426 wedge build

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Fisher

Fisher

Old Guy with a Cool car.
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Hey guys i am new to the forms and Mopars but not to the world of muscle cars. I have a 71 duster, and want to drop a big block in it. Nothing crazy, just a mild 425-450 hp wedge. The plan is to take a 383 block and drop in a 440 crank, making a 426. i am looking at a pump gas combo that will run to 6500 on 92 octane. This is going to be a budget build, with a rpm perforer dual plane, 750 dbl pumper . Not sure if i need to spend the money on Eddy aluminum heads to achieve this or can i do this with warmed over cast heads? I am going to run a solid flat tappet cam, and need to know how much compression can i run with the cast head and Duration at .050 needed to keep it from detonating? Any advice would be great.


Thanks In advance. Sheldon
 
If you're gonna be making a short decked 426 stroker, you won't need much to make 425-450 horse. I'm in the initial stages of dropping a 383 in my Scamp, and I'm looking for about the same power, but without the extra cubes.

With the extra displacement you shouldn't have much trouble making good compression even with flat tops and you could easily make that power with a set of 906 or 452 heads...and if I'm not terribly mistaken there are a couple sets kicking around in the classifieds, unless they've already been spoken for. Those heads with a good valve job, and some blending, about a 225* @ 050 cam, an RPM intake, and a free-breathing exhaust and I'm sure you'd have a bruiser...just gotta match it all up with a good stall and correct gearing.

There a tons of good folks on here that can help you reach/exceed your goal.
 
Yes, on the cast iron heads,a mail in.A good valve job(2.14/1.88s,never hurt),slight bowl work will nail it on airfloCam duration ,goes hand in hand with compression.Most people hate solids,they work well.What do you want to run for gear,converter,and octane? And ,what are you installing it in,and you expectations?
 
Just a quick question: is there any particular reason you really want to run a solid cam?
 
I am looking to run 3.91 gears, and a 2800 stall converter, nothing to radical. I want a solid cam because they still dont make springs that will pull to 6500 they all seem to fall of around 5800. Personal preference, i like solid cams thats all there is to it.
 
Good enough.Check out,Crower, Hughes, and Bullitt.Went the same route,more than once.Rough numbers that worked for me: 242/252, on a 112.narrow the lobe centers,for rumpety.I preferred the wide 112 I had it ground on.(yes, it was a solid,Crower custom).
 
Abodybomber said:
:glasses7:Told you.
Click to expand...

Whoa man, I never said I hated solid cams...I was merely curious about why he was partial to one. But thank you for calling me a hater...
 
I had a hydraulic roller in my 427 BBC and it fell on its face at around 5800 . It ran better when i had the comp 294S solid in it. Both solid and hydraulic cams have their place, its what your prepared to live with on the street. i was never under the valve covers all that much with any of my solids.
 
Abodybomber said:
Good enough.Check out,Crower, Hughes, and Bullitt.Went the same route,more than once.Rough numbers that worked for me: 242/252, on a 112.narrow the lobe centers,for rumpety.I preferred the wide 112 I had it ground on.(yes, it was a solid,Crower custom).
Click to expand...

With that Duration at .050 on a 112 lsa what compression did you run with cast heads? The whole idea is to make good power and keep the costs down. i am hoping for 9.5-1 to 10.0-1 on pump gas with steel heads.
 
Just a quick and dirty computation I worked with flat tops +.030" with 5cc reliefs, .008" in the hole, .040 head gasket w/ 4.38" diameter, 86cc heads would make 9.5:1...
 
@.050/ 9.6 real world comp.Ran great on 91 octane.16 inital timing,36 total @ 3000. Any good cam grider will work.
 
I love solids, so no arguement there. My Mph at the track says my 383 is making a little over 400 HP, and it has a tiny cam, junk stock rocker gear, iron heads, and your intake and carb combo. Don't do anything incredibly stupid and you will hit your goal easily.
 
You plan to machine the block to fit the crank, or the crank to fit the block? The mains do not just drop in ya know
 
I leave that all up to the engine builder. He has done this before, i think we are going to offset grind the crank.
 
Careful on offset grinding. It will affect the pistons you might use.
 
Well i pretty much assume this is going to be a custom build. I have to chat with the engine builder and see what he wants to do here. he has been doing this for 30 years so i am pretty sure he knows what he is doing. He has built all my other other motors over the last 20 years. He has several record holding engines in Stock Super stock and comp. He turns out some serious pieces.
 
I keep thinking, in your original post you said "budget" build, and 425 or so horsepower, so I keep wondering why you wouldnt have just built a stock stroke 440.... I bet after all the custom parts and machine work, you will have spent more money on your smaller motor.....
 
I might as well just build a 451 then? I want a 426 and thats all there is to it. The word budget is now out the window.
 
I don't see a budget,in the original post,still like solid flat tappets.
 
I have had every type of cam in various engines. The basic solid flat tappet has been the best to deal with, i love the chatter once you get them set.
 
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