I know that mod does work on those intakes. I had a friend back in the late 80's did that to his BBC Holley intake and it picked up so much ET he about fell over at the track. The guy doing them was overwhelmed with work for a while when the word got out. I need to practice more welding before I try that trick. Nice work by the way.GOSFAST wrote: ↑Thu Aug 06, 2020 2:10 am Not sure tonight the difference in the two intakes but I can give you this much on the 300-25, back in the mid '80's we began welding in some "fins" and did a little porting and was able to pick up about 30 HP. We saw it on the dyno and some close customers who used it picked up 3-tenth's at the strip!
See the photo below, on this one the "fin" work is finished and ready for the porting!
Thanks, Gary in N.Y.
P.S. Back in those days the 350" was much more prevalent than the larger SB inch units, we never got to really test it much on the 400" platform but figure it would perform as well with the "fins" installed. We still do a couple during the year, but not as many as in the past!
SBC Strip Dom-Mod A.JPG
SBC intakes Holley 300-25 vs 300-2
Moderator: Team
Re: SBC intakes Holley 300-25 vs 300-2
-
- Expert
- Posts: 732
- Joined: Sun Sep 28, 2008 11:06 am
- Location: Frostburg, MD
Re: SBC intakes Holley 300-25 vs 300-2
Do you need a mini tig torch to get at the side that is outboard? Or will a flex head #17 work?
Thanks
Thanks
-
- Expert
- Posts: 952
- Joined: Mon Jul 27, 2009 2:17 pm
- Location: Surrey, BC
Re: SBC intakes Holley 300-25 vs 300-2
1980RS, you were asking about my epoxy divider extensions on a Weiand 2575, I didn't extend them anywhere NEAR are far as the ones in the photos above, but the vertical shape of the leading edge in the photos is very similar to what I did. I could be totally out to lunch here, but it just feels wrong to extend the dividers that far into the plenum with a big bore spread like a Q-jet. I feel like you would be inviting fuel distribution problems, and I don't have a dyno to sort issues like that out.1980RS wrote: ↑Thu Aug 06, 2020 9:21 amI know that mod does work on those intakes. I had a friend back in the late 80's did that to his BBC Holley intake and it picked up so much ET he about fell over at the track. The guy doing them was overwhelmed with work for a while when the word got out. I need to practice more welding before I try that trick. Nice work by the way.GOSFAST wrote: ↑Thu Aug 06, 2020 2:10 am Not sure tonight the difference in the two intakes but I can give you this much on the 300-25, back in the mid '80's we began welding in some "fins" and did a little porting and was able to pick up about 30 HP. We saw it on the dyno and some close customers who used it picked up 3-tenth's at the strip!
See the photo below, on this one the "fin" work is finished and ready for the porting!
Thanks, Gary in N.Y.
P.S. Back in those days the 350" was much more prevalent than the larger SB inch units, we never got to really test it much on the 400" platform but figure it would perform as well with the "fins" installed. We still do a couple during the year, but not as many as in the past!
SBC Strip Dom-Mod A.JPG
-
- Expert
- Posts: 732
- Joined: Sun Sep 28, 2008 11:06 am
- Location: Frostburg, MD
Re: SBC intakes Holley 300-25 vs 300-2
snipped
Please describe the car and combo
[/quote]
Car is an 80 Camaro s.
[/quote]
Thanks
Please describe the car and combo
[/quote]
Car is an 80 Camaro s.
[/quote]
Thanks
Re: SBC intakes Holley 300-25 vs 300-2
I remember back in the NHRA "Super Modified" days, a couple of friends have Al Neal intakes with those "fins" in the plenum.GOSFAST wrote: ↑Thu Aug 06, 2020 2:10 am Not sure tonight the difference in the two intakes but I can give you this much on the 300-25, back in the mid '80's we began welding in some "fins" and did a little porting and was able to pick up about 30 HP. We saw it on the dyno and some close customers who used it picked up 3-tenth's at the strip!
See the photo below, on this one the "fin" work is finished and ready for the porting!
Thanks, Gary in N.Y.
P.S. Back in those days the 350" was much more prevalent than the larger SB inch units, we never got to really test it much on the 400" platform but figure it would perform as well with the "fins" installed. We still do a couple during the year, but not as many as in the past!
SBC Strip Dom-Mod A.JPG
"Quality" is like buying oats. You can pay a fair price for it and get some good quality oats,
or you can get it a hell of a lot cheaper, when it's already been through the horse.
Nil Satis Nisi Optimum
Ed Curtis - www.FlowTechInduction.com
or you can get it a hell of a lot cheaper, when it's already been through the horse.
Nil Satis Nisi Optimum
Ed Curtis - www.FlowTechInduction.com
Re: SBC intakes Holley 300-25 vs 300-2
How does the -2 compare to other lowered height single planes such as the Victor jr or team g?
-
- Guru
- Posts: 6353
- Joined: Tue Jul 24, 2012 11:15 am
- Location: Roseville, Michigan (just north of Detroit)
- Contact:
Re: SBC intakes Holley 300-25 vs 300-2
There are 2 different versions of the Holley 300-2 intake manifold; original and revised.
The style is sorta like the old Offenhauser Port-O-Sonic.
How any intake manifold would perform depends greatly upon the engine under it.
http://www.rmcompetition.com
Specialty engine building at its finest.
Specialty engine building at its finest.