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Magnum engine head drilling fixture #3236397
06/02/24 08:12 PM
06/02/24 08:12 PM
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ILLINOIS
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volaredon Offline OP
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Is there one still floating around? I could use it.
How do I get my name on the list to have it sent here?

Re: Magnum engine head drilling fixture [Re: volaredon] #3236403
06/02/24 08:53 PM
06/02/24 08:53 PM
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fredericksburg,va
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cudaman1969 Offline
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I still have the one I made two years ago, no one wants to step up to the deposit that’s required.

Re: Magnum engine head drilling fixture [Re: cudaman1969] #3236466
06/03/24 09:39 AM
06/03/24 09:39 AM
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PA.
pittsburghracer Offline
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Originally Posted by cudaman1969
I still have the one I made two years ago, no one wants to step up to the deposit that’s required.




One of the members on forabodiesonly was a nice guy and started a pass around list. It didn’t go very far before another member stole it from him. Tread carefully. Get the replacement price for it plus any shipping up front before shipping it out. That way you can make a refund when it’s back where it belongs. Lots of dirtbags out there.


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.38@138.67


Livin and lovin life one day at a time




Re: Magnum engine head drilling fixture [Re: pittsburghracer] #3236476
06/03/24 10:09 AM
06/03/24 10:09 AM
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God's Country Maryland
GODSCOUNTRY340 Offline
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Drill for what?


I love the smell of Deer guts in the morning, it smells like... VICTORY!
Re: Magnum engine head drilling fixture [Re: GODSCOUNTRY340] #3236481
06/03/24 10:31 AM
06/03/24 10:31 AM
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fredericksburg,va
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cudaman1969 Offline
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Originally Posted by GODSCOUNTRY340
Drill for what?

To put LA intake on Magnum heads.
The deposit is $400, when and if the jig is shipped back and not messed up you get your money back less my shipping cost. Pitt Racer told me to do it that way.

Last edited by cudaman1969; 06/03/24 10:34 AM.
Re: Magnum engine head drilling fixture [Re: cudaman1969] #3236499
06/03/24 11:27 AM
06/03/24 11:27 AM
Joined: Feb 2005
Posts: 20,279
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pittsburghracer Offline
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Originally Posted by cudaman1969
Originally Posted by GODSCOUNTRY340
Drill for what?

To put LA intake on Magnum heads.
The deposit is $400, when and if the jig is shipped back and not messed up you get your money back less my shipping cost. Pitt Racer told me to do it that way.



It a shame people can’t be trusted and most can be but you have to protect yourself from the dirtbag thieves. They live amongst us.


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.38@138.67


Livin and lovin life one day at a time




Re: Magnum engine head drilling fixture [Re: pittsburghracer] #3236564
06/03/24 05:40 PM
06/03/24 05:40 PM
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ILLINOIS
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volaredon Offline OP
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Unfortunately I'm out, don't have $400 even if just being "held" til I return it .. but I get why you don't that way
I posted the same thing on FABO and got laughed off the post

Re: Magnum engine head drilling fixture [Re: volaredon] #3236569
06/03/24 06:01 PM
06/03/24 06:01 PM
Joined: Apr 2003
Posts: 12,435
Looking for a way out of Middl...
IMGTX Offline
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Looking for a way out of Middl...
This may be a little bit of work but could you mount an LA intake to a set of LA heads on a block bolting them down with old gaskets.

Mark the block and manifold so it can be realigned.

Install the Magnum Heads.

Align the LA intake to the block and heads.

Clamp the aligned intake to the block and heads so it won't move.

Use the existing bolt holes as a drill guide. Probably need to put a bushing in the holes to center the drill.

Another option would be to mark the head face to the aligned LA manifold. Then let a machine shop drill the bolt holes at 90 degrees to the face for you.

Could it work or is there more to it?

I would rather use the jig but when the money is tight I try crazy stuff.

Re: Magnum engine head drilling fixture [Re: IMGTX] #3236586
06/03/24 07:40 PM
06/03/24 07:40 PM
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ILLINOIS
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volaredon Offline OP
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Years ago I had a similar idea to what you're saying. I took a set to a machine shop with a set of LA gaskets and had them drill out a set of magnum heads as you said.
Problem is I later found out that LA heads aren't quite a straight up 90* to the intake manifold face on the head. They're actually 7* (or was it 9*?) off of straight perpendicular, upwards
So like 81*-83* from straight vertical.
I ended up using them on an engine as they were originally intended, a magnum with the original straight up manifold bolts.
Other choice is to hold out and hope I find a deal on a carb intake for a set of magnum heads as magnum heads were originally configured
"right now" that's further out of the question than the $400 deposit mentioned above.

I wish I could match op the other magnum head I have.
I have 1 bare NOS head I scored almost as cheap as the one I went after yesterday.
It was at a too good to pass on price at the Midlothian IL swap meet earlier this year. Brand new NOS and for $25 there was no way I wasn't bringing it home. Same guy told me of the 4" stroker crank he already sold earlier in the swap.
I saw it at the back of another swappers space with a tag on it as unbelievably cheap but I asked this 2nd swapped and he said I wasn't supposed to see it, he had just bought it himself that morning.

