[Gmecm] BCC lookup

[Jay Vessels]

Hi there!

JM is spot-on.

You can put the GenII ('87-'93 or '94 2.8V6 and 3.1V6 depending on car 
line) top end on a block that originally had iron heads.   Due to a 
different intake port configuration, your only choice for an intake is 
the matching GenII lower intake manifold for MPFI.  The carb. and TBI 
intakes won't fit.

While the chambers on the GenII heads are smaller than the iron heads, 
the GenII engines' pistons will fit, and there are matching pistons for 
the 2.8, 3.1, and 3.4 iron-head blocks, since all three were available 
as GenII or GenIII configurations.

The good news is that the MPFI intake can be turned around 180 degrees 
so the throttle body faces the front of the vehicle.  So, if you're 
going to use the GenII heads on a RWD application (i.e. S-10) you'll 
need to convert it to MPFI (i.e. 1227730 + $A1).  These engines were 
also DIS, so your choices are to either use the DIS hardware, or if your 
block/crank is not so equipped, do some machining on the intake to get a 
distributor to clear.

GenIII (3x00) heads are much better for flow, and have the same issues 
-- again, TBI and carb. intakes don't fit.

There are a bunch of little detail bits that have to be worked through 
(i.e. sensor locations, throttle cables, etc.) but it's all possible if 
you have the patience.  Most of this work has been documented on the 
V6/60 boards ( http://60degreev6.com/ ).

None of this applies to the 3.4DOHC engine, which while it's a V6/60 
like the others, so much was changed to drive the overhead cams that 
retrofitting the DOHC heads onto a different block is practically not a 
choice.

Jay Vessels
1982 Chevrolet S-10 Sport, 2.8V6 TBI
1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI

J M wrote:
> Yes, sort of.
> 
> I haven't paid much attention to these engines since
> the late 90's, and I mainly looked at the rear wheel
> drive applications (camaro, firebird, s-10).
> 
> The rear drive engines had cast iron heads, front
> wheel drive engines had the aluminum heads.  The cast
> iron and aluminum heads will physically interchange on
> the blocks.  The issue is they have different intake
> ports.  So if you want to put aluminum heads onto a
> 2.8L camaro you would also need the intake, valve
> covers etc..  
> 
> The other issue is putting those aluminum front wheel
> drive heads on a rear wheel drive 2.8 long block also
> results in something like 14:1-15:1 compression ratio.
>  I did the math too many years ago to remember
> exactly.
> 
> On a side note, I still have the original 2.8L from a
> 87 camaro I used to have, and 3 cylinder heads, 1
> complete intake and a second intake top from 3.1L
> cavaliers I pulled out of a repair shops trash ~1999. 
> Had the idea of throwing together some sort of dune
> buggy vehicle from spare caprice parts and throwing a
> set of aluminum heads on that 2.8 then run it on vp100
> race gas.  Although E85 is readily avialable now, so
> that would be a more attractive fuel.  I highly doubt
> the stock lower end would hold together but sure would
> be fun to find out how long it would hold together.
> 
> --- Mike V <efi at dyakron.com> wrote:
> 
>> Thanks Jay,
>> Can AL heads replace iron from a bolt-on
>> perspective?
>> mv
>>
>> ----- Original Message ----- 
>> From: "Jay Vessels" <jay at vessels-clan.com>
>> To: <gmecm at diy-efi.org>
>> Sent: Friday, August 17, 2007 8:05 PM
>> Subject: Re: [Gmecm] BCC lookup
>>
>>
>>> Hi there!
>>>
>>> '87 "A" body is Chevy Celebrity, Pontiac 6000,
>> etc.  1987 is the first 
>>> year for "GenII" aluminum heads + DIS 2.8V6 FWD.
>>>
>>> Jay Vessels
>>> 1982 Chevrolet S-10 Sport, 2.8V6 TBI
>>> 1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI
>> pending)
>>> Mike V wrote:
>>>> So, what is a 1987 "A-Body" ?  Did it have AL
>> heads?
>>>> Do you need a FWD V6 chip?
>>>> mv
>>>>
>>>> ----- Original Message ----- From: "Ryan Hess"
>> <rgmecm at yahoo.com>
>>>> To: <gmecm at diy-efi.org>
>>>> Sent: Friday, August 17, 2007 12:36 PM
>>>> Subject: Re: [Gmecm] BCC lookup
>>>>
>>>>
>>>>> Exactly right, they use different knock filter
>> boards.
>>>>>
>>>>> Mike V <efi at dyakron.com> wrote:   "whuh?"  You
>> mean there's a 
>>>>> difference?
>>>>> Knock filtering different with AL heads maybe?
>>>>> I'm curious now... 8-P    What are you hoping
>> for?
>>>>> AZTY <<==<<  1992  3.1L V6 Auto trans, from a
>> 7730 ECM  "F Body"
>>>>> ASMY <<==<   1987  2.8L V6 Auto trans, from a
>> 7730 ECM  "A Body"
>>>>> ARPM <<==<< 1991  3.1L V6 Auto trans, from a
>> 7730 ECM   "F Body"
>>>>>
>>>>> Cheers,
>>>>> mv
>>>>>
>>>>> ----- Original Message ----- From: "Ryan Hess"
>> To: Sent: Thursday, 
>>>>> August 16, 2007 1:39 AM
>>>>> Subject: Re: [Gmecm] BCC lookup
>>>>>
>>>>>
>>>>>> Thanks!
>>>>>>
>>>>>> Do you know whether they are RWD or FWD?
>>>>>>
>>>>>> The one(s) I don't want are from f-bodies.
>>>>>>
>>>>>> Ryan
>>>>>>
>>>>>> Mike V  wrote: > AZTY <<=====<<  1992  3.1L V6
>> Auto trans, from a 7730 
>>>>>> ECM
>>>>>>> ASMY <<====<<   1987  2.8L V6 Auto trans, from
>> a 7730 ECM
>>>>>>> ARPM <<=====<<  1991  3.1L V6 Auto trans, from
>> a 7730 ECM
>>>>>> HTHs
>>>>>> MV