what gap??? please help asap

[otisringle]

tuning up my engine tonight. I need to know what is the proper gap on a spark plug for 1990 blazer 350 tbi?

any other pointers for a basic truck tune up?

any info will be great, not to sure what im really doing sadly to say!

 

[blazin_blazer]

should be listed on the sticker on radiator support...the 1 that shows belt routing..iirc...

 

[otisringle]

I dont have that anymore, I ran into a tree a while back and had to get an aftermarket grile support and the whole bit.

 

[4X4HIGH]

.045" will work good. I'm pretty sure that is spec on my 89 TBI

 

[Dafey]

[HIJACK/]
What about a 77 350?
[/Hijack]

 

[4X4HIGH]

Same, .045"

 

[lak2004]

I thought tbi was .035" I believe that is what tbichips.com uses anyway, maybe other reasons?

 

[otisringle]

well, I put them at or around .045 give or take a little. Hopefully all goes well when I start her up in the morning. Vistiting the parents so I dont wanna start the truck up and make noise like I used to back in the day. They need their rest lol

 

[Thunder]

OEM Spec on truck TBI is .035. Calif trucks may spec .045. Because of stricter emissions. But I run mine at .042 with MSD coil. Seems to work best there.

 

[badmix]

.045 1984 305cid carb'd

 

[4X4HIGH]

Actually, the larger the gap is that the plug will still fire is the best as it makes the hottest spark and helps to burn more of the fuel. I just took a look at my underhood sticker and spec for a 1989 Ca. blazer with a 350 TBI is .035" as you've stated. I still run mine at .045" and i'm also running a complete MSD system which is always a help as well.

 

[lak2004]

Settles it for me!

 

[Cowboy_80]

I've always ran .035, but the wider the gap, the hotter the spark. try .045 first.