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Technical A 265 Chevy build with a cool story

Discussion in 'Traditional Hot Rods' started by bfalfa55, Jul 23, 2013.

  1. dblgun
    Joined: Oct 24, 2009
    Posts: 348

    dblgun
    Member

    I am for sure to an engine guru but if your setup ends up needing it I have used/use GM .016-.018 shim gaskets with aluminum heads and have had no issues with them. Make sure that everything is flat, use good fasteners and make sure of your torque values. It will depend on where you end up with deck, piston/head clearance and all the other things you will want to consider to maximize quench while avoiding "things" getting together. You can get MLS gaskets from Cometic and others that come in around .025-.027, I have used hem also and they are nice, I also think the fire ring is fine at the edge of the bore as long as there is not overhang and obviously as long as you get a good seal. I would like to see a picture once you have time to post one to see exactly what you're dealing with.
     
    loudbang likes this.
  2. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    Hey dblgun, look back in this thread on PAGE 7 in about the middle of it, I have pictures (the first one is probably best) posted where you can see how the tops of the bores were modified.
     
  3. Gary Addcox
    Joined: Aug 28, 2009
    Posts: 2,350

    Gary Addcox
    ALLIANCE MEMBER

    Man, you and your Son are so lucky to have your Father/Grandfather to not only offer advice but help with your builds. Hang in there, guys ! I am reliving the "good old days" when the 265-283 were kings. They still are to me.
     
    loudbang likes this.
  4. dblgun
    Joined: Oct 24, 2009
    Posts: 348

    dblgun
    Member

    Yeah bfalfa I remember the photos you posted then, I was wondering about photos where the gaskets you were speaking of are shown on the block.
     
  5. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    I reordered my gaskets and will have to run a 4.125 bore, .039 gasket. This will give me a .054 quench and 10.15:1 comp. Taking .010 more off the block will put me at .044 and right about 10.5:1. I don't know if doing that is worth it or not for the effort. Thoughts ?
     
    loudbang likes this.
  6. dblgun
    Joined: Oct 24, 2009
    Posts: 348

    dblgun
    Member

    If you're certain about those compression figures, make sure to take the camshaft's effect on dynamic compression into consideration.
     
  7. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    I will most likely be choosing from some other cams because I think the lift the first Lunati rep recommended won't give em enough valve to piston clearance. The other 2 I am looking at have a calculated 8.41 or an 8.71 dynamic compression ratio. Do you think it is still safe enough with the 8.71 running 93 pump gas ?
     
  8. dblgun
    Joined: Oct 24, 2009
    Posts: 348

    dblgun
    Member

    Common reasoning is that greater than 9:1 dynamic compression ratios are normally race engine territory. Obviously like so many other things with cars and engines there many opinions which are based on what you are willing to do/put up with. I believe that your plan is to run aluminum heads with a more modern design combustion chamber which should allow you to run more compression. Maximizing quench will also make your engine more compression tolerant. As you already know the more compression you can get in that little engine the better. In my opinion you can run the dynamic compression at 8.71 and with the proper tune and fuel mix you should be able to make it work fine.
     
    loudbang likes this.
  9. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    Thanks dblgun. I was thinking much the same, it's just good to hear it from others who have knowledge and know the little engine has to be approached different and a little more precise with the right combo of parts!
     
  10. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    Based on where my cam RPM range is 2,300-6,300 RPM, .218/.228 duration @ .050, .503/.503 lift. 112 LSA hydraulic roller, do any of you think I will benefit from an X pipe or an H pipe in my 2 1/4 inch exhaust system ? I read some conflicting information as to how it may benefit or hurt my little 265. I would like to hear your suggestions or if you think it isn't worth the effort at all.
     
  11. sololobo
    Joined: Aug 23, 2006
    Posts: 8,117

    sololobo
    Member

    what a cool info load in this thread, love the 17 year old being interested in the build. I went with my my brother to pick up a super clean little 265 last year, it is lurking in the corner of his garage wanting to run again, it will. All this info is super. Thanx to all sololobo
     
  12. sololobo
    Joined: Aug 23, 2006
    Posts: 8,117

    sololobo
    Member

    again I must say this great thread has more info than google!!
     
  13. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    Yes it does and you can thank all on the HAMB for their input. Unfortunately, I have made this a long, drawn out affair but it probably has allowed every question and answer someone could need or want to build a 265 or even a 283 get asked.
     
    504640 likes this.
  14. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,896

    Roothawg
    Member

    So, whatever happened? Did we build said 265?
     
  15. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    Not yet, I am the ultimate procrastinator ! I think about it too much and second and triple guess myself. I have just been enjoying my 55. I do plan on doing it this summer. It's actually been tough trying to find a machine shop that will even touch it believe it or not. Most seem afraid to touch it!
     
  16. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,896

    Roothawg
    Member

    Wow, its just a sbc, nothing too different.
     
  17. 427 sleeper
    Joined: Mar 8, 2017
    Posts: 1,067

    427 sleeper
    ALLIANCE MEMBER

    If a machine shop won't do that, you're at the wrong shop.

    Sent from my SM-G892A using The H.A.M.B. mobile app
     
  18. bfalfa55
    Joined: Jul 23, 2013
    Posts: 223

    bfalfa55
    Member

    I know Roothawg, I said the same thing it's just an sbc. 427 sleeper, that's why it isn't at any of those shops. I throw most of them for a loop when I talk about pulling the rear cam bearing to modify the oiling. Most have zero clue what I am talking about. I also find most want to do a complete rebuild and this doesn't need it. It's already been tanked, bored and balanced. Seems like they want to make their top dollar not just a little money for the things I want done.
     

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