Magnum replacement heads?
- Thread starter Jonnylightening
- Start date
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ChargedDart75
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PRH
Well-Known Member
It’s an LA head.
Here......I’ll rephrase what I said......
If I were looking to put together a performance oriented build(as opposed to needing to replace some cracked original magnums on my pick up)......and one of the heads I was considering was the Speedmaster Magnum replacement head, I’d spend the extra $16/pr and use their aluminum LA heads instead.
Here......I’ll rephrase what I said......
If I were looking to put together a performance oriented build(as opposed to needing to replace some cracked original magnums on my pick up)......and one of the heads I was considering was the Speedmaster Magnum replacement head, I’d spend the extra $16/pr and use their aluminum LA heads instead.
ChargedDart75
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PRH
Well-Known Member
Well...... maybe a member here with a flow bench will be curious enough about this current crop of magnum replacements to get a set and start fiddling with them........ and post the results.
I’d be curious to know(but def not curious enough to buy some) if they are actually a newer revised casting that has 179cc-ish intake runner volume(like advertised)....... or if it’s the same basic casting that Jesse fooled with a few years back that was only like 152cc, and wasn’t any more of a “performance” head than a stock Magnum head.
At some point...... I’m sure there will be answers.
If Indy re-releases the LAX/MAX head....... those will probably end up being a better option for a performance oriented build.
Of course...... there’s also the Ede Magnum Head.
I’d be curious to know(but def not curious enough to buy some) if they are actually a newer revised casting that has 179cc-ish intake runner volume(like advertised)....... or if it’s the same basic casting that Jesse fooled with a few years back that was only like 152cc, and wasn’t any more of a “performance” head than a stock Magnum head.
At some point...... I’m sure there will be answers.
If Indy re-releases the LAX/MAX head....... those will probably end up being a better option for a performance oriented build.
Of course...... there’s also the Ede Magnum Head.
ChargedDart75
Well-Known Member
I wish Speedmaster or somebody would come out with a decent Aluminum Magnum head, or Edelbrock would get the QC up to snuff again. I haven't been impressed with the Eddy heads I've seen lately.
Picked up the cast iron speedmaster heads today......look nice in a plastic bag....lol
dropped off a 360 crank to get polished....said I can pay went i pick up the crank....nice guys...
Thought if you used PRW rockers that oil thru the pushrod ...you can use the LA head on the Magnum block?????s
dropped off a 360 crank to get polished....said I can pay went i pick up the crank....nice guys...
Thought if you used PRW rockers that oil thru the pushrod ...you can use the LA head on the Magnum block?????s
ChargedDart75
Well-Known Member
You can use any rocker that oils through the pushrod, not just PRW. Some early Magnums have the oil passage to the head, so they can use standard LA rockers.
RW rockers as an example.....yes...any rocker that oils thru pushrod..should work
Brian Hafliger
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Oogliboogli
I need new heads for my 4x4, perfect excuse. Should be here in a week .
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Oogliboogli
Mine showed up this morning.
Seem legit so far.
The bowl cutting they did was unnecessary.
First thought is 2.02 will fix that.
I was thinking I'd use a 1.94 11/32, but i have 2.02. I'll start my own thread. Going to flow test them as is when i get a stock int/exh valve, then port and test.
Seem legit so far.
The bowl cutting they did was unnecessary.
First thought is 2.02 will fix that.
I was thinking I'd use a 1.94 11/32, but i have 2.02. I'll start my own thread. Going to flow test them as is when i get a stock int/exh valve, then port and test.
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Oogliboogli
Probably...and probably in the near furture.
Things are so cheap, ive learned long ago that picky is the man who can't do the work himself. Not a knock on anyone, but these are what speedmaster aluminum is to reg eddy aluminum.
Nothing wrong with them at all, for magnum heads. Lol... I'm partial to LA shaft mount stuff. They also weigh less than a rhs, i have the rhs to know. Its all in the ends and lack of shaft bosses im guessing. Decide for yourselves of course.
thomasfouraker
Well-Known Member
Do the pushrod guides seem thick enough to pull them back to open that intake port opening some?
Anxious to see these get worked!
Also, those RHS heads you have, are they the MAx or LAx heads and have you gotten flow numbers off those?
I want to send you a set of my RTs to flow then see what you can get out of them. I am sure you have seen sets before but there isn’t a lot of meat left to trim the pushrod pinch down on these.
PRH
Well-Known Member
I’ll be curious to hear what the as cast intake runner volume is.
It certainly doesn’t “look” as big as 179cc.
It certainly doesn’t “look” as big as 179cc.
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Oogliboogli
Totally agree that pics on the net are sometimes deceiving.
They are much bigger than a regular magnum head. I need a couple stock valves to measure and bench them.
In my honest opinion there is absolutely no way in hell would i run these out of the box as an assembled head from SM..
Under the valve job is butchery. I dont expect them to flow as they should with this kind of intake port but they might still move at a higher lift.
Jonnylightening
Well-Known Member
I know my EQs needed a good bit of work. I had Mike at B3 look at em. He drilled them for 7/16 rocker studs but also had to relocate them to get them correct geometry wise. Keep us updated on the speedmaster though. I may get a set come black friday.
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Oogliboogli
Absolutely.
I'll probably buy an aluminum LA set for another project.. but for my truck, that i use for work ,and has that big mount bracket and all those accessories like a/c & ps.. bolt on is what i need. The Machine they used to cut them.. tons of them, no wonder. Im going straight to 2.02/1.60 valves. Should have them on the flowbench tuesday/weds. But its just a 4x4 truck, if i just blend them and they happen to flow 250 or 260, good enough...maybe.
RAMM
Well-Known Member
Just looking at the pics you provided I can say with 90% surety that those are one and the same CCCN Magnum replacement heads AKA Chinesium. I cannot see them approaching 250-260 cfm without a TON of work. I can still order those from my supplier and revisit them but until I get struck with a masochistic urge I won't. J.Rob
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Oogliboogli
They're all chinesium, thought we've grasped that by now. Hey and you were just working on some x heads, those need much ssr work to hit 270. These you dont have to spend tim on the massive guide.
Next to a cracked mag head at the shop, the intake port is a lot bigger and has a better floor approach. You can put your middle and ring fingers right over the ssr, its pretty Wide. Other than that, they have the same massive pinch and they do NOT have the material to open them up like a RHS head, which i also have.
With the 2.02 i don't see it as being difficult or a ton of work, so ill use that as motivation.
With marginal type parts, if theyre better in some way.. i keep the optimism charged till the final word is in. Keep in mind there were a ton of people on this site claiming a stock mag head was superior to a j head and that "250 cfm was easy".
250/260 should be cake. Ordering some pro max pretty soon.
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NC Engine Builder
Grumpy Old Man
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Interesting thread!
PRH
Well-Known Member
An ootb RHS Magnum Head with an SI brand “port flow” series 1.92” valve on my bench:
4.00” bore/28”
Lift——flow
.100— 66
.200—117
.300—171
.400—217
.500—245
.600—253
4.00” bore/28”
Lift——flow
.100— 66
.200—117
.300—171
.400—217
.500—245
.600—253
thomasfouraker
Well-Known Member
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