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Re: Home porting 5.7 hemi heads for Dummies?
[Re: Brian Hafliger]
#1382028
02/06/13 01:53 AM
02/06/13 01:53 AM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
Joined: Nov 2008
Posts: 833
MN
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This thread is starting to get out of shape. OP wanted advise with porting a G3 hemi at home, on his bench, stock valves and not all the bell's and whistle's that comes with custom port's and what not's.
Jerry Williams.
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: hemidup]
#1382029
02/06/13 09:14 AM
02/06/13 09:14 AM
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Joined: Jan 2003
Posts: 10,169
Frostbitefalls MN (Rocky&Bullw...
gregsdart
OP
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OP
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Frostbitefalls MN (Rocky&Bullw...
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Quote:
This thread is starting to get out of shape. OP wanted advise with porting a G3 hemi at home, on his bench, stock valves and not all the bell's and whistle's that comes with custom port's and what not's.
Good point. Maybe a discussion on what works and what is overkill for what I want to do is a good idea. I appreciate all the photos and full port pictures as well though. This thread will be a good one to tie into my other post on Gen III Hemis.
My main concern is in not hurting mid range torque if I can, and help the heads make as much over all hp as is possible with a build within my goals. The cam came out of a 392 cube drag pack motor, the pistons will probably be off the shelf items for about 10/1 compression, dual four setup from Edelbrock, and SRT8 exhaust manifolds. The crank is a 3.888 stroke, rods are 6.2 sbc.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: Brian Hafliger]
#1382030
02/06/13 10:28 AM
02/06/13 10:28 AM
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Joined: Sep 2003
Posts: 10,645
Houston, Tx
AlexP
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I Live Here
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Houston, Tx
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Very Nice! did you use a buffer on the chambers?
It's a micropolished chamber. It takes a little bit of work, but well worth the time.
Why? You should try back to back dyno testing that finish with a burr finish...even if power stays the same, your bsfc's will be better and the engine will use less fuel. Just an FYI...
Brian
Thanks but this works well for us.
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: gregsdart]
#1382031
02/06/13 10:44 AM
02/06/13 10:44 AM
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Joined: Jan 2003
Posts: 1,448
right between milan dragway & ...
Flite_727
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,448
right between milan dragway & ...
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Greg- I used this article & the accompanying pictures as a guideline for what I did. I was impressed with the results he got, with stock valves & some mild work. Basically just involves streaming the guide boss, blending the bowl to the valve job, & removing the pushrod hump on the intake. With heads & comp "268" cam, My '06 magnum picked up 8 tenths, & 7 mph. On street tires, stock converter & gears. I'll post pics of my hack job later when I get home. http://www.popularhotrodding.com/enginem...ew/viewall.html
'06 Magnum R/T Daily driver, 5.7 N.A.- [email]12.63@109[/email]
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: Brian Hafliger]
#1382033
02/06/13 12:01 PM
02/06/13 12:01 PM
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Joined: Jan 2003
Posts: 10,169
Frostbitefalls MN (Rocky&Bullw...
gregsdart
OP
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OP
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Quote:
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This thread is starting to get out of shape. OP wanted advise with porting a G3 hemi at home, on his bench, stock valves and not all the bell's and whistle's that comes with custom port's and what not's.
He also talked about a valve job and I kept in line with that. Telling him to not touch the ex. port floor isn't much advice 
Pictures never hurt as you provided some too. Stock valves may or maynot have their place in his build...
Greg, basicly what you want to do by cleaning the castings up is fine, just be careful not to break into a pushrod tunnel. Reason I posted the valve job pics is because that's where alot of flow is gained, and then blending the bottom cut into the bowl.
Next big power maker is the camshaft.
Are you coming down to the shop? I have some Hemi stuff in if you want to check it out 
Brian, I will try and get down there soon! Thanks Brian Jerry and Alex, the pics and other input will help someone, its all good 
I know that no particular head and porting combo will be best for all apps, but from my limited knowledge, figure the small port, slightly tricked up 5.7 heads make the most sense for what I am doing. Carbed, street converter with moderate stall speed of under 3500 rpm. Now on the other hand, if I had a BIG stroker, and FI, I would think the newer heads are better based on the fact that the factory thinks so too! With out actually putting it in the original title, that is some of what I had hoped to learn more about. What works where, and how well.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: gregsdart]
#1382034
02/06/13 07:03 PM
02/06/13 07:03 PM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
Joined: Nov 2008
Posts: 833
MN
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I relied with my tips and tricks of hand porting heads. Greg, The reason I stated "don't take any material of the floor of the exhaust port" is when I lost flow #'s. I think most head builder's would call this a point of diminishing returns? You will pick up 8-10 cfm on the exhaust side by ovating/D shaping the 5.7 Hemi exhaust port to match a round flange header vs a square flange.
Last edited by hemidup; 02/06/13 07:05 PM.
Jerry Williams.
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: hemidup]
#1382041
02/07/13 12:10 PM
02/07/13 12:10 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
master
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master
Joined: Jun 2005
Posts: 2,776
Ontario Canada
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A couple pic's of what was taken out with the die grinder.
Is that opened up to a 6.1 gasket size?
Nope. Port matched to an aftermarket 5.7 header gasket.
Sorry It was the picture of the intake. Can't figure out how to repost someone else picture. 
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: Flite_727]
#1382042
02/07/13 12:18 PM
02/07/13 12:18 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
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I Live Here
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Grand Haven, MI
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Nice job! Throw those on a bench and I bet they flow over 300 cfm @ .600" lift with stock valves.
Thanks! Coming from a 3G guru such as yourself, that's gonna make my head swell, thinking I should go into the porting business! 
well, judging from the Vizard article, ahalf-stoned trained monkey should be able to get 300cfm out of a gen1 5.7 head 
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Home porting 5.7 hemi heads for Dummies?
[Re: hemidup]
#1382044
02/08/13 11:06 AM
02/08/13 11:06 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
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Posts: 16,123
Grand Haven, MI
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http://www.popularhotrodding.com/enginem...ew/viewall.html posted above...the money quote "We spent a day and a half on the flow bench in an effort to find out what this head does or does not like in the way of port mods. We are sure there is much still to come, especially with some bigger valves, but we did find what it took to produce, at 600 thousandths lift, some 302 cfm on the intake and 195 cfm on the exhaust. As the nearby photos show the work to achieve this proved simple. In essence, the porting involves little more than just tidying up what Chrysler's engineers provided in the first place (great job guys)."
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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