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Old 02-11-2007, 01:00 AM
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Spark plugs

Engine I bought with new toy is needing new plugs. It has the following specs on the engine:
010 block bored .060 with splayed caps and cemented
3.5" stroke Eagle crank and 6" h-beams
JE 13cc domed pistons
Dart Pro 1 215cc heads (reworked runners) w/ 64cc chambers
Comp 300BR-6 roller (264/270 at .050, .630/.630 lift) with 1.6 rockers
Edelbrock Super Victor intake (port matched) with HVH spacer
Stinnet 850 Holley
MSD 6AL ignition with MSD Pro-billet distributor & MSD wires

The plugs that were in the engine last year and used by previous owner were Champion N61DR. I want to go to NGK and thought about using the BR7ES plugs. Wondering what everybody thought or anyone else ran in in a similar combination?
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Old 02-14-2007, 11:04 PM
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I use auto lite AR 25 projector tips, they will need to be special ordered, not a wallmart plug, use em in what I call my angry stroker, 10.5 comp. radical cam. the plugs are 5/8s. Personally never liked champions very much and a good thing about NGK is the you can get them in 1/2 heart ranges. Nice for tuning I think they are the only mfg that does that..............

Last edited by pepi; 02-14-2007 at 11:10 PM.
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Old 02-15-2007, 07:34 AM
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The plugs that GM Performance Parts uses on their engines is an AC Delco MR43LTS. It is a marine plug and has served me very well. I would not use a Champion plug in my lawn mower .

Vince
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Old 02-15-2007, 10:33 AM
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Dart would recommend any 14mm taper seat .460 reach plug like AR133


That's a pretty big cam for the compression.
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Old 02-15-2007, 10:47 AM
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Double check that the plug seat and reach is correct for your heads.
I have seen the incorrect plugs installed.

Pick your brand loyalty and do a crossover.
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Old 02-15-2007, 07:07 PM
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I called NGK as I could not find a crossover for that plug which they had problems also. Also that Dart head takes a 14mm .750 reach plug not a .460 reach. I also figure about close to 13:1 compression which I don't understand how this cam is too big for this kind of compression. They recommended the R5671A-8 plug or the BR8ES which looks like a good starting point
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Old 02-15-2007, 09:01 PM
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Hi tornado-tech,
I recently ported a set of 215 Dart Pro1s for a very similar combination running
in a bracket car. It's a real strong runner, your combination sounds great.

I'm not familiar the the heat ranges of the brands of plugs you mention, I use
autoliite exclusively. Here's what I recommend, you can use this for a cross
reference if you rather NGK or another brand.

Yes, the dart pro1 heads take a 14mm thread, 3/4" reach plug. For a non resistor
power tip plug use AR3911 or for a standard reach plug use a AR3934. Both of
these are a rather cold plug, should work great for your high compression.


I did a cross reference:

AR3911 - NGK R5672A8 Non-Resistor Projected Tip

AR3934 - NGK R5671A8 Non-Resistor Standard tip

Last edited by automotive breath; 02-15-2007 at 09:36 PM.
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Old 02-16-2007, 11:03 AM
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I ughhhh....

Gotta go to the shop and check something.....
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Old 02-18-2007, 08:22 PM
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Thanks to all who replied. Never even thought about Autolite's and for what I just bought 16 AR3911's for on E-bay, it's even better!
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Old 02-18-2007, 08:26 PM
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Quote:
Originally Posted by 302/Z28
would not use a Champion plug in my lawn mower .
Vince
My Falcon 200 ate 3 sets.... in a weeks time. the Autolites were running strong when I pulled the engine for the turbo rebuild. they were Autolite 46's, I'll probably go 1 step colder, with the turbo
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