So back me up on my new motor plans

Discussion in 'High Performance Modifications' started by blake22, Mar 18, 2013.

  1. blake22

    blake22 Veteran Member

    264
    0
    Aug 20, 2009
    Cleburne Texas
    Im about to start building the new motor for my 79. The block and crank are at the machine shop getting bored and turned. heres my set up

    .030 over 010 350 block
    cast crank 10/10
    stock rods
    Dont have pistons yet but im looking at some -3.5cc speed pro hypers
    trick flow 195cc 2.02 1.60 72cc chambers
    with summits compression calculator i came up with 9.41:1 comp
    intake? dont have yet but maybe air gap or the like
    shorty headers to 3in dronemasters dumped

    Ive been reading around and have my eye on a few cams but i would like to get a second opinion from yall before i order. This is my "daily" really a street strip car. The cam i was looking at is 288/298 214/224@.050 .443/.465 lift and 112lca. Would that be a good choice or should i go a step or two up?
     
  2. hhott71

    hhott71 Veteran Member Lifetime Gold Member

    14,373
    0
    Mar 30, 2001
    Joplin Mo. 64801
    Part number of the -3.5cc Speed Pro piston.
    Is this a flat top piston?
    Or a 0.100" dome piston?

    Flat tops with 64cc chambers is always 10-10.25:1 compression.
    The 0.100 dome makes it 11:1 compression w/64cc chambers.

    The 72cc will get you that 9.4 comp w/ flat tops.

    Get the 64cc chambers if you can, that extra compression is worth it since you will use premium gas anyway.

    Your cam is OK, a bit mild. But great for the street, decent MPG, some rumble and more HP/TQ than stock.
    Get real full length 1.625" Hedman Hedders and 2.5" exhaust, H pipr Turbo mufflers, tailpipes optional. You are not going to make power above 5000-5500 rpm with that cam, so make torque with complimentry parts. The Performer Intake is what you need and a QJet or 600 cfm Holley or Edelbrock AFB.
    Get a 11" 2500 rpm stall, and 3.42 gears. OR 4.10 gears with an OD transmission. That will add 100 butt dyno HP.

    The Carb and Intake can get swapped (and sold) later IF you get aggressive with the cam, converter and rear gears.
     
    Last edited: Mar 18, 2013
  3. blake22

    blake22 Veteran Member

    264
    0
    Aug 20, 2009
    Cleburne Texas
    Im asking what cam to get so i can do it right the first time and make a good chunk of power. Im not looking for near stock. I want to do the best with the parts i already have. Like the heads. I already have them and thats what they are because i got a good deal on them. I already have 3.42 gears and i like my headers. I have read everyone talking about shorty vs long tube but i picked shorty because of clearance. Anyways i thought the cam selection was rather small too so the next step up that i see is maybe 282/294 216/228 @.050 .435/.480 lift 112lca. This a little beefier? Im looking at elgin cams right now. I have used them in the past and had good luck.
    The pistons im looking at are here http://www.ebay.com/itm/SB-Chevy-35...Parts_Accessories&hash=item589aed666a&vxp=mtr
    The head gasket i used for the calculation was .041 compressed and a 4.166 bore dia. Also i used a deck clearance of .045. Is that about right?
     
  4. blake22

    blake22 Veteran Member

    264
    0
    Aug 20, 2009
    Cleburne Texas
    So basicly what im saying is lets go aggressive with the cam now:cool:
     
  5. 1971SS

    1971SS Veteran Member

    732
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    Feb 5, 2011
    eastern NC
    with what you have, I'd go with Howards Cams 110991-08, 275/275 221/221 @ 50 .470/.470 lift 108 LSA ...a weiand street warrior intake and a 2000-2500 stall converter...

    if I were planning on say, atleast 3:73's at a later date, I'd go with Howards Cams 110951-08, 275/285 221/231@50 .470/.470 lift 108 LSA...same intake but go at least 2500 stall...
     
    Last edited: Mar 18, 2013
  6. Madmike72

    Madmike72 Veteran Member

    231
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    Nov 26, 2010
    Walpole Massachusetts
    Trick Flow has top end kits. Check and see what cam they match with your heads and use that as a referance point. they will prob recomend something on the larger size for the rest of your combo (3.42=mild) but its a
     
  7. Madmike72

    Madmike72 Veteran Member

    231
    0
    Nov 26, 2010
    Walpole Massachusetts
    whoops...its a good starting point
     
  8. hhott71

    hhott71 Veteran Member Lifetime Gold Member

    14,373
    0
    Mar 30, 2001
    Joplin Mo. 64801
    The 216* cam will add a few more HP but you are limited by the low compression that you have.

    You better have 0.025" deck height. You should use the Felpro 1094 0.015" thick gaskets. You have to have 0.35-.050" quench, the 1094 gaskets give you 0.040" Chevy used embossed steel shim gaskets (like the 1094's) for decades on the SBC. The composite gaskets are NOT an improvement. IF you deck the block 0.025" those Blue rebuilder 0.41" gaskets will be OK. It's cheaper to buy the 1094's.

    The proper quench allows higher compression.

    The 0.100" domes those ebay pistons have should give you about 10 to 10.4:1 with the proper 0.040" quench and your 72cc heads.
    You could step up to a cam with 230* Intake duration. Add in a 10" TCI Super Streetfighter converter.
    Yes its about $500 but it does kick ass.
    The Crane 284 Energizer it is .480" lift, 228* Dur, 112* LC, you can get this cam with 106* LC and it will be a rougher idling cam with a strong midrange torque, also availaable with 110* LC.
    I went low to mid 11's with a 10:1 motor and that cam in a 2800lb Vega, a 3300 lb Camaro would go 11.60-11.80 with a decent chassis.
     
  9. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

    8,699
    0
    Sep 20, 2004
    Southern Maryland
    aftermarket heads and such a small cam is a waste of good heads. I won't pick a specific cam b/c everyone has a different idea of what is correct but if you have such good heads and run much under .500 lift you are just leaving so much on the table
     
  10. 76z28

    76z28 Veteran Member

    1,633
    0
    Jun 29, 2009
    bakersfield
    I would get something in between the xe268/274. Pretty much my set up minus the compression(I'm around 10.5:1) and mine will lay rubber all day but I do have 3.73s and a 3500 stall
     

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