Technical Another Factory Chevy BBC Holley 4150 Question

Another Factory Chevy BBC Holley 4150 Question

Double checked everything after rebuilding my Factory Holey 780 vac sec - everything looks good, should be ready to go

Starts right up, but it keeps backfiring through the carb when accelerating past idle

Any ideas?

Thanks!

 

Did you verify that you have a good pump shot coming out the squirter ?

 

Not yet - I ***umed that I did since it fired right up, but you know what happens when you ***ume anything …...

 

Sounds like you need to adjust the pump squirter arm.... .015-.020" clearance from wide open throttle....

 

If you have no pump shot double check your primary bowl gasket to make sure it has the hole for the pump p***age. also make sure the restrictor under the squirter is free and not stuck in the bottom of the bore.

 

Thanks for the suggestions!

I did notice that the squirter gaskets in the kit were metal instead of cork - looking closely at the photo on Summit's website it looks like Holley changed their design of the squirter to utilize the metal washer in a recess like with the new carbs. I guess Holley would rather sell you a new squirter/bolt ***embly than a $1 gasket ….

I'll check them out after church & let you know what I find out

 

????.......???

 

I have not seen cork squirter gaskets in many many moons. I have never seen metal gaskets , now that you say they are metal now also . Kinda looks like I’m in a 3/4 time wrap , stuck there .


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Well, discovered a different issue when I started the car today - smoke, then a small fire in the engine compartment.

Put it out (always keep an extinguisher handy!) and discovered a melted starter harness. Was running fenderwell headers for years, then switched to ch***is last winter - I guess that the wiring was too close. Net result - fryed starter harness with (1) conductor welded to header & killed the engine.

Removed the fryed wiring & will re-route it tomorrow to avoid the headers all together.

My thought is that the intermittent short was causing the backfire - what are the chances that I'm right?

Oh yeah, everything looks good with the squirter

Thanks

 

No update - picked up wire this morning to redo the starter harness - had to cut the gr*** since the next two days are calling for rain.

Am I correct thinking that the shorting could be the likely cause of the miss?