arm and High Energy Pushrod Kit RPR205. I will be running stock 215 heads they have 98.4cc combustion chamber. So my question now is should i up size the valve size on the heads or leave them stock? Should i use Main and Head studs or just plan bolts? ARP of course. MSD Ignition system with a 6AL box. What size carb should i run? What intake is best? Will be running a 700r4 trans this will be a 4X4 truck running 33 inch tires and more and likely 3.73 gears. Im only looking for around 350-450 HP. Instead of the 500-500 i was before.

    Thanks

  2. #2
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2003
    Location
    Zephyrhills, Florida, USA
    Car Year, Make, Model: '32 Henway
    Posts
    12,423

    If you were running 27" tires, the 3.73 gear would make sense. You are, however, running 33" tires and that will call for a gear around 4.56/4.88 or even shorter if you expect any acceleration at all.

    I'd put hard exhaust seats in the heads an bolt 'em on. Larger valves will require opening up the ports and pretty soon, you'll have more money in them than you wanted to. If you want max flow, buy a set of aftermarket aluminum heads that are ready to go out of the box.

    .
    glennsexton and cffisher like this.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  3. #3
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    Gardner, KS
    Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
    Posts
    10,989

    Tech's on target as usual, with 33's and 3.73's you'll be doing only 1850rpm at 70 running down the road in OD, and your lower gears are going to be anemic. Going to 4.56's you're still only 2262rpm at 70mph, and with 4.88's you'll be turning 2421rpm. You need to look at how you want to use the truck, and pick your gears accordingly but that 700r4 has a 0.696 overdrive in it, so you can afford to go shorter on the gears and give yourself more pulling power, especially if you're wanting to off-road any.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  4. #4
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006
    Location
    Bartlett
    Posts
    6,831

    Be careful with the idea of putting hard seats in any BBC cast iron head as the castings are especially thin around the exhaust valve on the end cylinder that would be for the #7 and #2 cylinder--------------stay with as small as possible seat od--------


    And putting bigger valves in BBC means a bigger notch at the top of your cylinder for clearance

  5. #5
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Apr 2005
    Location
    bay city
    Posts
    10,546

    Quote Originally Posted by 1972chevy View Post
    So im looking for some more info, im sticking with building my 396/402 bbc engine. it will be bored out to 4.154 or 4.155, i plan on using Federal Mogul rebuild kit CSMHP716-611 from summit racing, it has Hypereutectic pistons with a -21.00cc dome and a 1.760 comp. distence, COMP Cams Xtreme Energy Retrofit Cam and Lifter Kit K11-413-8 which is 264/270 .510/.510, COMP Cams Magnum Rocker Arm and High Energy Pushrod Kit RPR205. I will be running stock 215 heads they have 98.4cc combustion chamber. So my question now is should i up size the valve size on the heads or leave them stock? Should i use Main and Head studs or just plan bolts? ARP of course. MSD Ignition system with a 6AL box. What size carb should i run? What intake is best? Will be running a 700r4 trans this will be a 4X4 truck running 33 inch tires and more and likely 3.73 gears. Im only looking for around 350-450 HP. Instead of the 500-500 i was before.

    Thanks
    new head bolts and the stock main cap bolts are fine you can go to 2.190 and 1880 and not do any thing to the deck for cutting and go to a 2.250 intake valve and just clean up the stock eye brows in the deck check the valve relief in the piston but in the small chamber heads may not help you gain much if a lower lift cam with out any work . this is were i go in with the seat and guide machine and profile the chamber for the bigger valves and i go in to the bowls were the cutter.s i use form the 15.30.45.65.70. and on ex side a full radius with a 45 then to 70 after that just some clean up with sanding rolls to drop in the bowl of the head and open up a head for bigger valve i do not charge much more then a valve job is it can go fast with the tobin arp/sunne machine a good set of stainless steel valves 2.065.and 1.720 like PeP jet flow or a back cut stemed down and a nail head ex valve should be ok .if heads have had many valve jobs moving up to a 1800.ex and a 2.190 intake intake side will help put the valve back in the head chamber height and going to a 11/32 valve stem helps flow some . ex side you can put in hard seats your machine shop should know. but like jerry said i only cover the 45 on the Ex on some heads . i use 1 15/16 ex seat if you go to 2.000 bad things can happen on the ex side of the head could go smaller then 1 15/16 if using the stock valve or a 1.800 then you could get away with a 1 7/8 seat
    . many 454 s had 215 o port heads on them fast way to get CR they can be made to work very good . cam watch what year of 396 if you have one. and not a 402 any thing pre 1967 will need number #5 cam journal to be grooved if you want oil to the lifters and top end of engine
    Last edited by pat mccarthy; 11-20-2013 at 07:26 PM.
    glennsexton likes this.
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip

Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink