Thread: shooter size?

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Hi, I have been browsing this forum and have allready picked up some GOOD info. There are still some specifics I have ? about. My 350 isn't radiccally built, just a few extras. One thing I'm wondering is, I had a big hesitation on take-off-not stomping it but goosing it a little so I put a .035 nozzle in place of the .031 that came on my holley 600cfm with vac. sec. Doesn't stumble quite as bad but still hesitates. Have a summitt cam-204*in- 214* ex, lift is .420 in- .442 ex. @ .050. Do I need to step up to .037 shooter to get rid of hesitation or am I looking in the wrong direction?Motor was just bored .010 for rebuild 2 yrs. ago with Weiand intake, Hei dist. and Accell coil. Also thinking about roller rockers to replace stock 1.5's. Not an expert but not total idiot on motors . Anyone got any thoughts on where I should go from here?

Originally Posted by burrbrian

Hi, I have been browsing this forum and have allready picked up some GOOD info. There are still some specifics I have ? about. My 350 isn't radiccally built, just a few extras. One thing I'm wondering is, I had a big hesitation on take-off-not stomping it but goosing it a little so I put a .035 nozzle in place of the .031 that came on my holley 600cfm with vac. sec. Doesn't stumble quite as bad but still hesitates. Have a summitt cam-204*in- 214* ex, lift is .420 in- .442 ex. @ .050. Do I need to step up to .037 shooter to get rid of hesitation or am I looking in the wrong direction?Motor was just bored .010 for rebuild 2 yrs. ago with Weiand intake, Hei dist. and Accell coil. Also thinking about roller rockers to replace stock 1.5's. Not an expert but not total idiot on motors . Anyone got any thoughts on where I should go from here?

keep in mind to much fuel will cause the same problems as not enough. some things to check, timing, crab. pump, pump cam and nozzle. kick the timing up a few degrees and see if it helps.

Will do. Have had set at 8* btdc and seems pretty smooth there but will bump it up a little and see what happens. Thanks for getting back to me.

Okay, finnally got to try playing with it and bumped timing to 10* btdc and has just a little "gulp" now,thinking maybe pump cam to give a little quicker shot? Forgot to mention that carb is fairly new, just bought in april, but before the camshaft change. Didn't hesitate then which is why went with the larger nozzle. Sorry for long delay but mother nature and mr. boss have tied me up this last week.

My hesitation was caused by an improperly connected vacuum advance. I had it exposed to manifold vacuum which meant it put full advance on at idle. Give it a little throttle, manifold vacuum drops, your timing pulls out, the engine bogs... You need to hook it up to a port just above the throttle plates so it sees manifold vacuum at part throttle and above, but not at idle.

Have heard cases for both ways on the vacuum line. Holley advises ported but there are a lot of guys that say manifold vac.Will try it out and see what works for me and let you know soon as I can. Thanks for your input.

Nope, don't want manifold vac, that will give you too much timing at idle. You shouldn't have more than a few degrees of advance from the vaccum advance at idle, if any at all.