PONTIAC ZONE TECH FORUMS
 

Go Back   PONTIAC ZONE TECH FORUMS >
Engine Tech
> Iron D-Port Heads
User Name
Password

Iron D-Port Heads All iron d-port heads, flow number and performance results

sponser links

Reply
 
Thread Tools
Old 04-12-11, 05:18PM   #1
jeffb
Registered User
 
jeffb's Avatar
 
Join Date: Jun 2010
Location: Exeter PA
Posts: 149
Default best plugd for d ports

What would the best plugs to use in d ports, specifically 1971 #96 castings? I am a fan of the good old Autolite #85's, not the platinum, but plain old 85's. Anything better that will increase performance or???
jeffb is offline   Reply With Quote
Old 04-12-11, 07:53PM   #2
LMS-RACER
Pontiac Racer 1966
 
LMS-RACER's Avatar
 
Join Date: Jul 2005
Location: Clover, SC
Posts: 110
Default Plugs ..

Quote:
Originally Posted by jeffb View Post
What would the best plugs to use in d ports, specifically 1971 #96 castings? I am a fan of the good old Autolite #85's, not the platinum, but plain old 85's. Anything better that will increase performance or???
jeffb,
I use Non-Resistor Plugs.
I've used the Accel #134 & #137 plugs, dependant upon the application, they've always worked well.
(I also index the plugs and set the gaps between 0.035" & 0.040" depending on the application.)

I've also used the Autolite #AR73 Plugs off & on over the years. No performance improvement or loss with these plugs.
(I was using the #AR74 Plugs until they deleted them.)

Larry S.

Made in the USA !!
www.precisionautomotivespecialists.com
LMS-RACER is offline   Reply With Quote
Old 04-13-11, 12:59AM   #3
494GOAT
OLDGOAT
 
494GOAT's Avatar
 
Join Date: Jun 2005
Location: Loveland, CO
Posts: 211
Default

I've always used the Autolite 85's or 86's.
__________________
Factory Block/Crank/D-ports
3550lbs 1965 GTO
Footbraking/Full Exhaust
1.41 / 6.45@104.97mph /10.25@127.12mph

http://www.pontiaczone.com/forum/vbp...?do=view&g=379
http://www.youtube.com/watch?v=nZqdcH0Ltc4
494GOAT is offline   Reply With Quote
Old 07-13-11, 06:14PM   #4
thomas flaherty
Registered User
 
Join Date: Aug 2010
Location: norwood ma 02062
Posts: 372
Default d port plugs

what are you guy running in the autolite plug just the plain old non-resistors or step up to platinums also in the plain 85/86 but larry s you are running platinum AR73 Do you see any more performance from them

Last edited by thomas flaherty : 07-13-11 at 06:20PM. Reason: was not completed
thomas flaherty is offline   Reply With Quote
Old 07-14-11, 11:42AM   #5
Mr. PBody
Registered User
 
Join Date: Feb 2009
Location: Chesterfield, VA
Posts: 819
Default

A couple things. Nobody "knows" GM like GM. AC R44s are the ticket, IMO. The Autolites are good, also, but we have much longer "lived" plugs using AC.

Platinum plugs should be used ONLY in a catalyst car with all that still operating. Until combustion temperatures reach a certain point, the "self-cleaning" characteristics don't "work". Non-catalyst cars NEVER reach that temp unless something is drastically wrong. Platinum plugs are for modern cars.

Jim
Mr. PBody is offline   Reply With Quote
Old 07-14-11, 05:42PM   #6
LMS-RACER
Pontiac Racer 1966
 
LMS-RACER's Avatar
 
Join Date: Jul 2005
Location: Clover, SC
Posts: 110
Default Clarification !!

Quote:
Originally Posted by thomas flaherty View Post
what are you guy running in the autolite plug just the plain old non-resistors or step up to platinums also in the plain 85/86 but larry s you are running platinum AR73 Do you see any more performance from them
Hey Tom,
Autolite AR73 Plugs = Autolite Racing / #7 Means Non-Resistor / #3 is the Heat Range. They're not Platinum. They have "Cut-Back" Ground Electrodes. They're also Two Heat Ranges Colder than the AC R44S, which is a Resistor Plug.

As far as life expectancy goes, I can't tell the difference between the Accel/Nipondenso Plugs and the Autolites.

BTW, the Accel Plugs that I previously listed are also non-resistor.

Spark Plugs are Application Specific, as in the Evironment within the Combustion Chamber that they must deal with. Dynamic Compression Ratio, Engine Tune, Oil Consumption, Length of Time at WOT, etc. .......

No One Plug Fits All... The Plugs that I've Listed are for Drag Racing / High Compression / Extreme Load Applications.

Hope this Helps,
Larry S.

http://www.precisionautomotivespecialists.com
LMS-RACER is offline   Reply With Quote
Old 07-15-11, 09:16AM   #7
thomas flaherty
Registered User
 
Join Date: Aug 2010
Location: norwood ma 02062
Posts: 372
Default

Mr pbody and larry thank you i did some checking after posting and found the same things. On a side note what do you guys think of having your plugs cryogenic frozen this is done a lot in stock/super stock classes. also larry best of luck in the new part of your business just wished i was closer to have you work on my car but i can still buy parts
thomas flaherty is offline   Reply With Quote
Old 07-15-11, 12:03PM   #8
Ken Keefer
Registered User
 
Join Date: Apr 2011
Location: Brooksville, Fl.
Posts: 164
Wink

ProLine Racing Engines have found HP with NGK's on their dyno.
__________________
Ken's Speed & Machine Shop
512 S. Main St.
Brooksville, Fl. 34601
1-352-796-8800
pdsales@tampabay.rr.com
http://Pontiacdude.cc
Your ATI ProCharger dealer for Pure Pontiac Blow thru applications.
Ken Keefer is offline   Reply With Quote
Old 07-15-11, 03:29PM   #9
Mr. PBody
Registered User
 
Join Date: Feb 2009
Location: Chesterfield, VA
Posts: 819
Default

What's being missed here is this engine is not "high compression". With the 96s, its around 9:1. If it's a race engine, I understand concern over "making power". But for a streeter, there's something be said for "stock"... Price and durability are every bit as important, IMO.

