Question on plugs for dart 320 heads
#1
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Join Date: Oct 2004
Posts: 5
Question on plugs for dart 320 heads
I have a set of dart 320 heads and plan to put them on a 509 dart block. The dome on the Ross pistons I have could hit the plugs. I was told to run an Autolite 23 plug. This plug has a short projected tip. What plug would work better and offer more clearance? Someone sugjested Bosch +4 but I don't have a number for the plug.
Thanks Steve
Thanks Steve
#2
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Join Date: May 2003
Location: Owingsville, Ky
Posts: 157
On my 539, I run the Dart 320 heads along with Ross pistons. I had to cut "fire slots" in my pistons, run the Autolite race plugs, and index to keep from closing up the gaps. I have two different sets of the Dart heads and one set uses the gasket seat plug AR3933, and I have also used the NGK plug R5671A-8 (stock #4554). But the other set of heads use the tapered seat plugs and I can't remember the numbers, right now.
Bill M
Bill M
#3
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MASTER JOURNEYMAN
Join Date: Dec 2004
Location: Memphis
Posts: 38
Index your plugs,I had the same heads........Had no choice but to do
indexing......I would index multiple sets of plugs on the engine stand so I wouldent break my back while the engine was in the car.
If you do it this way you wont even need washers...
Also,Bosch plugs would not be what I would use on a BBC race engine
indexing......I would index multiple sets of plugs on the engine stand so I wouldent break my back while the engine was in the car.
If you do it this way you wont even need washers...
Also,Bosch plugs would not be what I would use on a BBC race engine
#4
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RACING JUNKIE
Join Date: Mar 2004
Location: Maine,USA
Posts: 1,204
Steve use AR3933 Autolites you should be fine if its a standard deck and the heads haven't been shaved,you won't need to index them either
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#5
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MASTER JOURNEYMAN
Join Date: Oct 2004
Posts: 36
Originally Posted by sp2816
On my 539, I run the Dart 320 heads along with Ross pistons. I had to cut "fire slots" in my pistons, run the Autolite race plugs, and index to keep from closing up the gaps. I have two different sets of the Dart heads and one set uses the gasket seat plug AR3933, and I have also used the NGK plug R5671A-8 (stock #4554). But the other set of heads use the tapered seat plugs and I can't remember the numbers, right now.
Bill M
Bill M