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Thread: Compression ratio for street truck and general build questions

  1. #26


    98Dak408's Avatar
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    FWIW, I just checked the cc in a new out-of-the-box Eddy 61775 cylinder head and it was 59cc.





    The last head I checked with the valves unshrouded was 61.5cc.
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  2. #27

    Duner's Avatar
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    Nice job!
    Duner
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  3. #28





    slammedR/T's Avatar
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    My heads back in 2006 were 64cc out the box, after larger valves, unshrouding, and cutting them I got the to 59cc

    I think I got them to 59cc, getting old is hell, lol
    Last edited by slammedR/T; 06-14-2018 at 02:09 PM. Reason: old people moment
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  4. #29

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    Just as a frame of reference...

    I have the KB107's and EQ heads. I also went with the Hipotek HPT220X 110 LSA.

    Had to go with the Cometic gaskets (0.051 compressed). I had originally measured .012 out of the hole, but that was with the piston rocked in the bore. Numbers were more like .005 out of the hole on the quench side. The dynamic compression is 10.2 on the KB calculator. I just got it running - backfires out of the intake/TB. Waiting on a tuner from FRP. Hopefully here by the end of the week.

    The crazy felpros were 4.180 bore! Couldn't go with the felpro race gasket - too thin. The other felpros are pure headache - they all vary in thickness!
    2001 Dakota R/T, Standard Cab...the Rat Roaster!

  5. #30

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    Reviving this thread because I managed to get my hands on a good deal for eddys/comp 1.6 rockers/lifters/pushrods. I also bought an M1 2bbl and a cam a couple months ago so the parts are stacking up. Cam is Crane OPHY2634-10+1, 226/234 @.050 .552/.544 lift 110 LSA.

    I ditched the whole machining idea and am now looking at Icon 741 forged pistons which should be drop in with the same weight as stock pistons but give me zero deck (same compression height as the KB107s) so no balancing required. Seems like a solid plan to me.

    Assuming zero deck with those pistons and a 59cc chamber on the heads, perfect world would be Fel Pro 1008 gaskets to give me perfect quench and put me at a hair over 11.1 compression, dynamic compression 9.3 as that cam has a good amount of overlap. We'll see where the deck comes out to once the short block is assembled and I'll make my gasket choice then.

    -Justin

  6. #31



    99dart's Avatar
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    Good to read you are moving ahead on the build! If my son has his engine bay painted and ready, I will be helping him get his engine installed here in 3 weeks or so.
    p.s. My son & I both ran into bad rocker arm geometry. It turned out our pushrod guides were too thick. He found these thinner pieces and ordered them. It brought alignment back into place, so I bought a set as well. With the Eddy heads it may not be an issue, but wanted to give you a "heads-up".
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  7. #32

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    my 360 in my duster is 11:1 and i run pump 91....8 years now no issues...its all in cam and tuning...im fuel injected with eddy heads
    Be yourself, everyone else is already taken

  8. #33

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    Quote Originally Posted by JamesEcker View Post
    my 360 in my duster is 11:1 and i run pump 91....8 years now no issues...its all in cam and tuning...im fuel injected with eddy heads
    Definitely not worried about the high static compression anymore as I know this cam is going to bleed a good bit off anyways.

    Waiting on Ryan's input on compression / how big of a throttle body I need.

    -Justin

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