Ported Magnum Heads, Pushrod Pinch Removed

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turboking15

turboking15

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Location
Columbus, Oh
This post is to show a project that ive been working on for a while now, i am still not finished but i am close enough at this point i think i can share it. Before anybody says, why waste your time with stock heads and all that jazz, i know. Lol. This was more an experiment to see if I could pull it off and see how cheap i could do it.

Heres the details.
- magnum heads
-2.02 1.60 stainless valves, 8mm stems, w/ VJ
- filled in pushrod void with ZA-12
- relocated pushrod "tunnels"
- Modified jesel rockers from 18* chevy heads
- Behive springs
- Lots of time porting

Pics to follow and i will answer questions as they come about. This has been a pretty fun project, hopefully they will work decently when done. If not, im only out some time and money that has been spread out over a year and a half.

Enjoy.
 
Pics

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I have more pictures from the early stages of this project but they are on my old phone, ill try to dig them out tonight.
 
PRH said:
Nice job:thumbsup:

Any before/after flow numbers?​
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Before is whatever stock magnum heads flow as these were untouched when i started. I dont know of anybody close to me with a flow bench otherwise i would. (anybody in the central ohio area have a flow bench? lol)
 
turboking15 said:
Before is whatever stock magnum heads flow as these were untouched when i started. I dont know of anybody close to me with a flow bench otherwise i would. (anybody in the central ohio area have a flow bench? lol)
Click to expand...
ship one to Mr PRH, I'll pay for the return shipping if he'll flow them.
 
Baxter61 said:
ship one to Mr PRH, I'll pay for the return shipping if he'll flow them.
Click to expand...

I’d be fine with that.
But I have to believe there’s a flow bench within a reasonable drive from Columbus, Oh.

What intake manifold is that?

I have basically zero experience with stock magnum heads.
What would be considered pretty good numbers out of some porting on oe magnum heads where the pinch was still there?
 
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PRH said:
I’d be fine with that.
But I have to believe there’s a flow bench within a reasonable drive from Columbus, Oh.

What intake manifold is that?
Click to expand...

Im working on finding someone with a bench.

Intake is an M1 single plane. P4532851
its been port matched and i converted the carb pad to a 4150 flange.
 
Mopar M1 with LA small block bolt pattern, Magnum thermostat and bypass hose, and no fuel injector bosses cast in. Amazing how many different configurations were offered for the small block and Magnum M1 intakes. That will accept the Magnum timing cover and serpentine drive setup nicely.

Excellent choice of heads to experiment on. Very easy and cheap to get a replacement if something goes wrong. Enjoying this. Keep up the good work.
 
Without before and after numbers from the same bench you are throwing darts at a dart board.
 
I hope there is some details on what was done.....
:poke:
 
As well as moving the pushrods over and that Jesel mod is cool. It’s bucks I don’t have to do this stuff with but it is really wild you did this and I’d like to know. Very very interesting mods.

On the Jesel stuff, it appears that you made an insert and re drilled the hole. Correct? I’d so, what was the insert made of and etc... Rocker off set?

The pushrod tubes were blocked off with a solid metal stick? for a lack of better wording. land then you re drilled them over by how much?

This is really interesting turboking.
 
Here are some of the pictures from the early stages of this process. The mag intake holes are filled with the za-12 as well. I used some plates to block the bottom open sections where the rockers go, and the intake flange. We preheated the head as we were melting down the za-12 ingots, once we poured it it filled in the cavity and intake holes. Before we poured them i mocked up the valve train to get a rough idea of where the new pushrod tunnels needed to be, and that was just a bunch of test fitting and grinding to find the new locations. Once those were created i rtv'd 1/2" wooden dowels in the new tunnels to hold shape during the pour. Afterwards they were chased out with a drill. I then later drilled them slightly larger and used some k&s tubing to sleeve the holes.

As for the rocker stands i turned up some offset bushings to locate them properly and go from the 3/8 bolt hole to the 5/16 bolt hole. As for the offset, i believe they are .550 on the intake and .080 on the exhaust, i will have to double check that. As far as the money goes, i surely did not buy these new just to cut them up. I got a stupid deal on them from a circle track guy cleaning shop. Paid $180 shipped for em!!! That was what really got the project started and moving from more than just a pipe dream.

Keep the questions comming! Enjoy.

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Very cool thread! Nice looking work. How well does the
za-12 adhere to the iron? Will it work with aluminum heads?
You got my wheels a turning......
 
Mopar Sam said:
Very cool thread! Nice looking work. How well does the
za-12 adhere to the iron? Will it work with aluminum heads?
You got my wheels a turning......
Click to expand...

Quite well, i actually got the idea from an oldsmobile buddy of mine, they have been using this stuff for years to fill the exhaust crossover in their heads. As long as you have a clean and rough surface i dont see why it wouldnt work on aluminum heads.
 
turboking15 said:
Quite well, i actually got the idea from an oldsmobile buddy of mine, they have been using this stuff for years to fill the exhaust crossover in their heads. As long as you have a clean and rough surface i dont see why it wouldnt work on aluminum heads.
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How many ingots did you use?, and what size were they? Thanks!
 
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