Ellwein Racing Engines 383LT1 #6
Dart Pro-1 (LT1) cylinder heads installed 10-10-07! 
DTS Dyno test 2-9-08 showed 440hp at 5800rpm, 454tq at 4600rpm
 

This is the build web page for ERE383 #6 (Ellwein Racing Engines LT1-383 #6). It will be built around the free OHIO CRANK that I gave away as an incentive to purchase this short block.  The rotating assembly will be all forged with the "Ohio Crank" 4340 crank, Lunati I-beam Pro Mod rods, Mahle flat-top pistons and Eagle splayed main caps at 2, 3 & 4 with ARP main studs.


The block, fully machined and with  Eagle splayed main caps with ARP Studs.  The block was align bored very slightly, (see the material removed from the oil pan rail).



Here is the balance card from McKeown Motorsports



Since this crank is the "lite" version it has less material in the counterweights.  The balance machine wanted weight added where there exist "no" counterweight.  So Mark McKeown welded material onto the counterweight end as needed.  This was an extra effort that I very much appreciate.


January 14th, 2007

Rod prep.  (waiting for paint to dry)

I cleaned all 8 Lunati Pro Mod rods and tested piston pin fit by "feel".

Now to the long process of measuring rod bearing clearance.  I set the micrometer to 2.1000 and zero out the dial-bore gauge.  Re-check it every now and then because temperature changes and body heat really screw things up.

Get the bearings installed and torque to .0045" stretch.  See how far off the dial bore gauge is off from zero.

And the results are from .0020 to .0025"
That's what I hope for. The bearings are the big money Speed Pro Duroshield coated C8-7100CH


Now I'm assembling the rod-piston.  Look at that Mahle piston.  It's a work of art.


I used my new pro ring file machine for the 1st time.  Normally this job takes 4 hours, (yes I'm slow).  Now it's 1 hour taking my time.


Now for something completely different:  This is a new brand of LT1 cylinder head, the Dart Pro-1 (LT1).  The chambers are 60cc and the intake runners are 180cc.  This 383 will be a good test of their performance potential.


Dart head is cleaned with brake-clean.


Using ARP 12pt head bolts, (big money).


Quick test fit.  Looks by eye-ball that I may have to shim the rocker stands up-higher.


fuzzy photo of new Crane 109831 (GM846) cam.


Cloyes Hex-A-Jjust timing set cam button ground shorter so as not to interfere with Opti-spark.


Broad photo of the Cloyes Hex-A-Just


M99HVS oil pump and Mr. Gasket oil pump stud.


New stock GM hydraulic lifters.


Dart head intake runner close-up.


Red magic marker on valve tips.


This is the rocker tip to valve tip location with no shims under the shaft rocker stands.


This is ERE-383 #6 as of 10-21-07

Assembly raw detail:


This is the "free" crankshaft, OHIO CRANK brand, 4340 forged steel 3.75" stroke.  It's part number 43503750LT (lite).  The oil holes are beautifully contoured/chamfered.  It has all of the rod journals rifle drilled.



January 2nd, 2007
The rotating assembly has just returned from the balanced shop and I set the parts out for a photo shoot..  I'm working with McKeown Motorsports Engineering now and they performed the expert balance work.  They also have been helping me engineer custom ROSS pistons for a 1200hp 383LT1 project and they will be assisting in the design of my own custom ROSS flat-top and D-dish piston for street/strip, nitrous and mild blower motors.


January 14th 2007
Beginning of short block assembly while waiting for heads/cam:



I have the rotating assembly and fully machined block so now lets get the block painted with POR-15.  This is the base silver primer.


And now she's POR engine black.


January 21st 2007


Installing the rear cam bearing.  These are the nice race coated Dura-Bond CHP-8T


You can see the cam bearings in this photo


Crank in


And pistons/rods.  BAM!  A shortblock.


The pistons are 0.010" in the hole.  I selected this 0.026" thick Mr. Gasket head gasket.


Right side heads on.


Another item being tested is a set of  Probe shaft rockers.  These are the rocker stands.


The Probe rockers look to be very high quality.


Sorry for the fuzzy photo.  Is my camera on it's last leg?  I hope not.


Ground-off cam bolts so that Opti-spark fits.


Lucky me.  Intake centerline is 107 dead nuts on.  This is the GM 846 cam.  The Hex-A-Just was set on straight-up, (no retard, no advance)


Stock LT1 windage tray is snipped a little bit to clear around the oil pump body.  Many have run their motor without this windage tray and smoked their bearings only to blame it on a HV oil pump.  Fact is, HV pumps will not pump a sump empty any sooner than a stock volume oil pumps.


Probe shaft rockers added and adjustable pushrod used to find proper length.  7.050" is the initial measurement.



Pushrods installed.


The mark is hard to see in the photo but it's right in the center.  With shaft rocker the proper geometry is only determined by shims or no shims under the rocker stands.  The pushrods have no effect on rocker tip to valve tip location.  The pushrods need to be the proper length to fit in the lash adjuster nut.


All rockers and pushrods installed and lifter pre-load at 1/2 to 3/4 turn past zero.  Pre-lube drill spins at low rpm (40psig).  This also verifies that oil moves up the pushrods and onto the rockers and springs.


See the oil starting to dribble.  The crank needs to be turned a few times while doing this.


Now making ready for intake manifold installation.


Clean the bottom of the Edelbrock LT1 Airgap manifold.


Manifold on before the RTV sets up.


Here is a test fit of valve covers over the Probe shaft rockers.  The Proform on the right, (left head), fits fine but so does the GM Corvette composite on the left, (right head).  That is a sweet situation.  We have a choice of at least 2 brands of valve covers.  The Proforms need to have the oil baffle removed.  The Vette covers need to have the oil baffle walls trimmed which is not at all difficult with a pair of tin snips.


I like the 'Vette valve covers.


www.Karl-Ellwein.org 2007, Ellwein Engines 2007, email Karl Ellwein