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New Plugs

 
78TransAm400 78TransAm400
New User | Posts: 26 | Joined: 12/13
Posted: 12/21/13
09:16 AM

Hey everyone,

I have a 1978 Pontiac Firebird Trans with a 400 L78 W-72 engine linked with a 4 speed Borg & Warner Super T10. I'm currently running just the basic Autolite replacement plugs that I put in about a year or two ago (8k miles on them). I recently upgraded my stock GM HEI system to an Accell Street Fire system, but I still have stock plugs and wires on it.

Any suggestions for what type of plugs and wires are best for this application? I was thinking Bosch Platinum 4's or the E3 plugs and for wires maybe a nice 8.5mm Taylor or MSD set.

Thoughts?

Accell Street Fire HEI system
1379520 589165461119081 688216899 N

The Car
1454889 608313239204303 1199213896 N  

shyrgfuh70 shyrgfuh70
User | Posts: 93 | Joined: 12/13
Posted: 12/21/13
12:49 PM

nice car

is that florida?

your current wires are fine imo.

taylors are nice

i would not run e3 plugs

a thin wire electrode plug might be nice.

bosch are good

i think you can run a wider plug gap with your heai like around .045" please confirm.

if you gap a thin wire plug be very careful not to damage the electrode.  

78TransAm400 78TransAm400
New User | Posts: 26 | Joined: 12/13
Posted: 12/21/13
03:56 PM

shyrgfuh70,

Yes it's in Florida, took that on a cruise in Clearwater, and thanks for your compliment. It's all original paint and number matching, it just needs some extra power to kill off some civics since I won't change the 6X heads, I need power elsewhere.

Actually the stock plug gap is .60, so with an upgraded HEI, I figured I could widen the gap to maybe .70 or even .75, but I also worry about clearance inside the cylinder...don't want to slap a piston head with a plug Tongue

You really think those wires are good enough though, their stock GM replacements. I was thinking BOSCH platinum 4's, but you can't gap those...their factory gaped.  

Pontiacman8 Pontiacman8
Moderator | Posts: 5777 | Joined: 02/08
Posted: 12/21/13
04:05 PM

No, leave it at .060 that is big enough gap to jump.

The ac delco plugs work great.
I just installed some E3 plugs in a chevy 350 and they work well for now,but haven't had them in there long.

Don't like the bosch plugs had problems with them fouling out easy.  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

shyrgfuh70 shyrgfuh70
User | Posts: 93 | Joined: 12/13
Posted: 12/21/13
05:33 PM

Yes it's in Florida, took that on a cruise in Clearwater,


thought so, i know that bridge. Arnold Schwarnegger did a movie on that road as well as many others have.


xxxxx


nd thanks for your compliment. It's all original paint and number matching,


i want it.


xxxxx


it just needs some extra power to kill off some civics since I won't change the 6X heads, I need power elsewhere.


i'm terribly sorry to say that if you are referring to the civic guys that put 25k in their engines then unfortunately you might as well give up now.

IF YOU STILL WANT TO TRY, I SUGGEST A SUPERCHARGER WITH AROUND 12 LBS BOOST AND A 200 HP SHOT OF NITROUS, LOL.


xxxxx


You really think those wires are good enough though, their stock GM replacements.


WELL PONTIACMAN8 DIDN'T SAY ANYTHING ABOUT THEM SO I STILL THINK SO.  

78TransAm400 78TransAm400
New User | Posts: 26 | Joined: 12/13
Posted: 12/21/13
10:51 PM

.  

78TransAm400 78TransAm400
New User | Posts: 26 | Joined: 12/13
Posted: 12/21/13
10:51 PM

Those 25k invested Civics are fast....very fast being so light. With that said I was recently able to make America proud by smoking one of the highway. A few weeks ago on a Cruise with around 200 vehicles through Clearwater, I had a 92' Honda Civic with a B16 Vtec running 10 PSI worth of boost try me from a rolling start at around 45mph, I down shifted to 3rd and he stood no chance. Nice guy, but I smoked his Civic Smile

I'm really debating if changing those basic Autolite plugs is worth the small gain, they only have around 8,000 miles on them, but they are the basic Autolite replacements.

I am getting the exhaust redone soon, going for true dual exhausts.

1491004 10203118329185840 112840522 N

Think I'll be able to gain any real power gains from splitting the exhaust into true duals?  

dond1965 dond1965
User | Posts: 116 | Joined: 12/13
Posted: 12/22/13
03:42 PM

i would HIGHLY recommend the use 0f moroso ultra 40 plug wires [very low ohm] and split fire spark plugs with their multiple ground paths and superior flame kernel generating capability, for smoother idle, less misfires and more power. Grin