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HemiAlex

My Build: 68 Roadrunner With A 6.1 Hemi

68 posts in this topic

This is a copy and paste from my classic Mopar forum, but I'm going to update it as I go... Pardon the classic oriented tone of the post, I'm trying to relate it all to classic mopar guys.

 


 

I've been dying to update progress on my swap from a Big block to a 3G Hemi. 

 
I had a perfectly fine running 69 HP 383 with 915HP heads, a DP4B/650DP, HP Manfiolds and a 4 speed with 3.23's. I drove it like that for about 1000 miles and it bored me. The combo that I thought I wanted and I'd always dreamed about. I didn't like it for the type of driving that I do.
 
So, I pulled the 383 and parted all my big block stuff on Craigslist and on here. Sold all of it for a fair price and decided that it was time for a new hemi. I was just upset with bent pullies, leaky valve covers and general old car quirks.
 
I worked from 2006-10 for a shop that worked on and modified the LX Hemi cars, so I know my way around them quite well. I fell in love with the powerplant in a 4700lb station wagon, so my 3600 lb B-body would be ridiculous fast with just a simple head and cam 6.1. I started with just a bare 6.1 block. Literally nothing else at first. I knew about what I wanted, and I had really big dreams at first. I was looking to build a motor that would compliment all the handling stuff that I've done to the car.
 
-1.24" T bars
-Koni Red Shocks
-AndyF's LCA plates
-Tubular UCA's (Coming off now...)
-New bushings and Poly where I could
-Firm Feel Firmer than stage 3 box from Dick
-11.75" with Firm Feel Carbon Metallic Pads
 
 
I ran without sway bars, so a set of fresh leaf springs and F&R Hotchkis or Hellwig sway bars are about all I need to complete the suspension to where it needs to be. All of the above made the car feel amazing, even in it's incomplete state.
 
I started my motor build parts gathering a few years ago and it all started with a $300 6.1 block that I was going to build a 426 or forged 6.1 out of. I quickly realized that I didn't need that much motor, so after some horsetrading with my friend uhcoog1 (wade) I ended up with a stock bore 6.1 in great shape. I picked up a stock set of 6.1 rods and pistons and started my process of building up a mostly stock 6.1 shortblock. Nothing fancy except for a set of stock rings opened up a little bit to keep the pistons from breaking the ring lands (a common 6.1 issue). Otherwise, the whole motor is stock spec with no after market parts aside from the valve springs (PAC) and the Comp Camshaft.
 
Here is the motor buid
 
4.055x3.580 6.1 
Stock pistons/new rings
Stock Powdered metal rods with new Chrysler rod bolts (Same as 8.4 viper)
King Bearings
Stock 6.1 Timing set and tensioner 
Melling Oil pump
Jeep SRT8 Oil Filter Adapter
GTP ported 5.7 2009+ Eagle Cylinder heads with PAC 1220 Springs. These are a closed chamber heads and will net 11:1 CR with my stock shortblock. More than do-able with 93 octane all day long
Frank Racing 219/231 .584/.584 112 LSA camshaft
Stock 6.1 Intake Manifold with BBK 80mm tb
SRT4 Stage 1 43lb injectors
Stock 6.1 fuel rail
TTI 1 3/4 Headers to a 2.5" H pipe system with turbo mufflers
Lakewood Bellhousing from a SB
MP/Mcleod Hemi 10.5 Conversion Flywheel
Sachs Diaphragm 10.5 stock clutch
TTI Motor mount brackets with a solid and rubber mount on either side
Milodon Oil Conversion oil pan
 
It's a bit scary to me how stock and simple this motor is. Nothing fancy at all.
 
I've just purchased the Megasquirt MS3X kit from Mike @ www.efisource.com as of yesterday and I'm really looking forward to running his system. It is the first kit to come out for a 3g hemi that is a refined harness that is based on megasquirt. 
 
The electronics portion of this build will be a copy of the fuel system that uhcoog1 has on his road race duster. So simple yet it more than makes up for the fact that I'm still running a stock fuel tank. If he can't run out of fuel on a roadcourse, then anyone on here will be fine. 
 
