How much power should this make?

Discussion in 'High Performance Modifications' started by Camshaft94, Feb 16, 2017.

  1. Camshaft94

    Camshaft94 Member

    35
    1
    Dec 6, 2016
    Indiana
    You think so? From guys I talked to said I should be okay running 93 with flat tops most people say I should be 9-1 or 10-1
     
  2. 77 cruiser

    77 cruiser Veteran Member

    360
    5
    Nov 17, 2006
    Frostbite Falls MN
    If the heads are 64 cc & you zero deck the block you'll be around 11-1
     
  3. Camshaft94

    Camshaft94 Member

    35
    1
    Dec 6, 2016
    Indiana
    Alright so would I be okay if I get dished pistons
     
  4. Lowend

    Lowend Administrator Staff Member Lifetime Gold Member

    13,684
    86
    Mar 25, 1999
    San Jose, CA, USA
    Not to be harsh, but the bottom line is those heads kinda suck. They are 60+ year old technology (and weren't amazing back than) they are a bottleneck.

    I would not attempt over 10-1 on pump gas with those. A 3.75" stroke on a .030 deck and a flat top piston will put you ~ 10.6-1 compression. That's workable on aluminum heads, and with a large enough cam, some more modern style iron heads, but not double-humps.

    If there is one thing you should splurge on with any motor, it's the cylinder heads.
     
  5. Mwilson

    Mwilson Veteran Member

    those heads are absolutely bottle necks compared to today's technology but I knew plenty of people running them on 400's with 4 valve relief flattops ( 10.7:1?) and smallish comp 280 magnum cams and 2,000'ish stall with 3.42-3.73 gears back in the late 80's & early 90's compression wasn't an issue. I wouldn't hesitate to run flattops at all if I were you. A few years back I ran 2 valve relief flattops in my 408 with 64cc Pro Topline iron heads approximately 11.9:1. I did have appropriate cam/converter & gear. Your definately leaving power on the table with those heads but they will work fine up to 5,800 or so and run anywhere from 11's to 13's depending on what you want to get out of it. Heads are definitely one of the most important factors in determining what you can get out of your motor.
     
  6. larrylarry

    larrylarry Veteran Member

    1,131
    23
    Dec 22, 2011
    San Antonio Tx
    D-dish pistons is not dished pistons if your thinking about buying some.
    Just a bit of advice, find a recipe/ engine build done by someone else that is drive able on the street. Last thing you want is an drag race engine an don't go throwing together a lot of engine parts that don't match up to each other. Also when ever a 383 is being built you have to move up to aftermarket heads. 210-230cc intake runners are a must!! Otherwise the engine can't breath at higher rpms where it wants to start making HP. Performance 350 ci engines want 180-200 cc runners. 383 engines want 210-230 cc runners as a general rule.
    You can look up hotrod.com for 383 engine builds an follow there recipe. One although thing is if your not a real good engine tune guy I'd keep your compression lower like 9.8,10.1 to be on the safe side. Once you get around 10.3-10.5 you have to know what your doing when tuning an engine.
     
    Last edited: Feb 17, 2017
  7. Camshaft94

    Camshaft94 Member

    35
    1
    Dec 6, 2016
    Indiana
    Okay thanks everybody for the replys. I'm not set in a 383 I might just punch it to a 355 and be done. I'm just wanting something to play on the street with reasonable power to have fun.
     
  8. larrylarry

    larrylarry Veteran Member

    1,131
    23
    Dec 22, 2011
    San Antonio Tx
    Mine is a 357 an is plenty fast for my old ass. My brother has a 2014 Porsche 911 which I've driven a few times with him in the pass seat, which is a drag cause I can't thrush the shit out of it, but my 78 Z28 is faster & corners almost as well.
     
  9. Camshaft94

    Camshaft94 Member

    35
    1
    Dec 6, 2016
    Indiana
    You think a 355 with my set would be a good little engine?
     
  10. Rustbucket350

    Rustbucket350 Veteran Member

    744
    6
    Sep 4, 2013
    Oviedo, Florida
    If you're on a tight budget I'd take the money from stroking it and put it into a decent set of heads. Or, you could do the 383 and upgrade the heads later but that's kind of a PITA. You'll gain more bottom end with a 383 and it'll swallow a little more cam, but with that cam you probably wouldn't notice the lack of extra cubes.
     

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