I think she needs MORE GAS (pics inside)

[1992suburban]

So I removed Govna' from clone all else is stock since it turns up higher rpms I think its goes lean up high


LOOK AT MY PLUG

should I wait till I get header and filter upgrade to drill jet out???

 

[Russ2251]

Is insulator that same color deep inside where it meets the metal spark plug shell?
May need a magnifying glass to see it clearly.

 

[1992suburban]

I think so.......... it also backfires when I let off after WIDE OPEN she is turnin 5500rpm

its lean I am sure of it..

 

[Russ2251]

I think so..........

Check carefully. Could be normal condition.
Looking down inside will reveal the truth.
Is backfire out of exhaust or intake?

 

[1992suburban]

pops back under decel. only at HIGH RPMs but runs GOOD

35mph @ 5500 rpms per the calculators

 

[Russ2251]

I would consider that normal.

 

[1992suburban]

exhaust..

 

[Russ2251]

Normal

 

[1992suburban]

OK.

 

[Russ2251]

Check full length of insulator. If it's white all the way down inside as described above, then go to next size larger jet.

 

[1992suburban]

i will check it again.. maybe tomorrow.

 

[Rickracer]

Looks just a wee bit lean to me, I'd go up about .002" on the jet size, you will definitely have to go up again when you do the pipe and air filter, but if you have a jet drill set, it takes about 15 minutes.