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scicala · 07-09-2021, 03:14 PM

The original primary jet size for a 8007 390 Holley is #51. I would stick with that. Also, a #50 is only .001" smaller (2% smaller).

Sal

07-09-2021, 03:14 PM	#14
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,801	Re: Holley 390 CFM Accelerator Pump The original primary jet size for a 8007 390 Holley is #51. I would stick with that. Also, a #50 is only .001" smaller (2% smaller). Sal