Lunati 402A3LUN Cam in a stock 396 - Chevelle Tech
Chevelle Tech join team chevelle as a supporting member  
Chevelle Parts at SS396.com      
GROUND UP & SS396.com         
Official Sponsor of Team Chevelle
     

Auto Insurance

Chevelles.com is the premier Chevrolet Chevelle Forum on the internet. Registered Users do not see the above ads.
Performance Our High Performance area

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old Jul 31st, 09, 6:13 PM
Latigo Latigo is offline
Tech Team
Steve
 
Join Date: Oct 1998
Location: St. Louis, Missouri
Posts: 59
Default Lunati 402A3LUN Cam in a stock 396

Guys,
I have a 66 Chevelle SS 396 which I have added a new Eddelbrock Air Gap intake, and a new Holly 750 DP. OTher than that, it is stock. The heads are the 109cc closed chamber oval port heads. I would like to install a Lunati 402A3 cam. I understand I need to replace the Powerglide converter to a 2500 stall converter. I only plan to drive once in a while on the street, and will not race it(?). My question is, will my stock rockers and springs hold up for a while, until I can spring for roller rockers and springs. I want that beefy rough idle sound. Does any of this make sense?

Thanks guys
Steve
__________________
Life is tough... but it's tougher if your stupid.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old Jul 31st, 09, 6:15 PM
65lkey 65lkey is offline
Senior Tech Team
Paul
 
Join Date: Dec 2007
Location: Olympia washington
Posts: 2,306
Default Re: Lunati 402A3LUN Cam in a stock 396

your gonna need different springs if your going from a HFT to a SFT. IMHO just save up and do it all at once
__________________
Trying to break the 13's $1 at a time
1965 El camino
http://s88.photobucket.com/albums/k1...20El%20camino/
Reply With Quote Quick reply to this message
  #3  
Old Jul 31st, 09, 6:26 PM
Latigo Latigo is offline
Tech Team
Steve
 
Join Date: Oct 1998
Location: St. Louis, Missouri
Posts: 59
Default Re: Lunati 402A3LUN Cam in a stock 396

HFT to SFT? Sorry, no Capisce.

Steve
__________________
Life is tough... but it's tougher if your stupid.
Reply With Quote Quick reply to this message
  #4  
Old Jul 31st, 09, 6:29 PM
71454Chevelle 71454Chevelle is offline
Lifetime Premium Member
Darren
 
Join Date: Oct 2000
Location: Indianapolis IN
Posts: 2,733
Send a message via ICQ to 71454Chevelle
Default Re: Lunati 402A3LUN Cam in a stock 396

Quote:
Originally Posted by Latigo View Post
HFT to SFT? Sorry, no Capisce.

Steve
HFT= Hydraulic Flat Tappet
SFT= Solid Flat Tappet
__________________
Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems HP1000
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Mosier axles
30x12.5 ET Street Radial
525++ rwhp
http://www.chevelles.com/showroom/da...0930-00149.jpg
http://www.chevelles.com/showroom/da...m/Vic_Jr_1.JPG
Reply With Quote Quick reply to this message
  #5  
Old Jul 31st, 09, 6:49 PM
65lkey 65lkey is offline
Senior Tech Team
Paul
 
Join Date: Dec 2007
Location: Olympia washington
Posts: 2,306
Default Re: Lunati 402A3LUN Cam in a stock 396

Quote:
Originally Posted by Latigo View Post
HFT to SFT? Sorry, no Capisce.

Steve
Sorry, Solid Flat tappet cams require different spring pressures than a hydraulic flat tappet
__________________
Trying to break the 13's $1 at a time
1965 El camino
http://s88.photobucket.com/albums/k1...20El%20camino/
Reply With Quote Quick reply to this message
  #6  
Old Jul 31st, 09, 8:27 PM
Twins Fan Twins Fan is offline
Lifetime Premium Member
Brad
 
Join Date: Aug 2006
Location: Auburn, WA
Posts: 2,578
Default Re: Lunati 402A3LUN Cam in a stock 396

Are you saying that your 66 Chevelle SS 396 has a powerglide in it?

In a 396, that cam is going to want a good amount of compression. Do you know for sure where yours is at? Then it's going to want probably closer to a 3500 converter, especially if you have a powerglide. Then it's going to want some fairly steep rear gears. Do you know what you have? If you don't have these things it will be a slug at low rpm's, which is where most of your street driving will be done.

Like the others have said, you will definately need new valve springs.

Tell us more about your combo. I think there's better cams out there for you that will still give it a rumble.
Reply With Quote Quick reply to this message
  #7  
Old Jul 31st, 09, 9:12 PM
Latigo Latigo is offline
Tech Team
Steve
 
Join Date: Oct 1998
Location: St. Louis, Missouri
Posts: 59
Default Re: Lunati 402A3LUN Cam in a stock 396

Yup, power glide. 2 sp. It works fine.

Steve
__________________
Life is tough... but it's tougher if your stupid.
Reply With Quote Quick reply to this message
  #8  
Old Jul 31st, 09, 9:15 PM
Latigo Latigo is offline
Tech Team
Steve
 
Join Date: Oct 1998
Location: St. Louis, Missouri
Posts: 59
Default Re: Lunati 402A3LUN Cam in a stock 396

Twins fan,
Thanks great info. Was not aware of the tranny thing.

