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Did you find/fix those two missing grounds?

No I'm not myself lately huh... ;help :chuckle

Extending the exhaust tips past the rear bumper can go a long way towards reducing in-cab resonance.

Sorry for not replying yet...can't seem to find my FSM! Hate it when I put stuff away somewhere safe then forget where I put it! :L

No find and fix the missing grounds...these will cause you ALL kinds of trouble. Just from memory...check ground wires at the rear of the driver's side cylinder head, and on the driver's side of the transmission bell housing. I don't recall which is which...but those two locations ring a bell...

Sorry I just can't see spending 100 bucks to join a Corvette site when there are such good free ones...not to mention a GRAND for a "lifetime" membership. What happens if the site bombs and shuts down in 6 months...or in 6 years for that matter? Not a chance, even if I DID have money to blow!

Oh what fun! Where in Colorado are you?

I would agree with the previous two posts. In addition, some of us just enjoy the challenge...call us crazy but its fun. I came very close myself to going the LSx route with my '84, but eventually decided against it.

Wire for what? Inquiring minds wanna know...

The need for a "tune" has nothing to do with how much power the engine makes. Its simply different than stock...thus WILL require calibration.

Most definitely will require a calibration overhaul. Most folks do their own tuning. There is a system out there that converts a later dual-TBI ECM (late 80s early 90s) into a flash-based high-speed datalogging system that works well with the crossfire setup. For those that don't want to do...

There ain't a crossfire alive that would warrant that kind of flow. If its even a mildly modified xfire a stock L98 pump will be fine. I used a LT4 pump in mine.

Single sheet of gasket paper from the parts store is enough for the lid as well as both TB gaskets

I was hoping for a little more detailed info on the C4 conversion itself.

Yeah I'm familiar with the hydroboost system, and have been considering converting mine over. Thanks for the links!

"Hydroboost system"? More details?

An ECM grounding issue. Ground pins are: White connector: 12, 13, 14 Black connector: 11, 15 Battery voltage to the ECM is on white connector pins 10 and 15. I would check continuity between all of those ground pins and the negative battery terminal. It matters if the engine is running or...

Not sure how else the ECM could report a "wrong" battery voltage unless its defective. Could be a grounding issue I suppose. That MAP voltage of 4.9V....was that running or not running? (it matters a lot) The 100 ohms is across the CTS leads while disconnected from the ECM. You can measure...

WAIT hold on... If these measurements were recorded with the engine RUNNING...forget the distributor you have bigger problems. First of all...24.9V is VERY wrong, running or not. This MUST be investigated. Get a good 'ol digital volt meter and measure the battery voltage directly, running...

Yeah...24.9V? Also... I HOPE this data was recorded when the engine was not running (MAP 99.3kpa) Looks like it was as the IAC count is 80...a typical "park" count.