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Should I get my Indy-SRs ported?
#904434
01/14/11 03:53 PM
01/14/11 03:53 PM
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Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR
OP
top fuel
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OP
top fuel
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
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I've got a 440 in my Roadrunner with Indy SR heads, 11.5:1 compression, the dual-plane Indy intake, an 850 cfm Holley DP, forged slugs, and the TTI step headers. The cam is Comp's hydraulic flat-tappet .564"/.564" XE296HL grind with 251/257 duration. The car is primarily driven on the street, and only taken to the track once or twice a year. The heads are OOTB, with only an intake-match port (this is how they came from Indy). Without switching out cams, could I benefit from a mild port and polish or do the SRs probably flow well enough for my combo? Thanks in advance for any input. 
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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Re: Should I get my Indy-SRs ported?
[Re: mopardamo]
#904437
01/14/11 05:31 PM
01/14/11 05:31 PM
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Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR
OP
top fuel
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OP
top fuel
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
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Quote:
That is a great head and will do fine for your application. Since you did not state a goal or that it has not reached some goal and considering the street needs you are in a good position. I do not think spending money on porting would be a good return on investment.
Damon
I don't have any specific goals (other than to just go faster). I was just wondering if I'm losing anything because the heads can't keep up with the cam. Would I gain anything substantial by getting the heads mildly ported?
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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Re: Should I get my Indy-SRs ported?
[Re: 1968RR]
#904438
01/14/11 06:12 PM
01/14/11 06:12 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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send them to Porter. Oh yea there is gains to be had. The SR head is one of the best heads Indy makes IMO. Whats nice is the port can be much smaller than the -1 and flow similar numbers maxed out. 340-350+ cfm is the norm.
Porter can make the heads work well with some fancy valve job, back cut the valves make the low lift numbers Fat without hurting velocity and torque.
Maybe upgrade the rockers to faster 1.6-1.7 ratio to take advantage of the upper lift numbers without adding too much duration to the mix.
I personally like that cam, but I would take Porters advice on combo as a whole.
There is .5 and 8-10 mph in the heads alone ask me how I know...
Those was 8th mile times and gains for me. With head work, and new cam, everything else the same. But again this was a bracket car with lots of converter and gear...Compression was a modest 11.5:1 or so.
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Should I get my Indy-SRs ported?
[Re: tboomer]
#904440
01/14/11 07:04 PM
01/14/11 07:04 PM
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Joined: Jan 2003
Posts: 9,876
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,876
Weddington, N.C.
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 Talk to Dwayne, If I remember correctly Dwayne has a Valve job full-port work that really kicks up the .200 to .550 lift which would be perfect for what you need with that 251/257 Comp (Great cam, My buddy's 440 charger runs high 11's with 3.23 gears with that stick ). Check the tech archives under 'Big block Head Flow chart', SR(A) vs SR (B). That was several years ago and I'm pretty sure he's got a few new tricks that probably pick them up even more. Anotrher thing I know would help is just some very basic radius work in the lower plenum transitions in the awesome Indy 2D intake (same one I run on my 517" max wedge). Those mods for 11.5:1 ( combined with a larger cfm carb) could be a cost effective way to pick up at least another maybe 40+ hp....even though you probably won't feel much below ~4000 because my guess is you still have more than adequate airflow to around that point. A 1.6 rocker would also kick you up another .035 or so (near .600" lift), that might halp as well....at least onthe intake. My Charger is on youtube...type a search for wizerulz
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Re: Should I get my Indy-SRs ported?
[Re: pete walton]
#904445
01/15/11 03:50 PM
01/15/11 03:50 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I just got my Indy EZ heads from Duane Porter and all I can say is he does great work. I am the kind of guy who likes to do all my own work but I have no flow bench so I have never flow tested any port work of my own and I wanted to make the most power I can with this eng on pump gas. I know Duane knows what works best as no matter what you think Duane does this every day for a living and he can test all of his work so he knows what works best. He is a profesional in every way and I knew there is no way I can do heads anywhere near as good as him. So I went with the Indy EZ heads prepped and worked by Duane and I am not sorry at all. I also have a cam coming speced by Duane for my eng. Ya cant beat the best and Duane is the best so by all means I would let him work your heads for you. Ron
Last edited by 383man; 01/15/11 03:51 PM.
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Re: Should I get my Indy-SRs ported?
[Re: 1968RR]
#904446
01/15/11 03:50 PM
01/15/11 03:50 PM
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Joined: Aug 2003
Posts: 43,228
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Quote:
I've got a 440 in my Roadrunner with Indy SR heads, 11.5:1 compression, the dual-plane Indy intake, an 850 cfm Holley DP, forged slugs, and the TTI step headers. The cam is Comp's hydraulic flat-tappet .564"/.564" XE296HL grind with 251/257 duration. The car is primarily driven on the street, and only taken to the track once or twice a year.
The heads are OOTB, with only an intake-match port (this is how they came from Indy). Without switching out cams, could I benefit from a mild port and polish or do the SRs probably flow well enough for my combo?
Thanks in advance for any input.
considering what you have said and based on my personel expereinces in trying to make Mopar cars and wedge motors go quicker and faster the more air you give them(cams, heads, carbs, C.I. even) the faster and quicker(if your hooking up good to start with  ) the cars go What I'm trying to say is yes to your question of will it make more power by working on your heads, it may end up spinning the tires more  But if that happens that gives you something else to work on  Been there, done that
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Should I get my Indy-SRs ported?
[Re: Brian Hafliger]
#904452
01/15/11 08:39 PM
01/15/11 08:39 PM
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Joined: May 2003
Posts: 13,200
aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,200
aZLiViN
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Quote:
Quote:
jesus a stage 11 port job  whats step 1 opening the box they come in?
LOL...LOL...that made me laugh LOUDLY!!
 ... guess I saw that as a "II" not an 11. step one: open box... that's funny, I don't care who you are!!
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Re: Should I get my Indy-SRs ported?
[Re: J_BODY]
#904453
01/15/11 08:44 PM
01/15/11 08:44 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Indys old Super Modified port and polish is a joke, a buddy of mine showed me what was done, and posted a few pics years ago on here..
Its a basic window gasket match in the port a inch or so, thats it. maybe the valve job blended...
Think it was like $750 back then...
Were talking 10 years ago, before the CNC porting arrived.
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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