TIMINATOR

OOPS!!! My bad, I knew that! I've had a bunch of those apart too....
We all thank you. I should re read before posting. I will attempt to redeem myself later, if possible, mebbie....TIMINATOR

Whipped383

So my thought is maybe get a billet oil fill cap and tap it and use an inline pcv to the manifold somewhere. Good idea?

Whipped383

Well I picked up a spare intake manifold and cut it open today. Much to my surprise it had no baffle in it.
So that's the stock choke point.
There's the floor cut out ready to cleanup and port. Its really starting to open up
Got my helper. Gotta start her young she's 15 months old

Whipped383

So I'm wanting to also modify the stock pcv system while I'm doing these mods.
The stock one is just that little tube sticking out the center of the plenum. Its just an orfice, then the breather side has a passage that goes up and through the throttle body.
My plan is to weld up the hole where the office is. Then tap a hole highlighted in blue and install a threaded pcv valve. Then run a short hose up to the already threaded hole highlighted in red. Anyone have any thoughts or opinions on doing this?

TIMINATOR

A few observations. There aren't any "baffles" per se, but there is sound engineering involved in how the intake is made. Clue: as cast, the plenum exit to the runners is at the center of the runner inlets, not equal length to all, but as close as the factory deemed necessary for a lo perf truck. The so called 55mm "Choke point" is much wider than the 75mm (actual butterfly size) throttle body, so its not that big of a deal to the airflow. There are a few other issues and "choke points" though. Chevy is consistent in the errors made with this manifold as with the Cross-Fire and the Tuned Port units. I'll post when I get thru flowing each part and the entire thing together, and modded. I have ideas, a Superflow 600, and over 40 years of experience. I am currently constructing flowbench adapters to ensure repeatable results, before I do any chopping. Remember: raw flow and volume don't always equal Horsepower. From all the mods I have seen so far, there is flow and Horsepower left on the table. "I intend to correct that," he said modestly..... TIMINATOR

Whipped383

Some of them do have baffles look around dude. I dunno why your such a pro on how to modify these i don't see any pics of your work. I'm just taking what raylar and already proven and mimicking it. Of you think you can do better good luck

TIMINATOR

Copying others work didn't get me thru school, or life and it won't make me more successful. Its settled then, I'll sell my work, not give it away. No pics, flowbench or dyno results. I'll crawl back in my hole and watch. Mebbie even giggle. David Vizard told me about 25 years ago: "You will never get any knowledge from any of my articles or books that is any newer than 4 to 5 years old and hasn't been significantly improved upon, otherwise no one would have to pay me for my work." I keep forgetting that in everyday life, even though I keep it in mind when professionally writing. Thanks for the reminder. TIMINATOR

Vindii

Sigh...

Raylar Engineering

Looking really good whipple, now you can see what I mean about the loss of volume and added heat thanks to the baffle / plate that forces the air into the lifter valley.

You may want to smooth the inside down where you removed the plate with a grinder and a sanding roll so its a nice even transition on the inside. Don't worry about the runners or port matching the heads, the gaskets don't line up and you'll lose intake velocity.

Make sure that afterwards, you wash the HELL out of the inside of the manifold. The intake manifolds are cast using styrofoam which makes anything gritty *really* like sticking to the remnant casting black "goo" that is all over the inside of the plenum and runners.

We've had more than a few boat guys call us after having their stock intake manifolds sand blasted / powder coated with ruined engines - the sand got into the black goo and then made its way into the engine under WOT, NOT GOOD!

Here's the back to back dyno testing on the same vehicle with before and after dyno curves on this mod with our 540 engine (iron heads, 203 cam, roller rockers, shorty headers):



Figure 25hp and minimal peak torque gains with substantial power band improvements.

As a side note, don't even worry about the 90mm throttle body until you aftermarket cylinder heads as the stock heads don't flow enough air to warrant the larger throttle body.

d-bo71

Sigh is right, it sad that Raylar has a proven mod here instead of saying there isn't a baffle or there isn't a choke point in the IM how maybe saying I'm going to try and improve the IM mod I have some ideas or something like that. it's also hard to believe in someone when ridiculous stuff comes out of their mouth like " mufflers made a better improvement than headers" are you serious?