Hey, yall I went to the yard and I'm way ahead of u . The yard I went to was a place my older brother worked at when he was a kid so the guy knew me . He cut me a good deal I took the whole top end off the motor. I got the stock TB ,intake and injectors . Including wiring , fuel rail and some sensors. He let me have it all for 75.00 and some labor. He needed help with welding frame connectors on a drag car he's building out of a old camaro. So after a late night out there I'm back and I got some good stuff to start with.

 

Oh, yeah one more question about the roller rockers steve . What is the stock rocker size ?
and what is the roller rocker size ? i was just wondering if doing this would add lift to the cam like going form 1.5 to 1.6 rockers on a chevy.

 

a different ratio rocker will make more lift at the valve

Cutting 1.5" off of the intake is recommended for a 5.9? does it really make a very noticable change in power? Planning on doing some mods, been reading quit abit and plans so far is 52mm Fastman and the intake mod. But was planning on letting the machineshop that does our race motors do the cutting and possible porting to the intake. I have read alittle on here and notice that the heads on the 5.9 are junk. what do yall recommend for a replacement? sry if im repeating questions.

 

the stock rockers are 1.6's, roller 1.6's will bump power by about 8 hp from my understanding. the 1.7's are the way to go.

cutting 1.5" off the runners will make the motor breath way better above 3500 rpms. recommended or not, I did it. VWandDodge Just finished doing his a couple of months back, you can search for his threads and in his signature are links to his engine saga. worth the read.

for replacement heads there is the heavy duty castings... hughes motors sells them built up with stock parts for around $720/pair. not too bad.

edit: humm, Hank, the 7577 # is for the carb version according to the site. was there another number?

 

It is the same number.
The carb base bolt pattern fits the stock factory Holley throttle body used on the 5.2/5.9 Magnums.

There is another aftermarket intake manifold similar to the AirGap advertised on eBay by a casting company. I can't remember the name right now.

I don't recommend cutting the kegger
(despite what Hughes Engines found on their dyno tests at high rpm)
but here is a picture:



Chrysler has been experimenting with long runner intake manifolds for a long time, as this photo from 727 auto trans expert John Kunkel shows:

http://albums.photo.epson.com/j/View...amp;p=64733905

'Father of the 426 Hemi" engineer Tom Hoover built one of the first 'long runner tuned ram intakes' and won his drag racing class back in the early 1960s.

You will notice nearly every modern engine has as long runners as can be fit in the engine compartment...that is definitely the trend and is related to the fact that engine designers are trying to keep 90% of peak torque over as long a range of rpm as possible.

If you had taken a 'power cycles' class in engineering 30 years ago in many university dyno labs they would have had a 'Council of Fuel Research' or CFR engine like is still used to test gasoline octane.

This single cylinder CFR engine would usually have a 'telescoping' pipe on the intake and you could set the engine at wide open throttle at a particular rpm and then 'telescope' the intake tube's total length and watch the torque on the dyno rise and then fall as your went past the 'first harmonic', then rise and fall again as the length approached the second harmonic.

This is the same idea as a "tuned" length of an exhaust header pipe.

 

I used no RTV when I replaced the gasket for my plenum pan. Did I do a bad thing?

 

I can't wait to find an extra kegger to cut and FILL...a step most manifold modifiers leave out. Filling the plenum with the right amount of aluminum putty increases the vacum signal, helping throttle response.

Someone got a kegger for a 2000 ram they want to sell reasonable?

 

my throttle response was fine... 52mm tb with the runners cut 1.5

my son& I went to the auto show a couple of weeks back and one of the mercedes on display had an adjustable runner design on their intake manifold... you got the best of both worlds with it, good low end and good top end. it was pretty slick...

I'm considering a jeep grand cherokee project and cutting the runners will definately be on the list of mods...

 

when you cut the runners you want to leave them at the same angle there at right? yall recommend cutting the center divider all the way out?

 

smooth them so there is a nice transition into the runner. if you cut it flat and leave it, there may be an issue but I cant say for sure. I took some dremel polishing wheels and cleaned them up that way. worked out real nice.