I only know of one instance, personally, where 1.9 heads were used on a
2.1.  There was very little difference in performance, MPG remained
virtually the same, but he did notice some pinging, under load, using
regular gasoline.

I realize one example doesn't tell all, however.

Mike

Jake de Villiers wrote:
> You sure Mike?  Ken doesn't mention it on his
> site.......http://www.neksiwel.20m.com/custom.html
>
> Its only 9.5:1 after all.  Gas mileage would improve nicely too.   :)
>
> On 9/26/07, Mike Collum <collum@verizon.net> wrote:
>> Yes you can ... but ... the compression will be higher and you must use
>> premium fuel to prevent predetonation.
>>
>> Mike
>>
>>
>>
>> Todd Last wrote:
>>> I noticed the previous post which said you can place 2.1 heads on a 1.9motor.
>>> So my question is:
>>>
>>> Can you place 1.9 heads on a 2.1 motor?
>>>
>>>
>>> Todd
>>> '88 Westy
>>>
>
>
>
> --
> Jake
> 1984 Vanagon GL
> 1986 Westy Weekender "Dixie"
> www.crescentbeachguitar.com
> http://subyjake.googlepages.com/
>