Re: 440-1 head upgrade
[Re: AndyF]
#2400046
11/07/17 05:30 PM
11/07/17 05:30 PM
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Joined: Oct 2006
Posts: 427 Sweden
Mopar Guy
mopar
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mopar
Joined: Oct 2006
Posts: 427
Sweden
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Talk to Dwayne at Porter Racing Heads. He has a lot of experience with the Indy stuff. Dwayne is where i also would turn to !!!!!
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Re: 440-1 head upgrade
[Re: AndyF]
#2400113
11/07/17 07:37 PM
11/07/17 07:37 PM
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Joined: Jan 2003
Posts: 10,007 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,007
Frostbitefalls MN (Rocky&Bullw...
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Talk to Dwayne at Porter Racing Heads. He has a lot of experience with the Indy stuff. The 2.25 valve and matching port work is as good as it gets. I tried a 2.3 valve and got zero gains and a $1,000 bill. Do you have enough motor to warrant the extra head work?
Last edited by gregsdart; 11/07/17 07:40 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 440-1 head upgrade
[Re: sgcuda]
#2400382
11/08/17 11:25 AM
11/08/17 11:25 AM
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Joined: Feb 2005
Posts: 20,178 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,178
PA.
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Not if they turn into sprinklers
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 440-1 head upgrade
[Re: 301v]
#2400467
11/08/17 01:33 PM
11/08/17 01:33 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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I don't recall having a 325 and 345 in the shop at the same time, but my perception of the two different port configurations is that the 325 short turn shape and height is different enough from the 345, that I'm not sure a 325 can be made turned into the Indy cnc345....... Not exactly anyway. It seemed to me as though the floor on the 325 was slightly lower, and rounder.
Might be worth a call to Indy and see what they say.
The exhaust ports and chambers are the same between the two.
I have put 2.25's in the 325's before, and that usually gets them to flow very closely to the 345's up til about .700 lift or so, then the 345 starts to pull away.
Depending on the overall combo....... Even 345's can be pretty small for a high effort 572.
I'll also add that if the OP's 325's are as delivered from Indy, if they are like every other set of those I've seen...... Then there is some flow left on the table.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 440-1 head upgrade
[Re: 301v]
#2400483
11/08/17 02:01 PM
11/08/17 02:01 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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I would def put the 2.25's in when they get freshened. Maybe try some 1.6 or 1.65 intake rockers too.
As an example-
A- ootb cnc 325, Indy valve job and valve B- cnc 325 with PRH valve job and blend, 2.25 Manley valve C- cnc 345 with PRH valve job and blend, 2.25 Manley valve
Lift--------A/B----C .100---71.9/75.9----76.1 .200--142.7/153.7-153.8 .300--210.3/217.1-217.9 .400--268.3/275.1-277.1 .500--313.7/326.9-327.6 .550--325.0/343.2-345.9 .600--332.6/356.8-358.3 .650--340.2/362.3-368.3 .700--349.6/364.2-377.8 .750--355.3/371.5-381.7
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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