Holley 4781 jet

Barnstorm · 07-27-2011, 08:11 PM

Just curious on how everyone jets their Holley 4781 850 dp's. We thought we knew.

Rich Biebel · 07-27-2011, 08:26 PM

They came from Holley with 80 jets squared and 6.5 PV's in both ends...

I ran one for years on 454 big blocks and blocked the PV's and ran 86's front and back.....

Footbrake or trans brake.........just had to tune the shooters and pump cam timing to suit your combo......maybe a bit more secondary jet in good air.....

07-27-2011, 08:11 PM	#1
Barnstorm Member Join Date: Dec 2009 Location: Minnesota Posts: 186 Likes: 0 Liked 0 Times in 0 Posts	Holley 4781 jet Just curious on how everyone jets their Holley 4781 850 dp's. We thought we knew.

07-27-2011, 08:26 PM	#2
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: Holley 4781 jet They came from Holley with 80 jets squared and 6.5 PV's in both ends... I ran one for years on 454 big blocks and blocked the PV's and ran 86's front and back..... Footbrake or trans brake.........just had to tune the shooters and pump cam timing to suit your combo......maybe a bit more secondary jet in good air..... __________________ Rich Biebel S/C 1479 Stock 147R