rut roh... super secret dakota project man...
>From: "Chad Evans" <hemidak@msn.com>
>Reply-To: dakota-truck@dakota-truck.net
>To: dakota-truck@dakota-truck.net
>Subject: RE: DML: RE: 318 vs 390 power
>Date: Thu, 16 Dec 2004 01:33:32 -0600
>
>
>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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