1970 Lt1 carb. settings

[mockingbird812]

As mentioned before, I am rebuilding/restoring the original owner's (Roofs) dual point, mechanical-advance-only Mallory YC-465HP distributor for my Deuce. Any recommendations on setting this up? Dwell? All advance in by.....? Earl Roof told me that Mallory dual point really woke his car up.

Good thread. Thanks!

[YENKO DEUCE REGISTRY]

Ok, the complete setup was not in my glovebox - but in a box in the basement [img]<<GRAEMLIN_URL>>/rolleyes.gif[/img] Can't do me much good there, but....

My Carb setup:

Accelerator pump cam = white one, installed via hole #1
Accelerator gap at w.o.t. = .015
Accelerator gap at rest = 0
Accelerator spring = old style, no nylok nut

Secondary Vacuum Spring color = Yellow

Primary Power Valve = 6.5
Primary Jets = 72

Secondary Power Valve = Blocked
Secondary Jets = 82

Squirter = 31


Timing = ~36 degrees total, all in by 2000 rpm. Personally, I like the dial type timing lights.

Spark plugs = use the NGK's!!!!


Suspension setup:

Front tire pressure = 44psi
Rear tire pressure = 40psi

Front &amp; Rear shocks = good, basic gas shocks - can use 50/50's

Rear springs = 2 spring clamps on each side, both clamps in front of the rear wheels but on different leaf stacks

This setup should get you started, let us know how you make out.

[al8apex]

OEM stock were 72 primary and 76 secondary, they were way to rich for the 1100 feet elevation here in Phoenix ...

the above may work ok for a drag car but will be &quot;phat&quot; for the street

again, IMHO, YMMV, etc

[70 Forest Green Zee]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: al8apex</div><div class="ubbcode-body">OEM stock were 72 primary and 76 secondary, they were way to rich for the 1100 feet elevation here in Phoenix ...

the above may work ok for a drag car but will be &quot;phat&quot; for the street

again, IMHO, YMMV, etc </div></div>

Jim...according to Eric the stock jet size is 70 primary and 76 secondary...power valve is 6.5. I have the 4489 carb for NA9 Calf emissions and I don't know if they used different jet sizes than a non NA9 carb. A friend of mine has a 69Z and his non NA9 carb is also jetted 70 and 76 with 6.5 power valves.

[al8apex]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 70 Forest Green Zee</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: al8apex</div><div class="ubbcode-body">OEM stock were 72 primary and 76 secondary, they were way to rich for the 1100 feet elevation here in Phoenix ...

the above may work ok for a drag car but will be &quot;phat&quot; for the street

again, IMHO, YMMV, etc </div></div>

Jim...according to Eric the stock jet size is 70 primary and 76 secondary...power valve is 6.5. I have the 4489 carb for NA9 Calf emissions and I don't know if they used different jet sizes than a non NA9 carb. A friend of mine has a 69Z and his non NA9 carb is also jetted 70 and 76 with 6.5 power valves. </div></div>

my bad, I had stated it correctly earlier in this thread, 70 &amp; 76 were OEM, according to the link I posted earlier in this thread, sorry.

[70 Forest Green Zee]

No problem Jim...you're right on 99.9% of the time! [img]<<GRAEMLIN_URL>>/beers.gif[/img]

[YENKO DEUCE REGISTRY]

Actually, the 70 or 72 primary jets are too fat for the street here in PA too. In street trim I put 68's in the primary side to help stave off the plug fouling, but I leave the 82's and the blocked p/v in the secondary side. I've got the timing curve and secondary spring synced up to the point that just when the full timing advance is coming in - so is the slam from the blocked p/v and the fat jets. This makes 2nd and 3rd gears a blast to drive! [img]<<GRAEMLIN_URL>>/grin.gif[/img]

[John Brown]

Very helpfull information.

Thanks to Marlin and Peter for this heads-up. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

[70 Forest Green Zee]

For what it's worth Eric Jackson restored and rebuilt my carb for my 70Z about a year ago using all the stock type parts...jets, power valves,ect. and my car never ran so good! You would be surprised at what a difference it makes to have someone who really knows what he's doing rebuild your carb and use the correct parts, makes. I rebuilt the carb about a year or so before I sent it to Eric and my car runs absolutely perfect now. I do however agree with Marlin and I also use the NGK XR5 plugs...they seem to be a little hotter plug than the R43 and they don't foul.

[todd micheal]

Marlin, forgive me but how do i set accelerator pump a w.o.t. ( hold open and should have .015 gap) What does old stlye spring look like for accelerator pump? with no lock nut. And what is the best way to block off p.v. in secondary? What number ngk's And i do have a dial in timing light. thank you for all the help. TODD