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Re: 440 vs hemi ? - how do the blocks differ?
[Re: nutso suave]
#795226
09/07/10 01:28 AM
09/07/10 01:28 AM
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Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
i was looking at the stage V website and i saw you can buy hemi conversion heads for your 440 or 383. how do the blocks differ? i ought to know, but i confess that i don't. the bore is listed as 0.10" smaller with the same stroke.
4.25" 3.75" - 426
4.32" 3.75" - 440
are there any other differences other than the bore? and stampings, obviously.
The head bolt pattern is the big one and Hemi's had cross-bolted mains.
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: nutso suave]
#795227
09/07/10 01:29 AM
09/07/10 01:29 AM
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Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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IIRC
a HEMI has 5 bolts around the cylinder and cross bolt mains.
a 440 only has 4 bolts around the cylinder..
I am truckless..
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: 340SHORTY]
#795232
09/07/10 09:13 AM
09/07/10 09:13 AM
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JohnRR
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Quote:
IIRC
a HEMI has 5 bolts around the cylinder and cross bolt mains.
a 440 only has 4 bolts around the cylinder..
No , all big blocks have 5 bolts around the cylinders , smallblocks only 4. the inner row of bolts is up higher and slightly offset between the wedge and the hemi .
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: IMGTX]
#795233
09/07/10 09:18 AM
09/07/10 09:18 AM
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JohnRR
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Quote:
Hemi heads will bolt onto a 440 block except for the bolts along the lifter valley. The Hemi intake ports sit right over those holes so they moved the holes into the valley an extra 1/2 or so to allow the bolts to be accessed from underneath. In effect the 4 bolts (studs) in the lifter valley go up into the bottom of the head while all the others go down through the head into the block,these studs are threaded into the intake ports and need sealer on them.
Also the lifter valley had a deeper groove cut into it to allow the intake pushrods to miss the block since they were at a different angle. There are separate holes thru the deck for the exhaust pushrods.
Lastly the corners of the Hemi heads had drain tubes to let the oil drain back into the oil pan. The 440blocks have no provision at all for the drain tubes.
The other differences are the 4 bolt mains and the original hemi has no mounting ears for motor mounts. They use flush mounted motor mounts. Some current production blocks have both.
This pretty much sums it up , I expanded further on a couple of the lines ...
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: nutso suave]
#795237
09/07/10 01:02 PM
09/07/10 01:02 PM
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Joined: Apr 2003
Posts: 12,234
Looking for a way out of Middl...
IMGTX
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Over the years there have been multiple conversion kits. Some for Big Block Chevies (not even close to mopar parts in that kit.) I remember a 383 done in a car mag back in the late 70's early 80's. They added a tube along the side of the block for the oil drain back and did a few other changes to accommodate the valve train. As long as you don't break a part then you were OK but if a unique part breaks and the company is gone your in trouble. IF you can find an aluminum head (aluminum fixes pretty easily) that uses stock valve train it would be OK. For me it will be the day after the company goes out of business that a no longer available rocker arm would break. 
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: nutso suave]
#795238
09/07/10 01:08 PM
09/07/10 01:08 PM
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Joined: Jan 2003
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JohnRR
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Quote:
thanks again, very informative...i knew they were similar but not interchangeable. here is a link to the 440 hemi heads...i might have to get me some. how do these stage V hemi heads compare to aluminum eddy heads? do you have to buy a special intake from stage V or will any hemi intake bolt on? 
linky: http://www.stagev.com/pages/hcheads.html
You still have to get a custom piston and a longer set of rods. There is another thread on this, it's maybe 10% cheaper to do it this way and in the end you still end up with a weaker lower end . Other than the head and special stage 5 rocker assembly it uses all other hemi specific parts.
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: IMGTX]
#795239
09/07/10 01:28 PM
09/07/10 01:28 PM
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Joined: Jan 2003
Posts: 11,500
delivering your oil
nutso suave
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OP
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Quote:
As long as you don't break a part then you were OK but if a unique part breaks and the company is gone your in trouble.
IF you can find an aluminum head (aluminum fixes pretty easily) that uses stock valve train it would be OK. For me it will be the day after the company goes out of business that a no longer available rocker arm would break.
no doubt!
JohnRR -
interesting...it seemed like you could just bolt them on by reading the website. it would just be cool to have a 440 hemi. 
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: nutso suave]
#795241
09/07/10 01:44 PM
09/07/10 01:44 PM
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Joined: Jan 2003
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JohnRR
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Quote:
JohnRR -
interesting...it seemed like you could just bolt them on by reading the website.
I think that's what many think because you see this question time to time . These had had their time before Hemi blocks became readily available .
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: nutso suave]
#795242
09/07/10 02:02 PM
09/07/10 02:02 PM
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Joined: Aug 2003
Posts: 4,481
Mesa, AZ
Pat_Whalen
super gas
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super gas
Joined: Aug 2003
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Mesa, AZ
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Quote:
thanks again, very informative...i knew they were similar but not interchangeable. here is a link to the 440 hemi heads...i might have to get me some. how do these stage V hemi heads compare to aluminum eddy heads? do you have to buy a special intake from stage V or will any hemi intake bolt on?
linky: http://www.stagev.com/pages/hcheads.html
From their webpage:
Quote:
The intake port openings on all Conversion heads are 10% large than stock for enhanced breathing and stock Hemi manifolds bolt right on.
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: JohnRR]
#795243
09/07/10 02:05 PM
09/07/10 02:05 PM
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Joined: Jan 2003
Posts: 11,500
delivering your oil
nutso suave
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it started over in the general forum, about making a 383 hemi, and then i just got curious...i think the eddy packages are pretty unbeatable for bolt on power value. i'd just love to see some self professed expert's face at a cruise-in when i showed him my 440 hemi. edit: Quote:
From their webpage:
Quote:
The intake port openings on all Conversion heads are 10% large than stock for enhanced breathing and stock Hemi manifolds bolt right on.
i read that, but i wasn't sure if it was exhaust manifolds or intake or both.
Last edited by nutso suave; 09/07/10 02:14 PM.
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Re: 440 vs hemi ? - how do the blocks differ?
[Re: nutso suave]
#795244
09/07/10 03:38 PM
09/07/10 03:38 PM
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JohnRR
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Quote:
i'd just love to see some self professed expert's face at a cruise-in when i showed him my 440 hemi.
All you have to do is bore the 426 block .070 over , it's 440 cubic inches ... but I get what you are saying.
Quote:
Quote:
From their webpage:
Quote:
The intake port openings on all Conversion heads are 10% large than stock for enhanced breathing and stock Hemi manifolds bolt right on.
i read that, but i wasn't sure if it was exhaust manifolds or intake or both.
Both , BUT I don't think stock exh. manifolds clear the wedge mount ears , at least on the driver side .
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