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Username Post: reading the plug        (Topic#375803)
995jim 
"7th Year" Silver Supporting Member
Posts: 949
995jim
Loc: Ohio
Reg: 12-17-06
10-06-24 03:42 PM - Post#2874460    

hello, just looking for comments on this plug. engine is a 468, 6:71 blower, 8:1 comp, #8 boost (2)- 750 holley carbs 5.5power valve, 67main jets. To me the plug looks good but I would like some input as to whether or not its a little rich or to lean for a blower . Im new to a blower motor.
thanks jim

Attachment: plug.jpg (173.74 KB) 102 View(s)




Jim

65' Impala SS, 65' Belair, 89' Silverado Z71, 95' Silverado Z71, 12' Silverado, 15' Silverado LTZ, 16' Tahoe LTZ


 


bobb 
Super Senior Member
Posts: 6828

Loc: paradise
Reg: 09-05-03
10-09-24 07:29 AM - Post#2874529    
    In response to 995jim

looks ok to me. you probly need lots of initial timing and not so much total centrifugal timing. i use an af monitor to tune wot, cruise and power valve values. idle and off idle i just go by how it drives. if it goes too lean at wot you could get into lots of trouble. i use big plug gaps too. that air pump makes it a whole different animal.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
995jim 
"7th Year" Silver Supporting Member
Posts: 949
995jim
Loc: Ohio
Reg: 12-17-06
10-10-24 12:41 PM - Post#2874556    
    In response to bobb

All I have ever read was small gaps but your using long gap. Im at about .030

Jim

65' Impala SS, 65' Belair, 89' Silverado Z71, 95' Silverado Z71, 12' Silverado, 15' Silverado LTZ, 16' Tahoe LTZ


 
Magnetocheck 
"2nd Year" Silver Supporting Member
Posts: 530
Magnetocheck
Age: 70
Loc: Charlotte, NC, USA
Reg: 09-05-22
10-10-24 02:34 PM - Post#2874560    
    In response to 995jim

Agree - looks pretty go to me but I don’t have any experience with boosted engines. Timing mark looks good. Get a real bright light and see if you can see down the space to view most of the porcelain. You may not be able to see the combustion line w/o cutting off the threads. Line should be almost down at the junction Make sure you check after a high speed run with minimal to no idling as that will soot them up

Bob
'65 Impala SS 396 Convertible
Member, National Impala Association
--It's weird being the same age as old people!


 
bobb 
Super Senior Member
Posts: 6828

Loc: paradise
Reg: 09-05-03
10-11-24 07:17 AM - Post#2874570    
    In response to 995jim

try it, it cant hurt.if you dont run at full power you wont know the difference. maybe like .045

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
grumpyvette 
Performance Subject Matter Expert --
Posts: 17803
grumpyvette
Age: 76
Loc: farmersville texas USA
Reg: 03-16-01
10-17-24 07:21 AM - Post#2874777    
    In response to bobb

Id really need a clearer photo to read the plug effectively, that picture looks like the plug was out of a car that had not been run in several days minimum.
post a clear picture of a plug you removed from a car that you ran briskly under load for several miles and I can get more info!

https://garage.grumpysperformance.com/index.php?th...

https://garage.grumpysperformance.com/index.php?th...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 


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