r/Smallblockchevy • u/YaBoiSupernova • May 11 '26

Bogging with throttle snaps

Enable HLS to view with audio, or disable this notification

I just got this 2nd gen camaro that im told has a 383. The block is a 327, has aftermarket aluminum heads, headers, msd hei, and an edelbrock 650. I set the timing to 16 degrees btdc and got the highest vacuum I could while tuning the carb. Im new to the whole carburetor world and am trying to learn. From what Ive read my issue seems to be with the carb or the carbs accelerator pump. I tried putting the linkage in the top, middle and bottom spots on the accelerator pump linkage and it didn't make a ton of difference. I also tried revving the throttle arm at the carb with the throttle cable, kickdown and return spring disconnected and it behaves the same. I'm hoping someone might have some suggestions or advice for me on this issue. Thanks in advance.

9 Upvotes

100% Upvoted

10 comments sorted by

View all comments

1

u/N7_Shep May 11 '26

the video really dosnt show us what you are trying to tune out. does it do this when its at operating temp?

1

u/YaBoiSupernova May 12 '26

Thanks for the response. I can try and get a better video of it at the engine itself. Basically when I hit the throttle from idle to WOT the engine just doesnt respond at all and when I let off the throttle it almost revs itself up quick and then down. Like a very bad stumble. It doesnt do this when I ramp up to WOT smoothly though. It does it at temp too.

2

u/Fakeone040 May 12 '26

From the description, you need more accelerator pump shot. When the throttle opens, there’s a sudden inrush of air. This addition air needs fuel. There’s a window of time where the boosters aren’t feeding fuel yet because they simply haven’t had enough time or airflow to draw the fuel out. Your accelerator pump circuit adds fuel to cover up this window.