Jim
Mr. PBody is offline   Reply With Quote
Old 07-15-11, 04:36PM   #10
LMS-RACER
Pontiac Racer 1966
 
LMS-RACER's Avatar
 
Join Date: Jul 2005
Location: Clover, SC
Posts: 110
Default Appreciation..

Quote:
Originally Posted by thomas flaherty View Post
Mr pbody and larry thank you i did some checking after posting and found the same things. On a side note what do you guys think of having your plugs cryogenic frozen this is done a lot in stock/super stock classes. also larry best of luck in the new part of your business just wished i was closer to have you work on my car but i can still buy parts
Hey Tom,
I truely thank you for the friendly/supportive comments. If I can help you, let me know...
Larry S.

Quote:
Mr. PBody
What's being missed here is this engine is not "high compression". With the 96s, its around 9:1. If it's a race engine, I understand concern over "making power". But for a streeter, there's something be said for "stock"... Price and durability are every bit as important, IMO.

Jim
Hey Jim,
I agree with what you're saying. I wouldn't run a Non-Resistor Type Plug in a "Street Car" and I also believe that the AC Plugs would be a Fine Choice as long as the Heat Range was taken into consideration...

Larry S.
LMS-RACER is offline   Reply With Quote
Old 07-16-11, 12:44PM   #11
Mb125
Registered User
 
Mb125's Avatar
 
Join Date: Mar 2005
Location: AZ
Posts: 4,040
Default

I ran AC, Champions, NGK, Autolite on a 12.75:1 400 with all the same results. Hard to say which plug is better.
__________________
You can shear a sheep many times, but you can only skin them once.
Mb125 is offline   Reply With Quote
Old 07-16-11, 08:36PM   #12
Dragncar
Registered User
 
Join Date: Aug 2005
Location: Mcinleyville CA
Posts: 632
Default

I run Champion R18YCs in my 9.3 CR 455 and for some reason they run a tenth faster than ACs, Autolights and NGKs.
I had the same set in my car for 3 years and they literally fell apart last race. One broke in half at the insulator for some reason and another was loose around the insulator.
So I put some new NGKs in and the engine sounded a lot better but ran a tenth slower.
I am cleaning up some old Champs for tomorrows race and I bet they will run faster than the NGKs.
I do not know why, the other plugs are better made and the "nut" part of the plugs are so short I have to use a socket that I ground a bevel all they way around it to fit deeper so it would grab it.
But for whatever reason they are a lesser plug but run better in my car.
I would like to see if they make a race version of that plug with no resistor.
Dragncar is online now   Reply With Quote
Old 07-18-11, 01:54PM   #13
U12RACE
468 '69 Firebird
 
U12RACE's Avatar
 
Join Date: Mar 2006
Location: AMANDA, OHIO
Posts: 281
Smile

I use only AC R-44S in my #13 heads. I usually put about 150-200 1/4 mile runs on them per year. However, I do change them once a year - need them or not. - Kyle
__________________
400 bored and stroked to 468, #13 heads, 3.70 gears.
Current best: 10.382 @ 128.33 mph, 1.413 60'. 3440# race weight. Powered by E-85.
U12RACE is offline   Reply With Quote
Old 01-28-12, 12:32AM   #14
boomers T/A
Registered User
 
Join Date: Nov 2010
Location: farmington ar 72730
Posts: 70
Default

I'm a GM guy thru and thru,but I have a engineer friend that worked for Autolite. He showed and explained their product. Funny thing is I've always used Autolites now I'm really sold on them. Work great in my GMC also.
boomers T/A is offline   Reply With Quote
Old 05-09-15, 09:46PM   #15
Half-Inch Stud
Half-Inch Stud
 
Half-Inch Stud's Avatar
 
Join Date: Oct 2002
Location: Norristown PA
Posts: 66
Default

Brand: NGK or AutoLite

Plug NGK 6 or 8 V-Power (but cannot buy them anymore)

NGK 85
__________________
carb'd 460 crankHP and
blown 650 crankHP from the same D-port 48 Headed longblock
Half-Inch Stud is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wide Ports For Sale Gach Parts & Cars For Sale & Wanted 8 05-12-10 05:25PM
Anybody know when the Edelbrock D Ports will be available? Josh69 Aftermarket News & Products 8 03-22-10 11:54PM
2 ports?? ponchospidel Forced Induction 0 03-07-10 03:07AM


All times are GMT -3. The time now is 04:39AM.

Featured Ads
Ken's Speed & Machine
Mayhem Turbocharging

Carter Cryogenics.  What can we freeze for you?

Pacific Performance Racing

Central Virginia Machine Service.  Home of the Injun Engine!

All Pontiac Engine Kits

Larry's Auto Machine.  Full serivce auto, marine machine shop, domestic and foreign.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
2001 - 2007 PontiacZone.com
Page generated in 0.12435 seconds with 45 queries