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#1
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273 and Magnum heads?
Will the new Magnum heads off a 360 work on a 273, or is the bore too small?
Thanks Jeremy |
#2
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The bores too small, plus they oil throught the lifter and pushrod so more parts would be involved to do this swap.
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#3
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I thought you could just bolt on the Mag heads on the LA blocks?
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#4
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They will but they oil through the lifter and the push rod not through the rocker stands like LA engines. That's one of the hidden coast that makes this conversion not worth it not to mention 475 a piece for new heads from the dealer. Plus the LA intake wont fit the mag heads without mods to the bolt holes. LA's mount the bolts at an angle and mags bolt straight down through the intake. There's some more money to spend to mod the intake that can only be used with those heads from that point on. Just aint worth.
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#5
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Best use for Magnum heads is on the 360 LA, next best use is on the 318. The heads have the small combustion chamber like the 318 heads, large valves like the 360 heads, and great flow characteristics. Intake manifolds are now available that will fit both LA and Magnum heads, and at a decent price.
Why use a 273 when the 360 is the same exterior size? Sneak in the 360 and just tell people you still have a 273. |
#6
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bore is to small for magnum
The valve sizes 1.92" 1.625" = 3.55" The bore of a 273 is 3.625 leaves .080" for the valves to fit in bore.
As far as what dwc43 says just dismiss as bad info on parts cost. dwc43's dealer is hosing him, the heads can be had for 325.00 the 1.6 rockers are 65.00 pushrods 40.00 from mopar, the lifters from PAW/Summit for 60.00. dwc43 is biased against magnum heads for some reason. The intake there are two options M1 for about 230.00 or modify a aluminum intake. Not tough really all you need is a tube the bolt fit in cut at a angle to match intake other end flat. might need to clearance bolt hole intake is still usable for LA engine. Edelbrock is making a magnum intake soon check with them. in conclusion dwc43 is wrong about magnum heads most other things he does have good info just be cautious with his info. |
#7
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Not wrong on this at all. They are too big for a 273. No low end. M1 no low end. Bad choices for a little engine that needs all hte low end it can get. Look at Dons Cuda running in hte low 11's with 318 heads.
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#8
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dwc43
Yes your wrong the magnum head will bolt onto but no room for valves. the ports are to big make up your mind first there to small 318/360 now there to big for 273 you are a tower of misinformation. The M1 is a single plane and a dual plane. yes and Don's Cuda is a very well sorted car. I have the utmost respect for Don, you on the other hand scare me !!!!!!!!
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#9
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I never said that they wont bolt on./ I said they needed mods. ans that they would bolt on, but there was no block oiling for them and that is true. I also said that the intake on bolt on without a swap. You need to reread the posts I wrote. the are to big for the 273. The 318 can be better served with a different head. You need to reread what I said. There's still better options for the 318 and 360's than the mag head.
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#10
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dwc43
What mods are needed to bolt up the magnums heads a lifter change ohhhhhh and pushrods and new 1.6 ratio rockers the head gasket is LA still and M1 dual plane and your done. explain all the mods.
as usual your veiw point is hampered by that narrow mind. |
#11
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If you'll reread the post above you'll see all that. Amc lifters, pushrods, moded intake bolt holes and all. The m1 looses too much bottom end. Might make a good drag race piece, but it stinks on the street. Go ask the truck forum guys how much bottom end they loose with it. They dont even like it, but still use it. That dont make a lot of since either though. Plus one you mod the la intake to fit hte mag heads that's all it's good for then. Not like you cn change it back for la use anymore. We swap intakes a lot. I'm not about to shell out lots of money so I can have 4 or more intakes for each engine that we use. Better things for us to use than mag heads with a lot less cost.
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#12
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dwc43
the truck forum ????? what are you talking about the beer barrel intake is to make torque to move a 5000+ truck with a single plane of course it will lose torque. As far as you mindless drivel you posted huhhhhhh.
So now the magnum head makes horse power help me with your confused thinking first their no goood for torque then no good for hp now back to no good for torque. you must have a flip flop mind not able to make a coherient thought. Oh by the way were are 909dusters pic's of your trophies. The "tube" allows you to use the intake on both LA and Magnum heads. |
#13
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There's no flip flop at all. The are too big for the 273, that's all. They are not enough for the 360. Period. No flip flop.
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#14
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where are 909's trophy pics you were to post
You are a rare person, in your mind anything new is junk. After almost 40 years there are no better heads for LA engine than "X" heads when they dry up then what are you going to do ????
Then explain why my 365 ci made 430 pft of torque and 370 hp. You can only claim they don't work. I have dyno sheet posted and with stock magnum castings mild cam, dual plane. 625 cfm demon carb. All you have is superheated air to back up your statments. Back it up with some kind of proof, come on !! or are you just all windbag.... You never have tried to recant W8Dart375 or did you even read his posts |
#15
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Quote:
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#16
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The small bore
With a 3.625 bore there may not be enough bore for the valves to move near the cylinder bore?? With only .080" there might be a valve to bore clearance problem you'll need to check before completing swap.
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#17
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I would run a ported 302 head probably with a 2.02" valve and notch the cylinder walls on a 273 if I HAD to build one.....
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#18
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I agree with W8Dart, except I would probably stay with the 1.88 intake on a 273.
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#19
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Do you think I could just run some smaller vavles?
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