Re: Magnum engine head drilling fixture [Re: volaredon] #3236622
06/04/24 04:13 AM
06/04/24 04:13 AM
Joined: Jul 2003
Posts: 4,907
Holland MI Ottawa
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2boltmain Offline
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I asked my local machine shop owner who has been round since the 1990 if he could drill Magnum heads for the LA intake manifold mounting and I could tell he was not familiar with such concept.


Keep old mopars alive.
Re: Magnum engine head drilling fixture [Re: 2boltmain] #3236625
06/04/24 05:37 AM
06/04/24 05:37 AM
Joined: Jan 2003
Posts: 4,223
Canada -- Posts: 4034 -Registe...
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There used to be one floating around the forum years ago. Did it got stolen too or the owner gave up on lending it? I remember several people using it but did a quick search and couldn't find the posts.

Re: Magnum engine head drilling fixture [Re: volaredon] #3236672
06/04/24 11:14 AM
06/04/24 11:14 AM
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Posts: 9,034
fredericksburg,va
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cudaman1969 Offline
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Originally Posted by volaredon
Years ago I had a similar idea to what you're saying. I took a set to a machine shop with a set of LA gaskets and had them drill out a set of magnum heads as you said.
Problem is I later found out that LA heads aren't quite a straight up 90* to the intake manifold face on the head. They're actually 7* (or was it 9*?) off of straight perpendicular, upwards
So like 81*-83* from straight vertical.
I ended up using them on an engine as they were originally intended, a magnum with the original straight up manifold bolts.
Other choice is to hold out and hope I find a deal on a carb intake for a set of magnum heads as magnum heads were originally configured
"right now" that's further out of the question than the $400 deposit mentioned above.

I wish I could match op the other magnum head I have.
I have 1 bare NOS head I scored almost as cheap as the one I went after yesterday.
It was at a too good to pass on price at the Midlothian IL swap meet earlier this year. Brand new NOS and for $25 there was no way I wasn't bringing it home. Same guy told me of the 4" stroker crank he already sold earlier in the swap.
I saw it at the back of another swappers space with a tag on it as unbelievably cheap but I asked this 2nd swapped and he said I wasn't supposed to see it, he had just bought it himself that morning.

The angles is the reason I made my jig off of an LA head, took over a day to make it (@$50 an hour for 8 hours) plus $ for materials. Most of the 8 hours were taken up by figuring out design and what bits-cutters were needed plus procedure of operation. But like Pittsburgracer said some will steal your stuff.

Re: Magnum engine head drilling fixture [Re: cudaman1969] #3236873
06/05/24 06:11 PM
06/05/24 06:11 PM
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Posts: 12,560
Kalispell Mt.
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HotRodDave Offline
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Originally Posted by cudaman1969
Originally Posted by volaredon
Years ago I had a similar idea to what you're saying. I took a set to a machine shop with a set of LA gaskets and had them drill out a set of magnum heads as you said.
Problem is I later found out that LA heads aren't quite a straight up 90* to the intake manifold face on the head. They're actually 7* (or was it 9*?) off of straight perpendicular, upwards
So like 81*-83* from straight vertical.
I ended up using them on an engine as they were originally intended, a magnum with the original straight up manifold bolts.
Other choice is to hold out and hope I find a deal on a carb intake for a set of magnum heads as magnum heads were originally configured
"right now" that's further out of the question than the $400 deposit mentioned above.

I wish I could match op the other magnum head I have.
I have 1 bare NOS head I scored almost as cheap as the one I went after yesterday.
It was at a too good to pass on price at the Midlothian IL swap meet earlier this year. Brand new NOS and for $25 there was no way I wasn't bringing it home. Same guy told me of the 4" stroker crank he already sold earlier in the swap.
I saw it at the back of another swappers space with a tag on it as unbelievably cheap but I asked this 2nd swapped and he said I wasn't supposed to see it, he had just bought it himself that morning.

The angles is the reason I made my jig off of an LA head, took over a day to make it (@$50 an hour for 8 hours) plus $ for materials. Most of the 8 hours were taken up by figuring out design and what bits-cutters were needed plus procedure of operation. But like Pittsburgracer said some will steal your stuff.



The early 273 bolts are almost straight in, the 67 and later LA engines all used on angled up a little.

I made a jig to do one hole at a time and it was quick and easy to make and use just clamp it to the head with some welding clamps and use with a spacer to clamp under it for the outer bolts, line it up with a flashlight looking at the old magnum bolt holes, just move from one hole to the next. Using the intake for a guide is hard because you cant get a drill straight in to the ones near the carb pad, some intakes are easier than others.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Magnum engine head drilling fixture [Re: cudaman1969] #3286784
02/03/25 05:54 AM
02/03/25 05:54 AM
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Holland MI Ottawa
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2boltmain Offline
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Originally Posted by cudaman1969
I still have the one I made two years ago, no one wants to step up to the deposit that’s required.


