Few bbc questions
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Few bbc questions

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    Senior Member schiada flatty's Avatar
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    Default Few bbc questions

    Just took apart my 427 too find out if I had a head gasket leak and sure enough I did. But that's not all I found. Time for new pistons a bore and rebuild haha. The mains and rod bearings were blue hot. Cranks still standard and it had standard bearings. What kind of clearances would be ideal for a lake boat. I ran 15/40 syn and I got a 10 quart pan no cooler 70psi of oil press and usually 220F of oil temp after a couple good passes. Also what can you tell me about my cam? It looks like a custom grind.

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    At $100/ hp plus injection oil it's just to expensive to go that slow!

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    Senior Member schiada flatty's Avatar
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    Heres some more
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    At $100/ hp plus injection oil it's just to expensive to go that slow!

  4. #3
    gn7
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    Looks like it got into detonation. Most likely what took out the head gasket and the piston.
    Cam is 635 lift 262 @ 050, more than likely ground on 114 lsa. with an iron distributor gear.



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    Senior Member schiada flatty's Avatar
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    Quote Originally Posted by gn7 View Post
    Looks like it got into detonation. Most likely what took out the head gasket and the piston.
    Cam is 635 lift 262 @ 050, more than likely ground on 114 lsa. with an iron distributor gear.
    I think she was a little high on comp for 91 octane. I was told its around 10-1. When I buy new pistons ill make sure it's pump gas friendly. I noticed it did like the timing a bit retarded like 6* base and the stiffer spring in the destribitor. Pistons were TRW L2239N and heads are 990s

    As for the cam would you keep running this one or switch it? Seemed to really pull hard around 4-6500 rpm. I didn't sounds as lopy as my brothers 285 Hyd roller. I don't wanna take away perf with two big of cam.
    Last edited by schiada flatty; 03-11-2014 at 12:41 PM.
    At $100/ hp plus injection oil it's just to expensive to go that slow!

  7. #5
    gn7
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    Quote Originally Posted by schiada flatty View Post
    I think she was a little high on comp for 91 octane. I was told its around 10-1. When I buy new pistons ill make sure it's pump gas friendly. I noticed it did like the timing a bit retarded like 6* base and the stiffer spring in the destribitor.

    As for the cam would you keep running this one or switch it? Seemed to really pull hard around 4-6500 rpm. I didn't sounds as lopy as my brothers 285 Hyd roller. I don't wanna take away perf with two big of cam.
    Depends on the heads what the compression was. 10 to 1 is doable with aluminum heads. More 9 to 1 with iron.

    Cam depends on the rest of the build, like heads. If the cam is ground on 114 LSA it will idle a little smoother than a similar cam ground on a tighter angle.



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    Quote Originally Posted by gn7 View Post
    Depends on the heads what the compression was. 10 to 1 is doable with aluminum heads. More 9 to 1 with iron.

    Cam depends on the rest of the build, like heads. If the cam is ground on 114 LSA it will idle a little smoother than a similar cam ground on a tighter angle.
    Pistons were TRW L2239N and the heads are 990s. I think that's closer to 10-7 or 11-1.
    At $100/ hp plus injection oil it's just to expensive to go that slow!

  9. #7
    gn7
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    Quote Originally Posted by schiada flatty View Post
    Pistons were TRW L2239N and the heads are 990s. I think that's closer to 10-7 or 11-1.
    Closer to 11.5.
    Maybe 11 to 1 if it had a composite head gasket. Way passed pump gas compression with an iron head



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    Last edited by gn7; 03-11-2014 at 02:09 PM.

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    Quote Originally Posted by gn7 View Post
    Closer to 11.5.
    Maybe 11 to 1 if it had a composite head gasket. Way passed pump gas compression with an iron head
    what would you think I was making HP wise before? And would there be much of a drop in power with 9-1 comp hollow dome pistons which will lighten up the rotating assem which getting balanced again. Would my cam be too big for 9-1 comp?
    At $100/ hp plus injection oil it's just to expensive to go that slow!

  11. #9
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    Those bearings look stained like that when new. Just a piston & head gasket it appears.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Quote Originally Posted by Hass828 View Post
    Those bearings look stained like that when new. Just a piston & head gasket it appears.
    Bearings are clevette 77's. my cylinders are scratched enough to feel with the finger nail. So it's off to the engine shop to get hot tanked and bored 30 over
    At $100/ hp plus injection oil it's just to expensive to go that slow!

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    Isn't L2239N closed chamber? 990's open chamber 116-118 cc.?


    You must have crappy gas in Canada, I run those same (heavy) pistons with 109 cc iron heads and a .020 head gasket on 91 pump 38* locked and have never had a detonation problem.(your results may vary)
    The 77's in mine aren't blue, is that a car (spec)motor with a stock oil pump making 70 psi?
    Mine is .025 rods .032 mains with a mellings hv and 20/50 val.With 220* oil...maybe 70 psi...solid [email protected] 6800

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    gn7
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    WHAT? You didn't know that GM assembled thousands of BBC with CC pistons and OC heads.? Specially crate engines.



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    Quote Originally Posted by SoldHondaBoughtHondo View Post
    Isn't L2239N closed chamber? 990's open chamber 116-118 cc.?


    You must have crappy gas in Canada, I run those same (heavy) pistons with 109 cc iron heads and a .020 head gasket on 91 pump 38* locked and have never had a detonation problem.(your results may vary)
    The 77's in mine aren't blue, is that a car (spec)motor with a stock oil pump making 70 psi?
    Mine is .025 rods .032 mains with a mellings hv and 20/50 val.With 220* oil...maybe 70 psi...solid [email protected] 6800


    Yup those pistons are closed chamber design ive been told and Were run with open chamber heads. The block is a 286 casting 4 bolt with a melling HV pump. Here's the clearances from the build sheet. Rods .002-00225 mains #1 -.002 #5-.0025 Pistons were .004-008 and ring end gap .018 As for fuel I'm not sure lol
    At $100/ hp plus injection oil it's just to expensive to go that slow!

  16. #14
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    Quote Originally Posted by gn7 View Post
    WHAT? You didn't know that GM assembled thousands of BBC with CC pistons and OC heads.? Specially crate engines.
    And how do you get 11.0-1 compression with pistons that are 11.0-1 with closed chamber heads and he has open chamber?

    Quote Originally Posted by schiada flatty View Post
    Yup those pistons are closed chamber design ive been told and Were run with open chamber heads. The block is a 286 casting 4 bolt with a melling HV pump. Here's the clearances from the build sheet. Rods .002-00225 mains #1 -.002 #5-.0025 Pistons were .004-008 and ring end gap .018 As for fuel I'm not sure lol
    Kinda tight on the bearings, .0025 is the usually accepted number for rods and .003-0035 on the mains with a straight line bore.....Not so sure on the fuel? That's an opps, even at 10.0-1 91 octane be about the minimum although for some reason i get away with close to 11.5-1 and 91.
    Last edited by SoldHondaBoughtHondo; 03-12-2014 at 06:06 AM.

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