My boss's r/t 408 runs 12.7's N/A
>From: "RayB" <bpracing@worldnet.att.net>
>Reply-To: dakota-truck@dakota-truck.net
>To: <dakota-truck@dakota-truck.net>
>Subject: DML: RE: 318 vs 390 power
>Date: Thu, 16 Dec 2004 02:22:54 -0500
>
>
>All things being equal, more cubes + longer stroke = more power...but most
>importantly for a daily driver, more torque. If you're not going to race
>this thing then build whichever engine for torque instead of high rpm
>power.
>Consider your driving habits and if you seldom have the room to wind it out
>through the gears, you will be much happier with lower rpm torque.
>
>You didn't mention what gear ratio you have but something in the 3.90 -
>4.30
>range will also get you moving a lot quicker. A 2400 stall converter
>would
>also be nice.
>
>I can give you a couple pieces of advice from personal experience. That RT
>cam you have is no great improvement even in a 318 (too mild). The RT
>heads are gonna hurt a 318 and are unnecessary even on a 390 if your goal
>is
>low to mid range torque. You can do much better with a mildly ported stock
>head with 1.97 intake valves for a lot less money. The RT heads simply
>have
>ports too large for a relatively low rpm street engine. I've encountered
>several 360 and 408 Daks that can't come close to the performance of my
>318.
>Check it out at the dragtruk link in my sig. It's all in the combination
>and bigger done wrong isn't always better.
>
>Whichever engine you ultimately decide to build, it would be wise to
>discuss
>your combination and goals with a cam manufacturer (not just a vendor)
>before choosing the cam and rocker ratio. As for superchargers...I have a
>friend with a Vortec blown 318 that runs mid-12's @ 110 and it's also
>awesome on the street. HTH.
>
>RayB
>http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
>
>
> > -----Original Message-----
> > From: kvmac45@comcast.net
> >
> > Question on power. I am in the process of accumulating parts for
> > an eventual
> > engine rebuild/swap for my 92. Have the current mods that will be
> > on the new
> > engine.
> >
> > M1
> > MSD6AL
> > Blaster SS coil
> > K&N filter
> > March underdrive pulleys
> > Thorley headers
> > Ported/polished TB - 50mm
> > Electric fan conversion
> > Mopar PCM
> >
> > I also have the Mopar RT cam 5249549
> > 260/264dur/.458/.467lift. It is not currently in the truck. I figure it
>is
> > probably too small for a 390, but will work great in a 318 with my
>current
> > mods. Reason I got it was the price - dirt cheap. I bought it
> > before the 390
> > bug hit. Also have a set of 1.7 Crower rockers that are waiting
> > until I get the
> > heads.
> >
> > I will be getting a set of RT heads regardless of what engine I
>ultimately
> > decide to put in. I figure 1.92 for the 318, or 2.02 for the 390.
> >
> > Just how much of a power difference will I see in a 390 vs. a
> > strong running
> > 318 with the above mods, including the cam and heads? Trying to
> > decide if it is
> > really going to be worth the extra expense to get the parts for a
> > stroker. This
> > is my daily driver, so downtime is limited to weekends only. As a
> > result I will
> > be building up the engine on the side, then performing the swap
> > when it is all
> > ready to go. This is not a drag project or anything like that. I have
>190k
> > miles on the engine, with no opportunity to get another vehicle
> > anytime soon,
> > except for a beater car, which I do not want to do.
> >
> > I know for the 390 I will need to get the block bored and clearanced,
>new
> > pistons and rings, connecting rods and a 4" crank. For my truck I
> > figure a 360
> > PCM and 21-24# injectors would be a good idea too. Probably bump
> > up to a 52mm
> > TB, and eventually one of the high flow Holley fuel pumps.
> >
> > Ultimately it may come down to money, but I want to give it a
> > shot if the gains
> > are going to be worth it. Of course, I could always go with the
> > 318 and then
> > throw a s/c on it later next year too.
> >
> > TIA, sorry for the long winded post.
>
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