Installing cam. Advance or not to advance?
#950259
03/13/11 09:27 PM
03/13/11 09:27 PM
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Joined: Mar 2003
Posts: 4,923
Tri-Cities, Washington
VITC_GTX
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master
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OP
master
Joined: Mar 2003
Posts: 4,923
Tri-Cities, Washington
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Putting a '70 383 together with the parts I have (read: not buying any additional parts). Measured compression of 8.3:1 with stock pistons and 906's. Going with a 3.23 or 3.91 and an auto. I plan on using the Summit cam (224/234 @ .050 with .465/.488 lift and 114 centerline). I've have been told by some here to advance it 4-6 degrees and others have warned me not to advance at all because of the split pattern. Anyway, this is over my head...HELP 
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Re: Installing cam. Advance or not to advance?
[Re: 602heavy]
#950262
03/13/11 09:55 PM
03/13/11 09:55 PM
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Joined: Nov 2009
Posts: 2,275
Desert Tracker
HYPER8oSoNic
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,275
Desert Tracker
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8:3 to 1 comp ratio? Something around the 383/440 Magnum cam would be good. Strong midrange power would be best, your choice with the 3.23 or 3.91 gears. With the 3.91's, you could spend a little more money to raise the compression (heads, pistons) in the motor for more torque/power with the present cam you have. Degreeing ALWAYS helps.  
Last edited by HYPER8oSoNic; 03/13/11 09:57 PM.
"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
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Re: Installing cam. Advance or not to advance?
[Re: Pacnorthcuda]
#950266
03/13/11 10:46 PM
03/13/11 10:46 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Quote:
No LSA is different.
Thanks Pac. By coincidence I have that cam in the Summitt link for my upcoming 451
Last edited by RapidRobert; 03/13/11 10:50 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Installing cam. Advance or not to advance?
[Re: 602heavy]
#950269
03/14/11 12:34 AM
03/14/11 12:34 AM
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Joined: Mar 2003
Posts: 4,923
Tri-Cities, Washington
VITC_GTX
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OP
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Joined: Mar 2003
Posts: 4,923
Tri-Cities, Washington
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Quote:
The card states an intake centreline of 109 , this puts the intake/exhaust lobes 5 degrees advanced.
It appears that you subtracted the intake center line (109) from the lobe separation (114) to get the 5 degrees advance. Is that correct? Sorry, but I am very ignorant when it comes to cams.
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Re: Installing cam. Advance or not to advance?
[Re: 68Barracuda]
#950272
03/14/11 09:55 PM
03/14/11 09:55 PM
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Joined: Mar 2003
Posts: 4,923
Tri-Cities, Washington
VITC_GTX
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OP
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Joined: Mar 2003
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Quote:
I put this exact cam in my 70 road runner. Original hp engine never rebuilt, It was put back together just as you are doing yours. We did degree the cam but my mechanic friend did the work and I'm no expert so I don't have much detail for you. I read several post on here that talked about this cam so you may want to do a search. I can tell you I'm happy with it, very streetable and it pulls hard. I do have a bit more stall which is recommended for this cam. Good luck with it, I don't think you will be disappointed.
Rob
Thanks for the info Rob. I believe you may have more compression than I do. I think HP engines were about .5 to .8 higher CR but this is still good news. I think I have a 340 converter that I can through in the car that will help me a little.
Thanks again for the personal experience. 
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