383 Rebuild 2.0

[Larrry B.]

After a very long process I've finally been able to complete my motor re-build and will bringing it home this week.

Block bored .040" over.
Stock forged crank and rods all reconditioned, rebuilt, balanced.
Forged domed JE pistons re-worked and "flattened" to bring compression down to 10:1
Trick Flow 240 heads.
Howards 720555-12 Cam.
Hughes rockers, 15103C
"Summit" lifters, made my Morel. The Trick Flow pushrods are to large for these, had to order a custom set by the builder.
Edelbrock RPM performer DP intake, smoothed out by Wilson with 1" tapered spacer.
Edelbrock 800 AVS-2, I had it so I used it.
440 Source Fabricated AI valve covers.
MSD pro-billet distributor, had to grind out some of the valve cover to fit with almost no space for the boot.
TTI headers (once re-installed).
Pro Race damper.

After 4 pulls on the Dyno, top 2:

458 hp @ 5800 rpm
453 ft-lb @ 4800 rpm

457 hp @ 5800 rpm
447 ft-lb @ 5000 rpm

Speaking with the builder, with a more aggressive cam and larger carb I'd get more power but I'm happy with the results.

With the re-built TKX to wide ratio, the car should drive great.

Now to get it all back in the car....

 

[RemCharger]

Very nice! So did it require valve to cylinder clearancing ?

 

[Larrry B.]

Builder did a good job on machining the pistons removing the dome, thankfully they were solid and I was able to re-use them.
That brought the compression down from just a hair over 11 to something much more friendly on the street.

Had to use a much thicker head gasket than before and used these: Cometic MLS C5462-080
With these everything had room to operate without issue.

 

[RemCharger]

So it wasn't really checked?

 

[Larrry B.]

Everything was checked, from my discussions with the builder the valve to cylinder clearance wasn't an issue. More the piston height variance after machining, hence the thicker gasket.

 

[PRHeads]

How high was it taken?
What was the power at the end of the pull?

Any dyno sheet?

 

[r4sedan]

Sounds like a nice engine.

 

[Larrry B.]

How high was it taken?
What was the power at the end of the pull?

5780 RPM: 416.2 (ft-lb) / 458 hp
6010 RPM: 399.3 (ft-lb) / 456.9 hp
6460 RPM: 339.2 (ft-lb) / 417.3 hp
5906 RPM: 404.2 (ft-lb) / 454.5 hp

Any dyno sheet?

Yes, 4 pages for each pull, figures listed above.
Peak numbers in post #1.

Builder mentioned the torque curve was really good, which I saw on the screen but don't have a hard copy of.
I'm picking it up tomorrow and will ask if I can get a printout.

Heads, cam, lifters and pushrods are the only new parts, everything else was carried over from the previous build or had already.

 

[Larrry B.]

Turn up your speakers....

 

[Larrry B.]

For what's it worth, before I bought the parts I contacted Trick Flow to confrm this before I bought the cylinder heads and was told:

"There is a minimum bore spec listed at 4.320", which is due to concern for intake valve to cylinder wall clearance. However, the TFS heads can be used on the smaller bores IF the camshaft is less than .600" lift."

I see there was another 383 possible rebuild thread going last year and this was commented on.

In my case I had no issues.