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Re: 440 6pk Cam Selection Tips [Re: B1MAXX] #3158654
07/10/23 08:34 PM
07/10/23 08:34 PM
Joined: Aug 2003
Posts: 43,897
Bend,OR USA
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Cab_Burge Offline
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Joined: Aug 2003
Posts: 43,897
Bend,OR USA
Originally Posted by B1MAXX
Lobe separation angle is simply the angle between the the lobe centers.
confused In relation to what work?


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 440 6pk Cam Selection Tips [Re: Cab_Burge] #3158697
07/10/23 11:09 PM
07/10/23 11:09 PM
Joined: Jan 2003
Posts: 31,257
Oregon
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AndyF Offline
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Oregon
Originally Posted by Cab_Burge
Originally Posted by B1MAXX
Lobe separation angle is simply the angle between the the lobe centers.
confused In relation to what work?


LSA isn't in relation to anything else. The LSA exists even if the camshaft is sitting in a box or on the bench.

Re: 440 6pk Cam Selection Tips [Re: Cab_Burge] #3158704
07/11/23 12:19 AM
07/11/23 12:19 AM
Joined: May 2019
Posts: 725
Lake Villa Il
INTMD8 Offline
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Lake Villa Il
Originally Posted by Cab_Burge
confused In relation to what work?


Nothing, that's it smile


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
Re: 440 6pk Cam Selection Tips [Re: Cab_Burge] #3158708
07/11/23 01:14 AM
07/11/23 01:14 AM
Joined: Jul 2005
Posts: 721
California
BigDaddy440 Offline
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California
Originally Posted by Cab_Burge
[/quote] tsk Don't spread misinformation about LSA, Lobe separation angles means when the cam lobe is at max lift from TDC, the same lobes ground on 104 LSA will have a lot rougher idle with less manifold vacuum than a cam with the same lobes ground on a 112 LSA due to less over lap at TDC on the wider LSA work scope twocents


Cab,

With all do respect, I'm certainly not intentionally spreading misinformation about camshaft characteristics. However, I did make a mistake, and I think it's causing the confusion. In my simple example, I should have said: "A general rule of thumb is that the Wider the LSA (bigger number) the more tame your idle characteristics will become and more engine vacuum you'll produce. So an LSA of 112 will idle smoother than say a Tighter LSA of 108 degrees." My mistake was that I confused the terms Tighter and Wider.


Other than that, I don't see any conflict in the information I've provided the topic starter and the information you provided. I hope this helps clear things up. Sorry for any confusion.

-Dan

Last edited by BigDaddy440; 07/11/23 01:17 AM.

1969 A12 Roadrunner
1970 Plymouth Cuda
1968 Dodge Dart
Re: 440 6pk Cam Selection Tips [Re: Cab_Burge] #3158742
07/11/23 07:22 AM
07/11/23 07:22 AM
Joined: May 2005
Posts: 2,106
Apollo, PA.
B1MAXX Offline
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Posts: 2,106
Apollo, PA.
Originally Posted by Cab_Burge
Originally Posted by B1MAXX
Lobe separation angle is simply the angle between the the lobe centers.
confused In relation to what work?


From the centerline of one lobe to the other. Thats it.

Re: 440 6pk Cam Selection Tips [Re: B1MAXX] #3158789
07/11/23 09:39 AM
07/11/23 09:39 AM
Joined: Jan 2003
Posts: 9,944
Weddington, N.C.
Streetwize Offline
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Weddington, N.C.
Something around 239/243 @.050 and .620/.620 gross lift (1.6:1 rockers) would work really nice and let you get the heads to breathe.

I would run a 109 lobe center in maybe at +2 (107 ICL)

Something like the old Ultradyne NF70/NF62 .904 (Chrysler lobe)

This would give you a nice 162/164 degrees @.200 but mild seat to seat so the idle will be sweet.

I think Bullet still grinds the old Harold U/D cams

A solid flat tappet adjusted for lash is about 8-10 degrees smaller at .050 than a hydraulic so this is really a pretty mild cam. that's only 23 degrees of @.050 overlap if my math is still good, lol. With a dual plane six pack and headers that's about perfect.


EDIT:

This Hughes grind is dead on what I would consider picking:




Category : D- Big Block (Low Deck) : Camshaft : Flat Tappet, Solid


HUG STL3842BS3-9


BB SLD FLAT TAPPET CAM 238/242 -109ÂșLSA

3 BOLT .372"/.376" LOBE LIFT

$241.35


Flat tappet solid big block "B/RB" camshaft.

Hughes "real" Chrysler cam

All of our big block solid cams are three bolt.

Basic guidelines (These are not absolutes, just guidelines to help you get close on a cam choice)
Use: Street Performance, high rise dual plane intake & headers. Mildly ported cylinder heads
Idle: Noticable
Converter: 3000 stall +
Rear gear: 3.55+





Last edited by Streetwize; 07/11/23 01:35 PM.

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