I'll get info together on it.

Steve
__________________
Life is tough... but it's tougher if your stupid.
Reply With Quote Quick reply to this message
  #9  
Old Jul 31st, 09, 9:20 PM
Latigo Latigo is offline
Tech Team
Steve
 
Join Date: Oct 1998
Location: St. Louis, Missouri
Posts: 59
Default Re: Lunati 402A3LUN Cam in a stock 396

Oh, no clue on the compression ratio.

Heads are stock 3931063 oval port heads at 1098cc. Thought this would be in the range of 9.5:1

Stock crank, stock rockers, only diff is the Eddelbrock Air Gap and Holly 750 DP.

So I guess it's essentialy stock.

Regards
Steve
__________________
Life is tough... but it's tougher if your stupid.
Reply With Quote Quick reply to this message
  #10  
Old Jul 31st, 09, 10:41 PM
how69ss how69ss is offline
Lifetime Premium Member
Scott
 
Join Date: Oct 2007
Location: Midwest
Posts: 1,127
Send a message via ICQ to how69ss
Default Re: Lunati 402A3LUN Cam in a stock 396

You can look up the heads here: http://www.mortec.com/bbc.htm

Here are the specs on them from the above website:

3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber

Here is what they flow stock, just scroll down: http://www.j-performance.com/index.p...ask=view&id=28
Reply With Quote Quick reply to this message
  #11  
Old Jul 31st, 09, 10:44 PM
how69ss how69ss is offline
Lifetime Premium Member
Scott
 
Join Date: Oct 2007
Location: Midwest
Posts: 1,127
Send a message via ICQ to how69ss
Default Re: Lunati 402A3LUN Cam in a stock 396

I woldn't skimp on springs. I used some old springs on a cam change and I floated all the valves and shredded a bunch of shims and sent metal all through my motor (except for the cylinders). What a mess.

Last edited by how69ss; Aug 1st, 09 at 9:31 AM.
Reply With Quote Quick reply to this message
  #12  
Old Aug 1st, 09, 12:15 AM
Twins Fan Twins Fan is offline
Lifetime Premium Member
Brad
 
Join Date: Aug 2006
Location: Auburn, WA
Posts: 2,578
Default Re: Lunati 402A3LUN Cam in a stock 396

Quote:
Originally Posted by Latigo View Post
Yup, power glide. 2 sp. It works fine.

Steve
I didn't think they came with Powerglides, but i just looked it up and that sounds about right. I learned something there.

Your compression is probably good enough for that cam, although I'd say it could use more. That 1.something first gear of the Powerglide and a stockish stall converter would make you hate the combo as far as take offs go. I don't think that cam will come on until 3000+ in a 396. That's why I mentioned the 3500 stall earlier. It's still gonna want some rear gear also.

Are you set on a solid cam? There are some hydraulic FT cams that can give you the rumble and probably work with the valve springs you have now.
Reply With Quote Quick reply to this message
  #13  
Old Aug 1st, 09, 12:27 AM
pdq67 pdq67 is offline
Guest
Paul
 
Join Date: Jan 2001
Location: Columbia, MO, USA
Posts: 14,685
Default Re: Lunati 402A3LUN Cam in a stock 396

Stock springs are only good for the .398"/.398" or .461/.480" lift cams back then depending on cam so install the recommended springs for that cam or you will be shortly SOL!!

He, He!! "***** outta luck"!!

And right around 96.7 to 101 cc heads, again, depending on casting number. And run the stock .020" thick steel shim headgaskets too!

pdq67
Reply With Quote Quick reply to this message
  #14  
Old Aug 1st, 09, 1:50 AM
sschevellefan sschevellefan is offline
Lifetime Premium Member
Anthony
 
Join Date: Sep 2004
Location: Citrus Heights, CA
Posts: 8,685
Default Re: Lunati 402A3LUN Cam in a stock 396

you should try the UD 280/288 cam that several peple here are using and have used in the past. I don`t remember all the specs but it seems like a nice cam and should work qith the rest of your stuff but will probably require a spring change for sure.
Reply With Quote Quick reply to this message
  #15  
Old Aug 1st, 09, 3:08 AM
Stikman33 Stikman33 is offline
Senior Tech Team
Daniel
 
Join Date: Nov 2001
Location: Turlock, Ca. USA
Posts: 2,502
Default Re: Lunati 402A3LUN Cam in a stock 396

Yeah, you will have to change the springs also if you are wanting go with that cam... No way stock springs will work with those lift numbers without destroying themselves!

-Daniel
__________________
1970 Chevelle - Best time at the WCCG 12.749 @ 108.606, 2.011 60' on street tires!

427 BBC, 215 heads, 2.19/1.88 valves with some port work, 60212 Lunati Hyd Roller, 3310 Holley 750, Performer RPM intake, TH350 with shift kit, 3.55 gears 12 bolt posi, Pypes 3 inch kit, it's alive... again!!!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply
Chevelle Tech > General Tech Area > Performance      Current Topic: Lunati 402A3LUN Cam in a stock 396
Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:17 AM.


Is there a site like this for?    El Caminos Camaros Novas Impalas GTO Chevy Punch All Chevys

2009 Team Chevelle - AutoForums