1970 Lt1 carb. settings

[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]

[todd micheal]

Marlin, What do you think about a 50cc accerlator pump??Should i give a shot, and down size squirter little??? any one else many chime in. Thanks for all the help out there, Todd

[al8apex]

a 50cc pump will just drown the engine, he has too much fuel it sounds like and not enough timing

[YENKO DEUCE REGISTRY]

No.