Intro and current project

[amdscooter]

^^^ I'm a noob here myself and I can attest to the fact this group of guys excel at spending other peoples money giving great advise. Just kidding peanut gallery.  This forum probably saved me untold $$$ even for my mild refresh and have been great helping me tune it in. I was in the same boat late last year, new to FE's and little idea how to go about getting what I wanted outta that block of iron between the shock towers. I ended up resisting suggestions for more cam and went modest as well. No regrets at all and the advise I got here helped boost my confidence as I put it together. Keep us updated and let us know how your new FE does on the dyno!

[My427stang]

I bet the 6.80/4.125 rotating assembly cost more than an off the shelf 6.70/4.25, however, in the end, it'll be very nice either way. Don't mistake my comments to the oriognal poster for criticism

I would have to say that nobody is cheaper than me, but there are things that you should spend money on if you go so far.  The intake however is minor, it can be changed later and the stroke is merely discussion, heck if you build a stout 390 it'd be a blast in that truck.

[turbohunter]

Thanks guys.
I love talking theory about FEs.
I can't believe I got into them so late in life. I was always a windsor guy as a young'un cause thats what was around.
As far as spending the money, I have to say I'm probably a bit guilty of going over board, but it's 'cause I'm having fun. And since the kids are all just recently out of the house I'm going through my second childhood. Or is it my midlife crisis?
Well whatever it is, I'm having fun.
BTW the intake was free. My brother is a gasket maker and used it for measurements.

[turbohunter]

Ok, still getting used to the site.
Lets see if these pics of my pistons come out.
Shooting at 9.5/1 compression ratio

[My427stang]

I just woke up so my math seems to be a little clunky, but aren't those deeper in the hole than the card says?

4.125/2 + 6.8 + 1.275 = 10.1375, with a 10.170 deck that is .0325 under, that will take a heck of a cut to get to .005 below

FWIW, the compression should be fine, looking at it, my guess is he is going to cut the deck to 10.160, that would be 9.43:1 compression with a 72cc head,  but the quench is a smidge on the big side at .063.  That's not horrible, just a little bigger than most do nowadays

BTW, those pistons would work well in a hot rod with a 4.375 stroke and a 6.7 rod (assuming the long stroke motors use a 6.7 rod, I haven't done one yet)

[Barry_R]

That 1.275 compression distance number cannot be right looking at those pistons - they look way too far down from the top in his picture.  The 4.375 strokers with a 6.7 rod are normally putting the pin into or right up against the oil ring groove.

[turbohunter]

Sorry for the late reply.
Was at my daughters commencement all day.

Here's what I've got.
10.14 deck
4.125 stroke and bore
6.800 rods
1.275 compression height
Which should leave the piston in the hole by -.003ish
Heads cc'd at 76

The 6.7 vs 6.8 rods is where we miscommunicated. And the deck.

[My427stang]

OK, so I get .0025 below deck

Using a .041 head gasket, 4.4 bore, and the 20cc dish with 76cc heads and a 4.125 bore/stroke, I get 9.46:1 and .0435 quench.

Nothing wrong with that, just need to make sure you dont undercam, using a 106 ICL, I would not go less than 260 advertised duration.  However, knowing you want a torquer, I would still like to see something like a 268-270 adv but on 104 ICL, just because I like the slightly added lift and duration for a stroker

[turbohunter]

  Just bought it from Barry
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=1568&sb=2

[My427stang]

Should be a nice setup!

[turbohunter]

Ok just got home from my dyno session.
Ran into stupid little problems that I'm sure you all go through.
One was header bolts that didn't quite line up. Not to bad, a little grinding took care of that.
The one that really torqued me off was my brand new MSD distributor would not send a signal, so no spark.
It's new right, it's gotta be good. Must be wiring somewhere. Nope, it was the darn new out of the box dizzy.
Can you say, "you mean I have to put another gear on".
Got a new one and got past that and changed the gear AGAIN.
Now on to the good part.
The engine did exactly what we wanted it to.
It's nice when a plan comes together.
It's a great truck motor.
400 hp 500 ft lbs
Notice the Super Flo only spit out numbers from 3100 rpm.
Figuring a bit more torque at 2500.
Fired it up with an 830 Holley and it made more hp with that (411).
Ended up with a 700 which of course was better down low and better for the street.
These numbers are from the 700.
The darn girl just kept repeating run after run.

[turbohunter]

Thought I'd show you guys the top of the valve train.
Hoping to not have to break into this engine in the future (to much) I wanted steel rockers.
I was turned onto these PRWs by a local machine shop that has been in the business for many years.
I know that there has been some documented concern over the hardness of the adjusters (and the fact that they are produced in Asia) so what I did was get some Manton adjusters as well as Manton pushrods.
They are stout pieces. All was well in the dyno session. Will let you know if I have any issues.
Had to do a little clearance grinding for the top of the pushrod.

[My427stang]

Looking good!

[turbohunter]

Thank you.
This was my first ever dyno experience and I'm over the moon with the plan and the process coming together.

[My427stang]

What is the "before" motor in the truck now?  Interested in hearing the difference between old and new!