My fuel system will be the following
Carter 4601HP pump (ran both my 383 and 440 with a carb previously)
BCBroncos Accumulator to act as a resivour/surge tank.
Walbro GSL392 Inline pump
Corvette Fuel/Filter Regulator by Wix.
 
The car already had 1/2" feed and return lines in stainless with a 1/2" stock style pick up that I added a 1/2" return to, so my fuel system is ready for whatever I can throw at it with just a pump change. 
 
Over the next few weeks I'm going to detail my engine build and install for everyone to see. 
 
I'd like to eventually do up a website to help inform people about the process of putting this new style of motor into a classic mopar. I had a cardomain website a long time ago, and I'd like to do it one better.
 
 
The goal for me is to have a fair weather daily driver that I can hop in and knock out 300 mile day trip while maintaining above average fuel mileage, not smelling like fuel (its a real problem), being able smile from the speed and being able to have a road course worthy classic Mopar.
 
Here are some already shown pics of my car...
 
 LowRR.jpg[/
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DSC_0525.sized.jpg
 

 

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Nice setup Alex. I'm still collecting parts to finish my build. I have the Suspension (Full Hiotchkis setup with 1.03 T bars) and brakes (Wilwood 14"/6P front 13"/4P Rear) installed. Engine is here (Aluminum 440 with ported 6.4L heads and ported 6.1L intake), A580, Torque convertor and standalone controller and harness purchased. I hve the new Borgeson steering box with 1 1/4 sector shaft and new pitman and idler arms along with teh bergman coupler to make it a bolt up to the stock column. I just need the tubular K Frame and fuel system. I'll probably end up sticking with the 383 for the summer then swap to the late model engine next year. Not enough time or money right now. I'll be following your build closely. Can't wait to see it done...

 

J

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Cool stuff!  Will the 2009 5.7 heads and valve train be OK with that cam in terms of PTV clearance?

 

 

It's common swap. Same style of build that buckeyeguy used for his build.

 

6.1 headgaskets (I can shim them out, if needed)

Eagle Pushrods

stock rockers from an older 5.7/6.1

Eagle valve covers (obviously)

 

It will have more than adequate piston to valve clearance. It will be checked when I assemble the motor. It should be about .090.

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The fuel injection made it in yesterday. It would have been here faster, but USPS tried to deliver to a business on Saturday. No big deal.

My initial impressions are very good. The build quality of this box is almost on par with an XFI box. Great connectors that give a rewarding pop from vacuum when you disconnect them, heavy gauge wiring with good insulation and quality connectors. It only needs a 6 wire hook up to run, which is easy to deal with. 

 

It comes with a 6.1 MSQ file that has sucessfully fired a 6.1 Drag pack motor at Ray Barton. It will fire this small cam 6.1 with ease.

For $1300 this kit far exceeds my expectations. The simple fact that something as capable as MS3 is housed in this box, makes it an unbeatable deal.

 

 

post-1080-0-51232300-1392872653_thumb.jpg

post-1080-0-90448500-1392872667_thumb.jpg

post-1080-0-17728000-1392872674_thumb.jpg

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The fuel injection made it in yesterday. It would have been here faster, but USPS tried to deliver to a business on Saturday. No big deal.

 

My initial impressions are very good. The build quality of this box is almost on par with an XFI box. Great connectors that give a rewarding pop from vacuum when you disconnect them, heavy gauge wiring with good insulation and quality connectors. It only needs a 6 wire hook up to run, which is easy to deal with. 

 

It comes with a 6.1 MSQ file that has sucessfully fired a 6.1 Drag pack motor at Ray Barton. It will fire this small cam 6.1 with ease.

 

For $1300 this kit far exceeds my expectations. The simple fact that something as capable as MS3 is housed in this box, makes it an unbeatable deal.

Looks like a well made product.

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Man oh man what a awesome project! Subscribed!!!! I love the color and seems your taking a very serious approach. Can't wait to see more updates. New school with old school cars always get me excited to watch the build.

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I have a customer doing a MS3 pro build. I am going to tune it for him once he is done.  It is pretty flexible and complete in terms of the software support

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Awesome budget 6.1 build up! Did you buy a new front cover or is that a restored one? And nice how close the block and car color are, Very cool!

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