and if you are going for all out power, the singleplain seems to be superior, blower or not

After reviewing our standard policy of not allowing "bumping" of threads more than 45 days old, we have modified the rule to accommodate Technical threads and other threads (once reviewed by a moderator). The change to the existing policy now reads:

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How does the IAC passage help? As long as the IAC lets the necessary amount of air past the TB, doesn't that accomplish 90% of the task?

Just guessing, but the LT1 IAC passage lets air into a specific IAC circuit. If it just dumps out into the main plenum it causes a number of idle problems. I know Holley's original design for aftermarket throttle bodies had the IAC dumping into the plenum instead of the idle circuit and they had a ton of problems.

Seems like it should work, but apparently it doesn't.

Looks like Nathan beat me to it. :)

-- Joe

Sorry, I don't get it. My 1989 L98 plenum has two holes in it's "floor" (just behind the TB inlets) that feed over to one small runner. (NOT A 9th injector BTW).

It looks like air could go to the main runners, or get sucked down that special passage/runner. Maybe velocity is faster thru the smaller tube? Even if it is, does this atomize/improve things much? I just don't see it being significant.

I'd rather see good explanation vs something like "running like a turd". It just doesn't explain what's happening. It makes you think the only decent running (idling) intake is a stock intake. Other than this reference, I've not heard that.

gp

BTW: My understanding is the IAC adjusts air flow thru the TB by varying a plunger (pintle). The pathway (being variably blocked) flows from the hole in the middle of the TB to the back -- and around the gasket into the normal TB ports. Maybe early L98 or LT1 models are different?

Anyway, the varied amount of air helps speed/slow the idle base on engine demands (i.e., A/C running or gear selection on an auto). If it runs too slow, it might stumble, otherwise I'd think there wouldn't be a significant problem.

here is what i got after i sent a email to bbk about the intake which is part number 5014 btw

i remember when this was going to be released in winter 05. lol will it ever be ready?

For starters:

http://www.thirdgen.org/techboard/di...tml?highlight=


You are on the wrong site. Search thirdgen.org. 20 thousand more posts of every possible technical topic.

Just wait until you get into prom tuning.

-- Joe