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Username Post: best spark plugs for 350 engine        (Topic#200005)
tikiwagon 
Senior Member
Posts: 402

Loc: dorset, england
Reg: 04-23-04
10-01-08 01:41 PM - Post#1533147    

Hi have just rebuilt a 1971-72 350 engine to go in my camino,I seem to have 2 different sets of spark plugs to go in it(accel 8178, 566 resistor and champion rv17yc)what would be the best ones,The champions are slightly longer tips and both are the later taper seat type for 71 on engines.The engine is a street driven engine with mild cam, ported heads and edelbrock 600 carb going through a th350 box.just wondered if on e set is better than the other and what heat range are they?
ThanksDave

 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
10-01-08 03:25 PM - Post#1533215    
    In response to tikiwagon

As one set is longer than the other, your only choice is the one that fits in the heads. You really have to measure the heads for depth of the metal of the hole and that is th correct sparkplug. You don't want the threads to go any further than the end of the hole or the carbon that gets deposited on the interior of the CC will mkae it extremely difficult to remove the plugs. In addition, you may get the end of the plugs so far in that they will hit the piston tops. If you don't go far enough in, then the plugs will be shrouded and not work well. In addition, you will get carbon on the threads of the head and that again will have the same effect when you put in the correct length plugs.

 
tikiwagon 
Senior Member
Posts: 402

Loc: dorset, england
Reg: 04-23-04
10-02-08 12:52 AM - Post#1533511    
    In response to 52chevybob

Both sets were sold to me as correct for this engine.

 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
10-02-08 07:53 PM - Post#1534132    
    In response to tikiwagon

It could be that neither set is the right length!
I'll also note that one set isn't for that set of heads - it is the heads that are important here, not the block or car.

 
raycow 
Honored Member
Posts: 18281

Age: 71
Loc: San Francisco, CA
Reg: 11-26-02
10-02-08 08:30 PM - Post#1534163    
    In response to tikiwagon

Reading between the lines here, I am thinking that both plugs have the same length of thread, but the electrode sticks out farther on one of them. Am I close?

Ray
Bacon is the gateway drug for vegetarians - Bridget Lancaster


 
tikiwagon 
Senior Member
Posts: 402

Loc: dorset, england
Reg: 04-23-04
10-03-08 12:01 AM - Post#1534242    
    In response to raycow

Yes thats right,The champion plugs have a longer electrode/tip than the accel ones,I just looked at the champion website and they say the are the right ones?

 
ratnfested 
Valued Contributor
Posts: 2924
ratnfested
Loc: Rochester, NY. USA
Reg: 03-13-00
10-03-08 07:20 AM - Post#1534365    
    In response to tikiwagon

Neither. I only run champion in my lawn mower. Run AC delco plugs and you'll be happier. R45TS is a good plug for that motor unless you juice it then run R43TS. Older higher mileage engines I use R46TS so they do not fowl as easy.
Philip Ferrera
1977 Chevelle
1977 Malibu Classic
1986 Grand Prix
1995 Tahoe
2003 Impala LS
2004 Ski Doo REV
Street Machines of Rochester NY


 
tikiwagon 
Senior Member
Posts: 402

Loc: dorset, england
Reg: 04-23-04
10-03-08 08:58 AM - Post#1534442    
    In response to tikiwagon

I just realized that the heads are later ones from a gm crate motor (#33417369)Made in mexico 1990 onwards,with 76cc chambers that have been ported and polished so i really need the best plug suitable for these.

 
Petroholic 
Contributor
Posts: 839
Petroholic
Loc: Moses Lake, Wa.
Reg: 08-12-05
10-05-08 07:49 PM - Post#1535957    
    In response to tikiwagon

Not to steal this thread but, How about plugs for a mild 383?
About 9:1 ,dish pistons cast iron Vortec heads, probably 600 Edelbrock performer, Performer EPS manifold, stock HEI, maybe MSD module.

Thoughts?



Edited by Petroholic on 10-05-08 07:50 PM. Reason for edit: No reason given.

 
68fastbak 
Contributor
Posts: 611

Age: 33
Loc: fort lauderdale fl
Reg: 08-03-08
10-05-08 08:20 PM - Post#1535982    
    In response to Petroholic

r45ts acdelco for 90 percent 350 ,some after market heads say to use r44 and if u have nos or forced induction a colder plug like r44 or 43 ive never used anything but delco and believe it or not i never had a bad plug on any of my engines if they foul theres something wrong with the way ur cars running like to rich carb or blowby


 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
10-06-08 04:15 PM - Post#1536519    
    In response to 68fastbak

The specific engine design will determine the heat range of the plug. As such, any particular statement on which plug to use is purely a recommendation on what to start with. The important part with plugs tho is to make sure that the plug is the right length of threads and the right type of seal at the top. After that, there are heat range choices as well as types of center electrodes.
The interesting thing is that a lot of the changes in the plug characteristics as to center electrode metal and so forth are more just to make the plugs last longer, supposedly fire the fuel mix better and so forth.

 
murfs66 
Senior Member
Posts: 1841
murfs66
Loc: So Cal San Diego
Reg: 03-20-06
10-07-08 12:14 PM - Post#1537122    
    In response to 52chevybob

Go with the stock AC delco's. I have never had any issues and they keep on ticking.....
Line-up.......
64 chevelle 350/350
64 chevelle SS "Project"
66 chevelle 350/350
66 ferd stang (wifes) had to be different!
http://www.picturetrail.com/murfs66






 
tikiwagon 
Senior Member
Posts: 402

Loc: dorset, england
Reg: 04-23-04
10-08-08 01:42 AM - Post#1537489    
    In response to murfs66

Thats okay but what is the best ones needed for a pair of 90 up goodwrench heads on a 71 350?

 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
10-08-08 05:41 PM - Post#1537995    
    In response to tikiwagon

what are stock on those heads?

 
68fastbak 
Contributor
Posts: 611

Age: 33
Loc: fort lauderdale fl
Reg: 08-03-08
10-08-08 08:09 PM - Post#1538077    
    In response to 52chevybob

call ur chevy dealer and tell them what u have and they will recomend some for u


 
tikiwagon 
Senior Member
Posts: 402

Loc: dorset, england
Reg: 04-23-04
10-09-08 12:22 AM - Post#1538147    
    In response to 68fastbak

Thanks but im in england and dont have any chevy dealers over here( the only chevys sold over here are daewoos branded as chevys(what a joke!)

 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
10-09-08 04:11 PM - Post#1538520    
    In response to tikiwagon

Find the head casting number and find out on the Mortec site (just put the casting number in Google and look for the one about the heads). That will tell you what the heads came on and then you can then go to the parts store and have them reference the spark plug number.
For the most part tho, there really aren't that many plug numbers that Chevy used on the SBCs.
Heat range is only a hopeful stab at what will work and you really need to check that the plugs are running well after a time. Other things like platinum, splitfire and so forth are more gimmicks for extending the life than anything else.

 
CherryCoke 
RIP
Posts: 1613
CherryCoke
Loc: Toledo,Iowa
Reg: 12-01-00
10-10-08 07:19 AM - Post#1538921    
    In response to tikiwagon

TikiWagon,Its funny you mentioned Daewoos, a Korean car, I have a 60 Imapala,original Ermine white,when we had a paint tech match useing a piece of the car,in a computer,it comes up 1999 Daewoo.........what a piece of crap,now were already changing car paints names to be PC and in line with the rest of the socialist world,,MO...
1960 Impala "More Door HT" 350/350 full power,Continental Kit,"My Dream Machine"

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