Holley 300-261

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
GM-DR
Member
Member
Posts: 118
Joined: Mon Nov 16, 2009 6:41 pm
Location: Iowa

Holley 300-261

Post by GM-DR »

Anyone here have any experience with this manifold -------Considering for a 2 bbl 500cfm drag motor 360ci 9.8-1 262/266 .550lift ported 441 heads currently using Victor 4x4--RPM Range 5000-7300---Dyno 452@6200rpm Have also considered VicJr Thanks for any feedback
Newold1
Guru
Guru
Posts: 1963
Joined: Fri Apr 08, 2016 9:50 am
Location:

Re: Holley 300-261

Post by Newold1 »

What is the port opening size as ported on your 441 heads?

Do you know the flow numbers for your valve size as ported?
The Older I Get, The Dumber I Get :wink:
GM-DR
Member
Member
Posts: 118
Joined: Mon Nov 16, 2009 6:41 pm
Location: Iowa

Re: Holley 300-261

Post by GM-DR »

Port size is 1.18x1.95-------do Not Know the flow #s
Newold1
Guru
Guru
Posts: 1963
Joined: Fri Apr 08, 2016 9:50 am
Location:

Re: Holley 300-261

Post by Newold1 »

Use the Holley 300-110 intake with a taller height and better transition from a 2 barrel adapter.

You will be glad you did! :wink:
The Older I Get, The Dumber I Get :wink:
DCal
Expert
Expert
Posts: 769
Joined: Fri Aug 11, 2006 11:37 am
Location: mooresville nc

Re: Holley 300-261

Post by DCal »

I ran that Victor 4+4 years ago and almost any manifold is better that that. For instance, I borrowed a Vic Jr and it was .15 quicker than the 4+4, had to return the Vic Jr and the car slowed down .15
Walter R. Malik
Guru
Guru
Posts: 6353
Joined: Tue Jul 24, 2012 11:15 am
Location: Roseville, Michigan (just north of Detroit)
Contact:

Re: Holley 300-261

Post by Walter R. Malik »

DCal wrote: Fri Nov 16, 2018 6:16 pm I ran that Victor 4+4 years ago and almost any manifold is better that that. For instance, I borrowed a Vic Jr and it was .15 quicker than the 4+4, had to return the Vic Jr and the car slowed down .15
On the 4412 carbed circle track engine we dyno tested it ... the Professional Products #52032 was slightly more powerful everywhere at wide open throttle. Part throttle transition and driving quality were not tested and that sometimes means more than a little bit of power.
http://www.rmcompetition.com
Specialty engine building at its finest.
User avatar
BOOT
Guru
Guru
Posts: 2895
Joined: Fri Apr 09, 2010 6:23 pm
Location: Michigan

Re: Holley 300-261

Post by BOOT »

I saw something on FB bout this intake the other day and almost made my own post, thought it said it was new. I'd like to see a test vs a air gap style high rise dual plane with a more street/strip combo, hardcore race combos will still favor the larger single planes I bet.
https://www.holley.com/products/intakes ... ts/300-261 300-260 is the multi port version
Channel About My diy Projects & Reviews https://www.youtube.com/c/BOOTdiy

I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!
Post Reply