Cudaman- is your jig reasonably fool proof? I have no issue paying the deposit, but I hate having to rely on myself to measure and carefully locate a jig for holes needing to be drilled. I often have to elongate holes I drilled in brackets and such to make them match up. I don't have the option elongate anything in the case of drilling cyl heads. Does your jig position the tap correctly to cut the threads? Could you post a pic of your rental jig? Or if you prefer, I could send you my private Gmail address and you could send pics there.

Last edited by 2boltmain; 02/03/25 06:01 AM.

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Re: Magnum engine head drilling fixture [Re: 2boltmain] #3286955
02/03/25 06:36 PM
02/03/25 06:36 PM
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Posts: 9,034
fredericksburg,va
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cudaman1969 Offline
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Originally Posted by 2boltmain
Originally Posted by cudaman1969
I still have the one I made two years ago, no one wants to step up to the deposit that’s required.


Cudaman- is your jig reasonably fool proof? I have no issue paying the deposit, but I hate having to rely on myself to measure and carefully locate a jig for holes needing to be drilled. I often have to elongate holes I drilled in brackets and such to make them match up. I don't have the option elongate anything in the case of drilling cyl heads. Does your jig position the tap correctly to cut the threads? Could you post a pic of your rental jig? Or if you prefer, I could send you my private Gmail address and you could send pics there.


Funny, I was looking at it Saturday. I’ll get some new pictures of the jig. I erased the previous pics because of no interest. I made it so it self aligns by the person setting it up. I’ll explain on each pic. Give me a few days.

Re: Magnum engine head drilling fixture [Re: cudaman1969] #3287015
02/03/25 09:41 PM
02/03/25 09:41 PM
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volaredon Offline OP
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I finally got a 4bbl intake that directly bolts to the magnum heads

Re: Magnum engine head drilling fixture [Re: cudaman1969] #3287043
02/04/25 05:09 AM
02/04/25 05:09 AM
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Holland MI Ottawa
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2boltmain Offline
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cudaman1969
Appreciate the pics and explanation.

Last edited by 2boltmain; 02/04/25 05:10 AM.

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Re: Magnum engine head drilling fixture [Re: 2boltmain] #3287782
02/07/25 05:36 AM
02/07/25 05:36 AM
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Holland MI Ottawa
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2boltmain Offline
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So in 2023 I bought some iron EQ Magnum cyl heads from Vegas parts and cores. They have a decent reputation. These heads come drilled for the LA intake manifolds. This is the only reason I bought them as I plan to run a tunnel ram and two 500cfm Edelbrock's. These heads are a shadow of what they were when made in Australia but I planned on porting them so that would remedy their poor casting of the port shapes. They are full assembled - the pair was $1000 shipped. I immediately took them to Holland Automotive and machine and had them inspected. The valve guide clearance was spot on. The valve seat and sealing surfaces were spot on. Installed valve height was spot on. Quality of components was high even though I bought Hughes springs, retainers and locks. Passing the smell test I then had them machine down the valve guides to clear a higher lift cam (HYD Roller- Magnum engine) Then I began a commonsense port and polish. I got more than halfway done when I found a post on FABO. A member there bought the same heads. he discovered the drilled holes in the wrong location. Or at least things don't line up! He was able to get a full refund. credit to him for checking this IMMEDIATLEY upon arrival of the heads. I on the other hand am $#! out of luck. Here is a video by a great Mopar guy that explains the situation. Ill post my pics for those who cannot view a YT clip.
https://www.youtube.com/watch?v=zJdet4ZDBV8&lc=UgwLHQmFf8KIxiahxvN4AaABAg.AE5QOwGgE9zAE7HXV3ufFl
I'm not pleased to have to get ANOTHER set of magnum heads- used or new- have them inspected by a shop- have the guides cut down for higher lift-then drill them for an LA intake. THEN......begin the street port and mild polish AGAIN.

Last edited by 2boltmain; 02/07/25 05:37 AM.

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Re: Magnum engine head drilling fixture [Re: 2boltmain] #3287783
02/07/25 05:45 AM
02/07/25 05:45 AM
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Holland MI Ottawa
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2boltmain Offline
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Heres two pics of my heads. When I bolt an intake to them the alignment is a mess.

IMG_20250118_153047605.jpgIMG_20250118_153125134.jpg

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Re: Magnum engine head drilling fixture [Re: 2boltmain] #3287786
02/07/25 06:11 AM
02/07/25 06:11 AM
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Holland MI Ottawa
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2boltmain Offline
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Sorry the pics are big and not right side up. Here is the Weiand TR bottom bolted to one head. FYI- Goal is a 330-350 HP mag 360. Nothing radical. I want the looks to be radical but I don't care that it wont run 11s-or 12s or..... I just want reliable and looks good. No drag strip -summer toy recreational driver only.

IMG_20250118_154219087_HDR.jpgScreenshot_20241011-052929.png

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