416 heads on a 350??

Discussion in 'Engine Topic' started by crailbait, Mar 19, 2006.

  1. crailbait

    crailbait Veteran Member Lifetime Gold Member

    I was wondering if anyone has ever used casting # 416 heads (58cc 1.84/1.5) on a 350 engine? What are the pros and cons of using such heads? Lets just say the engine is bored 30 over...Thanks!

    Jeff C.
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

    Nov 4, 2004
    Ringgold, GA
    According to http://www.mortec.com/ these are - 14014416...80-86...305..........1.84"/1.5" valves, 58cc chambers. Most people tend to shy away from 305 heads for a couple of reasons. One is the 58cc chamber which is going to raise the compression ratio considerably and the small valves and runners which will run out of breath pretty quick. Some are proponents of these little heads, I'm not. If they are in good shape, ie; you don't have to spend any money on them for a rebuild and you are on a very tight budget, put some thick head gaskets on and use them. If you can afford something else, don't even consider the 416's. IMHO
  3. crailbait

    crailbait Veteran Member Lifetime Gold Member

    I have a 305 in the car right now and bought the heads for the 305 as an upgrade. They are completely redone and ready to bolt on. i just found/bought a 350 engine for my car which matches up for my 71 Camaro. FYI - I bought the car with the 305 in it already. I didnt find out until later it was a 305..Guy that sold me the car stated it was a 350.) But anyways, i found the right engine and since i have the heads was wondering if i could use those to save on some money?? How thick of a gasket should i use i do decide to use them? How high of a compression ratio could i expect??

    Jeff C.
    Last edited: Mar 19, 2006
  4. Mwilson

    Mwilson Veteran Member

    If its a typical Flattop piston with .025 in the hole, -6cc valve reliefs youd be at 11.02:1 with a .015 gasket. What cam converter gear you plan to use? A .039 will give you bad quench but put you at 10.32:1
  5. 1978LT

    1978LT Veteran Member

    Feb 24, 2002
    Poquoson, VA USA
    The 416 heads make for a torquey 350! Ask PDQ67, he loves them.
    Last edited: Mar 20, 2006
  6. classicz28

    classicz28 Veteran Member

    Feb 4, 2002
    longwood, fl, usa
    I did the other stupid thing... Put 350 76cc heads on a 305. Almost no compression and no power. Ran ok though...just no power....
  7. pdq67

    pdq67 BANNED

    Jul 26, 2001
    Columbia, MO, USA
    The -416's are more smog shaped likw W/P's Torquers whereas the -601's are double-quenched and shaped a whole lot like the old -461 double-hump fuelie heads!

    Both good heads, but I lean towards the -601's.

    And cc them regardless so you know exactly how big their chambers are!!

    They both should have about 160 cc intake ports!! (At least my -601's do along with 53 to 55 cc chambers.)...

    Great heads for the smaller motors, imho.. I think the roundy-round guys put an 1/8" to a 1/4" bullnose around the chamber outlines to open them up some for 350 motor use. It also makes them flow some better too.

  8. 1978LT

    1978LT Veteran Member

    Feb 24, 2002
    Poquoson, VA USA
    Also, we built a 350 with -434 305 heads, and it would totally roast the tires with the 1.72/1.45 valves!
  9. 1978LT

    1978LT Veteran Member

    Feb 24, 2002
    Poquoson, VA USA
    That's the first stupid car thing I did also!! Had like 120 psi cranking pressure!! That equals about 6.0 or 7.0 compression. :crazy: :eek:
  10. caribbean camaro

    caribbean camaro Veteran Member

    Sep 1, 2002
    Antigua (via Florida)
    Crailbait - I am in the same boat as you - my 85 camaro original 305 was my first venture into hot rodding

    I did the heads over with new springs, seals, a valve grind job, long slot rockers, 214/224 443./.465 cam - 114 lobe- flattop pistons

    I soon got the bug and found that the 305 was just not cutting it & pulled the motor for my current 355ci

    Now I am building up a budget hot street 350 .030 over for another car - and with all the goodies on the 305 heads- I plan to use them

    MWILSON however has raised some issues for me -

    "If its a typical Flattop piston with .025 in the hole, -6cc valve reliefs
    youd be at 11.02:1 with a .015 gasket."

    Are you sure that all I would need is H345NP flatop pistons (which I have) assuming a stock .025 in the hole to be near to 11:1 ???? I already have the 0.15 shim Fel Pro gaskets

    Not doubting you MWILSON - but I have found that in practical terms - when you are just assembling parts as in budget builds - these assumptions about increasing compression don't always play out the way they are supposed to on paper - mainly because of all the variations in stock blocks and heads -

    I was actually planning to use a set of used L2304 - .100" pop up pistons to ensure that I do not miss the near 11:1 mark for the 214/224 cam I plan to use

    I personally think the 305 head on a .030 block will be a good street motor - and I intend to pursue it - as long as I can figure out if the compression will be up to snuff for my cam

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