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Re: 440 pistons 120 in the hole
[Re: Dodge]
#722325
06/18/10 10:01 PM
06/18/10 10:01 PM
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Joined: Jun 2005
Posts: 55
st pete fl
roadrunner493
member
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member
Joined: Jun 2005
Posts: 55
st pete fl
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Had the same problem a while back .. swapped the 906s out for a set of 915s and milled them 30 .. It runs strong now with a 280 480 cam using 93 pump gas ..
If it's not a big block i'll just walk..
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Re: 440 pistons 120 in the hole
[Re: SomeCarGuy]
#722326
06/18/10 10:13 PM
06/18/10 10:13 PM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
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Anybody have a 71 440 sitting around with the heads off? Can you tell me how far below the deck the pistons are? Thanks Terry
Well, this is what I don't get. My engine is out of a 71 Newport, a 4bbl, dual exhaust engine. Took the heads off a few years ago and measured the pistons with a straight edge and a feeler gauge. That's all I had. Pistons measured 0.020 on one side and 0.025 on the other side, in the hole. 
That is why you need to have a block;s deck hieght corrected when you do a rebuild. That makes the deck the same all the way around. The little diffence you saw there likely wouldn't change much in the way of performance in a stocker though.
I didn't make my point clear. I see several people posting 0.60 or more in the hole. Was wondering why my '71 engine was closer to 0.020 in the hole. I realize that if I wanted major performance I need to deck the block to make them even, and to also raise compression. But like you said, for a mild build for cruising, it's fine.
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Re: 440 pistons 120 in the hole
[Re: BSB67]
#722328
06/21/10 12:12 AM
06/21/10 12:12 AM
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Joined: Jan 2003
Posts: 75,082
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,082
U.S.S.A.
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Your BLUEPRINT spec is an NHRA number , ACTUAL factory blueprint is closer to the actual .050 in the hole .
Of course. It was implied and I presumed that everyone would understand.
The pistons were part number L2286. I purchased them in 1990.
I wouldn't presume anything , I see way to many people quote NHRA blueprint as actual factory delivered.
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Re: 440 pistons 120 in the hole
[Re: JohnRR]
#722330
06/21/10 12:33 AM
06/21/10 12:33 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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might check the deck surfaces as Mopar factory milling machines leave straight marks whereas most machine shop equipment leaves circular marks. Might help you determine if it has been surfaced sometime in it's life
live every 24 hour block of time like it's your last day on earth
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Re: 440 pistons 120 in the hole
[Re: RapidRobert]
#722331
06/21/10 12:45 AM
06/21/10 12:45 AM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
might check the deck surfaces as Mopar factory milling machines leave straight marks whereas most machine shop equipment leaves circular marks. Might help you determine if it has been surfaced sometime in it's life
Good info to know. 
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Re: 440 pistons 120 in the hole
[Re: gdonovan]
#722333
06/21/10 08:36 AM
06/21/10 08:36 AM
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Joined: Aug 2003
Posts: 777
Washougal,Wa
Dodge
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 777
Washougal,Wa
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Thats what I like to hear. You can get a turd smogger to run. 12.6 is pretty good.
Stand behind your word
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Re: 440 pistons 120 in the hole
[Re: Dodge]
#722334
06/21/10 11:00 AM
06/21/10 11:00 AM
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Joined: Aug 2003
Posts: 777
Washougal,Wa
Dodge
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 777
Washougal,Wa
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Max lift on stock rocker arms?
Stand behind your word
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Re: 440 pistons 120 in the hole
[Re: Dodge]
#722335
06/21/10 04:05 PM
06/21/10 04:05 PM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
Max lift on stock rocker arms?
I'd think anything over .500 is dicey, I had the "six pack" rockers with my 509 cam and it speared the rockers twice after about a year.
Higher spring pressure = more wear on the stamped rockers.
That is the main reason I swapped over to a mechanical cam
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Re: 440 pistons 120 in the hole
[Re: gdonovan]
#722336
06/21/10 09:47 PM
06/21/10 09:47 PM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
Quote:
Max lift on stock rocker arms?
I'd think anything over .500 is dicey, I had the "six pack" rockers with my 509 cam and it speared the rockers twice after about a year.
Higher spring pressure = more wear on the stamped rockers.
That is the main reason I swapped over to a mechanical cam
According to Hughes Engines, stock rockers will work fine with their Whiplash cam that has 0.518" lift.
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Re: 440 pistons 120 in the hole
[Re: Junky]
#722337
06/22/10 04:23 AM
06/22/10 04:23 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
According to Hughes Engines, stock rockers will work fine with their Whiplash cam that has 0.518" lift.
Oh mine worked fine, for several months anyways...
With stamped steel rockers something has to give..
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Re: 440 pistons 120 in the hole
[Re: gdonovan]
#722338
06/22/10 07:23 AM
06/22/10 07:23 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
According to Hughes Engines, stock rockers will work fine with their Whiplash cam that has 0.518" lift.
Oh mine worked fine, for several months anyways...
With stamped steel rockers something has to give..
Well sure Hughs is gonna say that, They want to sell a cam.
IMO, stock rockers are fine for stock cams, if your gonna spin it harder on the race track sometimes, it needs better rockers. "You can pay now, or pay more later".
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Re: 440 pistons 120 in the hole
[Re: Dodge]
#722339
06/22/10 08:05 AM
06/22/10 08:05 AM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Max lift on stock rocker arms?
I ran a .533 320 duration for years with stock rockers and adjustable pushrods (heads were milled .060) ran a best of 11.86 with them @ 3850.
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Re: 440 pistons 120 in the hole
[Re: Challenger 1]
#722340
06/22/10 10:56 AM
06/22/10 10:56 AM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
Quote:
Quote:
According to Hughes Engines, stock rockers will work fine with their Whiplash cam that has 0.518" lift.
Oh mine worked fine, for several months anyways...
With stamped steel rockers something has to give..
Well sure Hughs is gonna say that, They want to sell a cam.
IMO, stock rockers are fine for stock cams, if your gonna spin it harder on the race track sometimes, it needs better rockers. "You can pay now, or pay more later".
I see. So, Hughes Engines is lying to me. I'll have to confront them on that.
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Re: 440 pistons 120 in the hole
[Re: Junky]
#722341
06/22/10 02:22 PM
06/22/10 02:22 PM
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Joined: Jan 2003
Posts: 75,082
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,082
U.S.S.A.
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Quote:
I see. So, Hughes Engines is lying to me. I'll have to confront them on that.
Good luck with that , let us know how it works out for you .
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Re: 440 pistons 120 in the hole
[Re: Junky]
#722342
06/22/10 03:45 PM
06/22/10 03:45 PM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
I see. So, Hughes Engines is lying to me. I'll have to confront them on that.
Oh it will work, the question is for how long.
I had brand new Mopar Performance 6-pack rockers with zero miles using the recommended MP spring with the .509 cam.
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