Tecdiverfl

I was out this morning for a ride with my 3 year old and she says Daddy pass that car. I drop it into 3rd and nail it. At 3800 rpm the car falls on it face. Its a 350 350HP 4speed. The Carb was done my Lars a few years back and has also ran great. I live in Fl and it was pretty hot out and I had a 1/4 tank of gas. I tried a few more times to jump on it and the same thing. Ingition in a Petronix Ignitor II and coil. Timing is set at 34 degrees. Any thoughts?

BOOT77

When is the last time you cleaned the carb? Could maybe be a plugged airbleed, might be worth trying to spray some carb cleaner down the bleeds.

htown81vette

Maybe the power valve needs replacing?

MrForce

are the secondaries opening?

Tecdiverfl

secondaries are definatly opening as the car was screaming until it nosed over

Bagmup

Exhaust backpressure? Could be even as trivial as a blocked air filter.

MotorHead

Could be 100 things, was this the first time you noticed it, have you nailed the gas recently and it was OK ? Clogged fuel filter comes to mind

dar322

flat tappet? what oil do you use? wiped cam lobe?

Tecdiverfl

Have nailed it many times and ran fine. Car has about 2000 miles since frame off and everything was replace. Tank, lines ETC. I am going to take it out this week when its not so hot and see if it happens again

badrad

I'd start with ignition, a weak one will run great until you jump on it.

qwank

check the fuel filter

PeteZO6

OP doesn't say what carb he has, but if stock Q-jet, it does not have a power valve.

Pete

mrmagrath

Clogged fuel filter?

keithinspace

I'm with Mr. Badrat. I'm thinking coil.

cv67

fuel pressure under load?

coil as said

valvesprings possible but unlikely being as its fairly new

Doubt anythings clogged.

usually something real simple

john 72-04

Also check the S hose from the feed line to the pump. If you have strait fuel line used it could be crimped. Get a S hose if the hose is crimped.

jackwabbit703

Not mean to hijack the thread but is okay for a 3 year old to be in a 2 seater in your state? I would love to take my 3 year old daughter for a spin in my vette.

** checked local laws on child restraint **

Didn't know law changed but it says for two seater, I'll have to use the "rear facing" method on the front seat (that's no fun).

keithinspace

I recall that both my kids were out of the rear-facing 5-point harness seats sometime during their 2's. Their feet started hitting the seatback, so we turned it around and got them 5-point harness front-facing seats.

I have to admit, putting that type of seat in the 'Vette would be a PITA. To make it easier, perhaps you could put a LATCH point somewhere in the luggage area...I'm sure the NCRS would understand...

LemansBlue68

If he has a Q-jet he does have an enrichment valve which performs the same function as the Holley power valve. And it's very possible the valve is sticking. This valve is essentially a spring loaded piston that is pulled down by manifold vacuum. When vacuum drops as the throttle opens the valve pops up and raises the main metering rods to allow more fuel flow. I do agree that it sounds like a fuel starvation issue or secondaries/air door not opening properly. The hazards of having a car that isn't driven regularly.

Tecdiverfl

I strap her in her car seat and my neighbor is a sherif
http://forums.corvetteforum.com/c3-g...-co-pilot.html

What is the best way to check the enrichment valve?