Marc S build version 6.0

[mikeyfitz]

Holy shit. Marc, this is gonna be SICK

 

[RetroGT2006]

Wow what a build!! Talk about inspiring, I definitely want to build my car up once I'm done with school since she's paid for.. Screw trading this car in for a 2013+

 

[Marc s]

It's now 260lbs lighter than it was two weeks ago. I'm not sure what the weight difference will be between the 4.6 3v with the aluminum C&L intake and the 358ci Yates engine. I would bet since the new engine has a dry sump, it will weigh around 100lbs more. I'm not done taking weight out though.

 

[Surfstang2020]

260lbs ? Holy crap thats a lot o weight to loose this thing is def gonna be sick can't wait to see the finished product. FYI I'm living vicariously through builds like yours since I can't quite afford it
At the moment maybe one day lol but props to you for doing something different


Sent from your moms phone

 

[MindIfISmoke?]

Hmmm i wonder who helped gut and put your k member in record time.... lol.. we still have a ways to go!

Sent from my DROID RAZR using Tapatalk 2

 

[Marc s]

Hmmm i wonder who helped gut and put your k member in record time.... lol.. we still have a ways to go!

Sent from my DROID RAZR using Tapatalk 2

What do you mean helped. I didn't have any part of the K member install. That was all you.

 

[ZmanM3]

Hmmm i wonder who helped gut and put your k member in record time.... lol.. we still have a ways to go!

Sent from my DROID RAZR using Tapatalk 2

What do you mean helped. I didn't have any part of the K member install. That was all you.

About time he worked on a car that wasn't his!

 

[Marc s]

More parts arrived today. The X351 Yates road race/short track intake is a difficult piece to find. I was able to locate one that has already been ported with the same CNC program that was used on my heads. I also bought a used Sprint Cup 4 gallon dry sump tank that has 3 tank heaters. I am going to mount this in the back seat area and run a -16 feed line to the dry sump pump and a -20 return line. Also, the roller lifters arrived as well.

The valve springs should be in Friday and the tracking info shows the cam arriving on Monday from Crane. I hope to have the heads and shortblock together by Monday evening so I can degree the cam in Tuesday. After that, I can start the assembly process.

 

[ZmanM3]

I love the pics, going to be a beast!

 

[recordbreaker5]

sub'd

 

[psfracer]

love the intake. Why are you not going with just new roller lifters? As far as the rest of the valve train, are you going with titanium retainers / intake valves? Or perhaps they are already there? As you know already that will go a long way with regards to valve spring life.

 

[Marc s]

love the intake. Why are you not going with just new roller lifters? As far as the rest of the valve train, are you going with titanium retainers / intake valves? Or perhaps they are already there? As you know already that will go a long way with regards to valve spring life.

The lifters are new Comp's. The valves and retainers are titanium.

 

[psfracer]

ok, i guess its just the picture, because they don't look new.....

 

[stkjock]

the roller "wheels" Paul?

 

[Marc s]

ok, i guess its just the picture, because they don't look new.....

the roller "wheels" Paul?

It's a funny reflection from the flash and the wheels have some sort of cosmoline on them.

 

[Marc s]

More parts came in today. No, they are not used.

 

[Gabe]

Oh God, I hate seeing that brand of "racing" valve springs ... I had one of their "racing" springs break in my heads/cam '07 Charger and it destroyed a piston, bent a valve, bent pushrod ... some nice damage ... and they were in there for about 3 yrs/~24k miles ... and working under their rated lift spec

I replaced them with PSI springs ... highly recommended for the 5.7/6.1 or stroker Chargers ...

What made you go with PAC ?

 

[Marc s]

Oh God, I hate seeing that brand of "racing" valve springs ... I had one of their "racing" springs break in my heads/cam '07 Charger and it destroyed a piston, bent a valve, bent pushrod ... some nice damage ... and they were in there for about 3 yrs/~24k miles ... and working under their rated lift spec

I replaced them with PSI springs ... highly recommended for the 5.7/6.1 or stroker Chargers ...

What made you go with PAC ?

Your not going to find any spring that will live with high lift and long duration for 3 yrs and 24,000 miles. I went with PAC because PAC springs are used in almost all endurance and Nascar engines. I used PAC springs in all of my blown alcohol engines and never had a failure. Talk to any Comp Eliminator racer or Nascar engine builder and they will recommend PAC 1st and probably PSI 2nd.

Also, their 1300 series is much different than their 1200 beehive street car series. Saying PAC sucks is like saying, "why did you buy a 2013 Vette. I had a 1971 Vega and it was a piece of shit". They are both Chevy's so they must be the same quality right?

 

[46Tbird]

coil bind 1.150", lol

 

[Marc s]

The cam arrived last night. I now have all of the parts to start assembling the engine. I had the cam ground with the big split pattern between the intake and exhaust due to the cylinder head flow results and the ratio between intake flow and exhaust flow. 741/.798 lift 268/280 @ .050 with a 106LSA.

The cam card defaults to the standard Ford rocker ratio of 1.6. However, I am using 1.9 ratio Jessel's. This changes the lift to .741 intake and .798 exhaust. Since this engine has a 55mm roller cam bearings, I can use a cam with much larger base circles. This helps with lifter stability and helps keep the roller on the cam.
A properly designed high ratio system (say 1.9-2.2) will take less spring pressure to control the valve than a low ratio will. This is of course based on the assumption that the valve events/velocities (as mapped at the valve) through the cycle are the same for each. This is why it was developed in the first place.
Say you have an .800 lobe designed to be ran with a 1.6 ratio to achieve valve event timing and a certain valve velocity through the lift curve. You map this same lift curve and velocity, at the valve, in a .420 with a 1.9 ratio, you will get the same valve events and velocity, but have dropped the velocity of the rest of the moving parts (tappet and push rod) by x percent, thus enabling Nascar to run a smaller (lighter) valve spring with less pressure.
Also, the rocker has effectively been shortened on the push rod side increasing stiffness. Another added benefit is that the push rod side of the rocker is traveling less making for less movement in the push rod to cup area.

Anyway, this is why Nascar Cup engines use high ratio rockers instead of low ratio and bigger lobe lifts. It's all about slowing the lifter and pushrod down because they weigh much more than the titanium valve and spring. I will be running 210lbs more spring pressure over the nose than recommended. This should extend my usable RPM range to about 9100 RPM's.

I guess I will know soon enough if my theory and cam specs work.