409 SBC: Help with picking heads?

Discussion in 'High Performance Modifications' started by czizza, Nov 22, 2017.

  1. czizza

    czizza Veteran Member

    793
    10
    Jan 8, 2004
    N. Massapequa, NY, USA
    Hey guys,

    I am thinking of swapping the heads on my 409 right now I have the following:

    DART SHP 400 Short Block Kit
    -Bore Block to 4.165

    Eagle Assembly 409CID 10.9:1 Bore 4.165
    -Crank 4340 Forged Steel Crankshaft - 3.750
    -Rods 4340 steel 6.000 inch H-Beam
    -Mahle Forged 4032 .040 -5cc
    -Plasma-moly file fit ring set
    -ACL/Clevite77 or King rod and main bearing set
    -Compression 66cc = 10.79:1

    Edlebrock Pro-Jection EFI kit
    Edelbrock RPM Aluminum Heads (Original 6089)
    Scorpion Roller Rockers 1.6 7/16 studs
    Cometic MLS Head Gasket .040
    Comp Cams Custom Hydraulic Roller Cam Based
    -08-433-8 XR288HR ground on 112 Center Line

    I port and polished my heads and Victor Jr. manifold and I have about 178cc ports on the intake. When I run the chassis dyno I am at 433 at the wheels and over 400lbs from 3200 to 6000rpm.

    I know the heads are a restriction because when I built the motor I had the original injectors in the car 24lbs and had to add about 20% of fuel to all grids ... I then upgrade to 45lbs injectors and during the tuning I had to cut about 20~30% fuel in all the grids to get it to run.

    Now I am running 34lbs injectors and still have to remove fuel around 10% at 6 & 7k so this means I do not have enough air to support my engine. I am guessing this is like a big restrictor plate similar to what NASCAR does.

    Here is my engine's numbers:
    [​IMG]

    I am thinking something in the 220~230 range. My car weighs 3995 with me in it.
     
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

    8,871
    142
    Nov 4, 2004
    Ringgold, GA
    Profiler heads seem to be the bang for the buck in that range. There are several companies that have their own version machined to their own specs. You can give Brandon at ATK a call, he'll help you out.

    I have that same Eddy head on my 355 and ran a 6.96 in the 1/8th. They're a capable head but I agree, you need to step up a bit.
     
    SRGN likes this.
  3. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    14,145
    173
    Mar 25, 1999
    San Jose, CA, USA
  4. RS1979

    RS1979 Veteran Member Lifetime Gold Member

    2,571
    237
    Jun 18, 2013
    Memphis, TN
    I've got AFR heads on mine. Best investment I've made in my car.
     
  5. Damon

    Damon Veteran Member

    12,927
    15
    Nov 16, 2000
    Philly area
    AFRs have made power for me on every engine I've ever bolted them on top of. I consider the 195cc versions to be "entry level" on a 400ci small block.
     
  6. czizza

    czizza Veteran Member

    793
    10
    Jan 8, 2004
    N. Massapequa, NY, USA
    I spoke to AFR and they said go with 210 if I stay hydraulic or go with 220 if I decide to go solid ... I can mill them to 58cc from the 64cc I already have to bump my CR to 11ish:1 ... this will be a 50~75HP gain maybe 100hp but that is hard unless I am really restricted.

    Thoughts?
     
  7. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    14,145
    173
    Mar 25, 1999
    San Jose, CA, USA
    The 220's use some odd (expensive) valvetrain stuff I'd stay away with your project. I remember something about offset rocker arms and such. ....It's been awhile.
     
  8. RS1979

    RS1979 Veteran Member Lifetime Gold Member

    2,571
    237
    Jun 18, 2013
    Memphis, TN
    The 210cc heads should work for you.
     
  9. $ Mike 70 Z-28

    $ Mike 70 Z-28 Veteran Member

    850
    6
    Nov 7, 2002
    New York, NY
    The 220 head you can use reg. rockers from the 227 and up is with shaft rockers
     
  10. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    14,145
    173
    Mar 25, 1999
    San Jose, CA, USA
    Are you saying this from experience or from reading the catalog? I'm remembering someone had a bunch of issues with 220 cc AFR's. I could be mixing it up with the 227's, but I'm usually pretty good at remembering this stuff.
     

Share This Page