I pulled my Pass side header today. I noticed the number 2 primary (first on right side) had some black around the flange but the rest of the pipe was real clean compaired to the other 3 primaries. The # 4 was not as dirty as 6 or 8 but it was not as clean as #2.
Im wondering if it is possible to have a cylinder not firing properly? How would I check for this and what could be the cause. Fuel or spark, correct. IE Plug or wire or fuel injector?

When I pulled my plugs most of the had a yellowish color to them. This indicates that they are getting heated up fast under acceleration. Correct? What would I do to fix this? Colder plug, more gap less gap?
What else could I look at to see if I have a miss? Tomorrow I plane on looking at the top of the cyl threw the plug hole. I asl want to do a compression ck on all 8 cyl to se what Im running.

Also how much can you port the Hooker LT's? I see a lot of places where exhaust is hitting the flange or gasket rather than going down the primary.

 

Kmook thanks for the PM's How do I post my AF ratio graphs on the board?

 

Black around the flange means its leaking, thats all the info I can give.

 

Only the inner side of the flange is black where the heads are ported wider than the headers. The gaskets apear to have a indented seal from the torque of header bolts.

 

Whats the tube size on the headers?

 

Hooker LT Primary are 1 3/4 primary. 3 inch collector.
Can anyone look at my AF ration graph and tell me what they think?
How do I post the pictures?

 

Send me your A/F graph and I'll take a look.

 

I'd guess either a header gasket leak or a valve rocker too tight.

 

What do you think about dynoing 403.3 HP with 383 AFR 210 Heads and Comp 236 242 112 LSA cam with all bolt on and valve train work? Im thinking Im missing some HP some where

 

I thinking of going to a 4 inch stright threw muffler and I pipe set up. What do you think? Too much?