Potential of ported Edelbrock Performer RPM’s 6025’s

General engine tech -- Drag Racing to Circle Track

Moderator: Team

thomas butt
Pro
Pro
Posts: 208
Joined: Sat Mar 08, 2014 12:35 pm

Potential of ported Edelbrock Performer RPM’s 6025’s

Post by thomas butt » Mon Apr 09, 2018 9:42 pm

I’d like to try and find how these where ported. I picked up a set of Edlebrock Performer RPMs when I bought a 91 Mustang last month and am curious if the port work done looks good. I didn’t pay much attention to them until I noticed that they milled them below the intake valve and now am curious to find out what type of springs they have and what potential they have on an NA 317” Ford
You do not have the required permissions to view the files attached to this post.

thomas butt
Pro
Pro
Posts: 208
Joined: Sat Mar 08, 2014 12:35 pm

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by thomas butt » Mon Apr 09, 2018 9:48 pm

Exhaust
You do not have the required permissions to view the files attached to this post.
Last edited by thomas butt on Mon Apr 09, 2018 9:58 pm, edited 1 time in total.

thomas butt
Pro
Pro
Posts: 208
Joined: Sat Mar 08, 2014 12:35 pm

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by thomas butt » Mon Apr 09, 2018 9:56 pm

More pics. The intake port is 1.1”x2.0”. It looks like they concentrated on the bowl.
You do not have the required permissions to view the files attached to this post.

thomas butt
Pro
Pro
Posts: 208
Joined: Sat Mar 08, 2014 12:35 pm

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by thomas butt » Mon Apr 09, 2018 10:04 pm

Milled a lot? Looks like they might have...
You do not have the required permissions to view the files attached to this post.

cpmotors
Expert
Expert
Posts: 894
Joined: Fri Feb 15, 2008 8:22 pm
Location: Janesville,Wi
Contact:

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by cpmotors » Mon Apr 09, 2018 10:16 pm

That looks like more of a sand roll than any actual porting. The valve job and chamber needs attention IMO.
Pete Graves
CPMotorworks,Inc.
Custom Engine Machining
Cylinder Head Fixture for Vertical / Surfacing Mills

NXBOY
Member
Member
Posts: 91
Joined: Wed Sep 14, 2016 5:31 am

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by NXBOY » Mon Apr 09, 2018 10:36 pm

There good for about 550 HP if ported correctly. 270 cfm with about 175-180 cc runner. Biggest gains is sizing Intake bowl to the valve if it has a 2.02 as it is the same size on the 1.90 and 2.02 head ,just the seat cut bigger, Working the Short Turn and doing the chambers is your biggest gains. Any casting flash removed will help. Small cam back cut the valve. I own two sets of them heads. Looks like adding the 2.02 valve and bowl work wont be possible, looks like the seats been milled too far!

thomas butt
Pro
Pro
Posts: 208
Joined: Sat Mar 08, 2014 12:35 pm

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by thomas butt » Mon Apr 09, 2018 10:51 pm

NXBOY wrote:
Mon Apr 09, 2018 10:36 pm
There good for about 550 HP if ported correctly. 270 cfm with about 175-180 cc runner. Biggest gains is sizing Intake bowl to the valve if it has a 2.02 as it is the same size on the 1.90 and 2.02 head ,just the seat cut bigger, Working the Short Turn and doing the chambers is your biggest gains. Any casting flash removed will help. Small cam back cut the valve. I own two sets of them heads. Looks like adding the 2.02 valve and bowl work wont be possible, looks like the seats been milled too far!
Ok. Good to know. I measured the intake and it was 2.02”. I have never had these heads before so don’t know what to look for. Can you tell what type of spring they used? How much do you think they were milled?

thomas butt
Pro
Pro
Posts: 208
Joined: Sat Mar 08, 2014 12:35 pm

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by thomas butt » Mon Apr 09, 2018 10:57 pm

cpmotors wrote:
Mon Apr 09, 2018 10:16 pm
That looks like more of a sand roll than any actual porting. The valve job and chamber needs attention IMO.
....good to know. Here is another of the chamber
You do not have the required permissions to view the files attached to this post.

mag2555
Guru
Guru
Posts: 2264
Joined: Sun Sep 18, 2011 11:31 am

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by mag2555 » Tue Apr 10, 2018 6:30 am

I have seen many a darn good looking port polished up at home that flowed less then out of the box!
Get it flow tested or if you build with them you will have no base line to judge from!

MTENGINES
Pro
Pro
Posts: 407
Joined: Wed May 23, 2012 1:52 am
Location: MN

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by MTENGINES » Tue Apr 10, 2018 9:59 am

or at least knock down the huge ridge into the combustion chamber. or new seats with a favorable top cut

MTENGINES
Pro
Pro
Posts: 407
Joined: Wed May 23, 2012 1:52 am
Location: MN

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by MTENGINES » Tue Apr 10, 2018 10:03 am

MTENGINES wrote:
Tue Apr 10, 2018 9:59 am
or at least knock down the huge ridge into the combustion chamber. if they had to sink the valves, at least transition that top cut.

Carnut1
Guru
Guru
Posts: 3566
Joined: Tue Jun 11, 2013 6:32 pm
Location: Melbourne fl.

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by Carnut1 » Tue Apr 10, 2018 10:07 am

I see rust on those springs. They need to be junked!
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST

groberts101
Guru
Guru
Posts: 1561
Joined: Sat Mar 08, 2008 3:08 pm
Location: Minneapolis

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by groberts101 » Tue Apr 10, 2018 10:11 am

MTENGINES wrote:
Tue Apr 10, 2018 9:59 am
or at least knock down the huge ridge into the combustion chamber. or new seats with a favorable top cut
No doubt.

What's with the big gash, if that's what it is?.. in the fire deck above the intake valve? Weird place for chewed up valve bits to be banging around outside of the head gsskets fire ring and I'd guess severe overheated detonation after the fire ring lost it's battle. Probably also the reason they milled it so much too. Time to break out the welder, imo.
Last edited by groberts101 on Tue Apr 10, 2018 10:15 am, edited 1 time in total.

MTENGINES
Pro
Pro
Posts: 407
Joined: Wed May 23, 2012 1:52 am
Location: MN

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by MTENGINES » Tue Apr 10, 2018 10:11 am

groberts101 wrote:
Tue Apr 10, 2018 10:11 am
MTENGINES wrote:
Tue Apr 10, 2018 9:59 am
or at least knock down the huge ridge into the combustion chamber. or new seats with a favorable top cut
No doubt.

What's with the big gash, if that's what it is?.. in the fire deck above the intake valve?
its a sigh groove..lol

groberts101
Guru
Guru
Posts: 1561
Joined: Sat Mar 08, 2008 3:08 pm
Location: Minneapolis

Re: Potential of ported Edelbrock Performer RPM’s 6025’s

Post by groberts101 » Tue Apr 10, 2018 10:16 am

MTENGINES wrote:
Tue Apr 10, 2018 10:11 am
groberts101 wrote:
Tue Apr 10, 2018 10:11 am
MTENGINES wrote:
Tue Apr 10, 2018 9:59 am
or at least knock down the huge ridge into the combustion chamber. or new seats with a favorable top cut
No doubt.

What's with the big gash, if that's what it is?.. in the fire deck above the intake valve?
its a sigh groove..lol
Why do you say that? Because you "sigh" everytime yiu see one? LOL

Post Reply