I'm pretty sure you can get 390ci out of a 318 w/4.00" stroke and bored .030
over. You have to realize that you are still starting with a cubic inch
advantage with a 360 block, if you plan to build it for 1hp per cubic inch
power ratio, you will always be at a 20-30 hp disadvantage starting with a
318, other problems would be:
1. Smaller bore means possible valve shrouding, so smaller valves would have
to be used. Since this is in the "big-block" territory, you need to breath.
2. Smaller bore means more grinding for rod clearance on cylinder walls.
3. Harder to find the special stroker pistons you need.
Don't get me wrong, it can be done, but if you already have everything
apart, it sure is an easy 30 hp. If you really want to, go ahead, be
different, save a few bucks, just don't get any last minute regrets when you
are done, wishing you had that extra horsepower, cause' that would be a more
expensive conversion once done.
Mark Kuzia
flyboy01@mediaone.net
http://people.mw.mediaone.net/flyboy01/home.html
1995 Dakota 13.79 @ 102.45 mph
~360ci, 5-spd, 4.11 LS (8 3/4 [3.90 SG] coming soon)
1994 Dakota 15.36 @ 91.56 mph
~318ci, 5-spd, 3.90 LS (bone stock, no mods)
----- Original Message -----
From: <KenneallyIII@Gateway.net>
To: <dakota-truck@buffnet.net>
Sent: Sunday, May 13, 2001 11:34 PM
Subject: Re: DML: Re: 318 (5.2L) Stroker
> I'm not saying that it's not a good core: I'm just saying that it's not
the
> ONLY core out there. Basically, I'm curious about just how far a 318 can
be
> taken. I'm just contacting you guys to see if anyone has thought about/
tried
> this before. I'm currently running a 318 in my '93 4x4 that has been built
up
> for a supercharger. I still have the original 318 (with a mild cam and
Crane
> roller rockers) in storage. The supercharger (Paxton- #%@&*%$- you know
what
> I mean?) has proven to be less than reliable. I'm not completely satisfied
> the power I get from the blower when it works, either. I was not aware
that a
> 360 computer could operate on a 318 harness when I undertook this mod. If
I
> had known this, I would have built a 360 instead, but hindsight is 20/20.
> Meanwhile ,I have a perfectly useable 318 to play with, and I see no
reason
> to waste it. True, a 408 would create more torque, but a 390 would
probably
> give me all the torque I'm looking for and probably use a bit less fuel.
So,
> returning to my question, is it feasible to install a Hughes Engines 4"
> stroke 340 crank into a 318? Are there any fundamental mechanical
> incompatibilities that would render this concept impractical/ unworkable?
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