If you are trying to find the most economical way to get your Imp back on the
road, this may be your best solution. If on the other hand performance is
important to you, then you may not be satisfied with the conversion. As a
compromise between the two, you could consider increasing the compression ratio
of the 400, and possibly install a larger cam, along with a 4 barrel intake
manifold (the manifold is a must, I think). This may compesante for at least
part of the performance loss, especially at the upper rev range where the
potentially better flowing heads, combined with the better bore to stroke
ratio, and proper compression ratio could give an at least similar power output
(the low range may never be what the 413 offered). However, the bad news here
is that the best way to increase the compression ratio to, say 10.0-10.5 is
replacing the pistons, meaning an almost complete engine disassembly. You
could mill the heads, but this is good for only modest increases in compression
ratio.
Taking this thought further, you could also reduce the gear ratio from 2.94 to
say 3.23, to utilize the better revving potential of your new powerplant and
have less impact of the loss in low end torque. But the cost of all this will
probably exceed the cost for resleeving the 413 or getting the expensive
oversize pistons.
D^2, 2x68s
Quoting SFSurfDude@xxxxxxx:
> What's the deal?
>
> Well, the deal is that I bought a 400 on Ebay about a year ago that had a
> stock rebuild done to it, It also came with a two barrel carb that Im not
> sure I
> want to use, Im thinking I can use the one from the 413 (not sure). The price
>
> for the 400 was 500.00 I thought the price was good and that I would use it
> to
> swap out my 413 (as we know)
> I have been hearing of performance being comprimised which Im not crazy about
>
> hearing.
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