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Re: MY JEEP BUILD THREAD
[Re: DusterDave]
#1061114
10/14/11 06:36 PM
10/14/11 06:36 PM
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Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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Quote:
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You can hog those magnum heads out some for sure. This is the best pic I could find at the moment. There is a large restriction in the bowl below the valve seat. You can see this comparison on the 2 Magnum intake valves pictured. On a well ported Magnum intake throat, a golf ball will snugly fit all the way in the port and sit on top the valve guide, where it will not even closely set that deep on a stock port. Don't mess with the short radius that much, but the other 3 walls of the port should pretty much go straight down from the valve seat, eliminating the bottle neck.
That's some great porting advice, and I really do appreciate it, but my goal (for this application) is making good low end torque, not big HP numbers. I'm looking to make around 300 HP, which will be plenty for the Jeep, and from what I've read, the stock heads are supposed to support up to around 400 HP.
Well, looking at your Duster, I suppose it was kind of goofy to try and suggest porting ideas to you anyway!  
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: MY JEEP BUILD THREAD
[Re: DusterDave]
#1061115
10/14/11 06:55 PM
10/14/11 06:55 PM
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Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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Quote:
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Just Throwing this out there... Right now Mancini has the Eagle SIR rods in the pressed pin version only, for $130 a set...
Edit: Oh yeah they're in the "overstocked" section.
I just looked. Holy Christ, that's cheap! Guess I'm buying a set of rods tonight too! My wife is gonna kill you all!!!!!!
Scat Cast Crank, SIR Rods, Icon Forged Pistons = one very economical stroker....!!!!!! Should be perfect for what your planning 
Who do you have in mind for the machine work & balancing....??????
Rickster
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Re: MY JEEP BUILD THREAD
[Re: DusterDave]
#1061117
10/14/11 10:28 PM
10/14/11 10:28 PM
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Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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273/318/340 all shared the same stroke and bearing sizes. 340's had heavier counterweights to work with heavier rods. They can be mixed and matched, but you should probably have a mixed cubic inch assembly balanced to make sure there are not vibrations. Magnums also used different rods (smaller at the wrist pin, lighter pistons) than LA's, to that's another reason to balance if you are mixing Magnum and LA.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: MY JEEP BUILD THREAD
[Re: rickstershemi]
#1061119
10/14/11 11:44 PM
10/14/11 11:44 PM
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Joined: Jul 2010
Posts: 1,845
Tampa
DusterDave
OP
top fuel
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OP
top fuel
Joined: Jul 2010
Posts: 1,845
Tampa
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Quote:
Quote:
Quote:
Just Throwing this out there... Right now Mancini has the Eagle SIR rods in the pressed pin version only, for $130 a set...
Edit: Oh yeah they're in the "overstocked" section.
I just looked. Holy Christ, that's cheap! Guess I'm buying a set of rods tonight too! My wife is gonna kill you all!!!!!!
Scat Cast Crank, SIR Rods, Icon Forged Pistons = one very economical stroker....!!!!!! Should be perfect for what your planning
Who do you have in mind for the machine work & balancing....??????
Rickster
I'd love to have Dan at Performance Only do the machine work and balancing. I hear good and bad things about every one of the machine shops in my area, which makes me uneasy about going to any of them. If Dan does the work, I know I can sleep nights knowing that everything is spot on. The only downside is, its a hell of a long ride to bring the parts down to his shop.
Alright, the Eagle SIR rods and Scat crank have been ordered. That was some money originally earmarked to go towards the gear change and lockers for my Dana 44's, so that part of the project got set back a few weeks, but the upside is, the engine program got pushed forward.
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Re: MY JEEP BUILD THREAD
[Re: DusterDave]
#1061120
10/15/11 08:03 AM
10/15/11 08:03 AM
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Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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Quote:
Quote:
Quote:
Quote:
Just Throwing this out there... Right now Mancini has the Eagle SIR rods in the pressed pin version only, for $130 a set...
Edit: Oh yeah they're in the "overstocked" section.
I just looked. Holy Christ, that's cheap! Guess I'm buying a set of rods tonight too! My wife is gonna kill you all!!!!!!
Scat Cast Crank, SIR Rods, Icon Forged Pistons = one very economical stroker....!!!!!! Should be perfect for what your planning
Who do you have in mind for the machine work & balancing....??????
Rickster
I'd love to have Dan at Performance Only do the machine work and balancing. I hear good and bad things about every one of the machine shops in my area, which makes me uneasy about going to any of them. If Dan does the work, I know I can sleep nights knowing that everything is spot on. The only downside is, its a hell of a long ride to bring the parts down to his shop.
Alright, the Eagle SIR rods and Scat crank have been ordered. That was some money originally earmarked to go towards the gear change and lockers for my Dana 44's, so that part of the project got set back a few weeks, but the upside is, the engine program got pushed forward.
I'm sure Dan would do a great job....I use "Mike Thompson Racing Engines" out of Naples (you see his stuff at all the race tracks in florida) and he's a racer himself. If you need anything holler
Rickster
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Re: MY JEEP BUILD THREAD
[Re: Jwilli500]
#1061122
10/15/11 02:33 PM
10/15/11 02:33 PM
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Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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Quote:
Almost makes me wish I had a 318 to build one! This would be great for my sons 82. I do have a 318 but its an NOS Long Block, so I dont wanna bore it. LOL
IMO you'd be better off starting with a 360 block....just makes sense to me if you don't have a block alraeady 
Rickster
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Re: MY JEEP BUILD THREAD
[Re: rickstershemi]
#1061123
10/18/11 10:21 PM
10/18/11 10:21 PM
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Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
dusturbd340W5
master
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master
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
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Dave if you are looking for someone local,give Kevin at Auto Performance Engines in Arburndale a call he does impeccable work and does quit a few mopars,even has a in house dyno.
For the most part he is a 1 man shop and does every thing him self in house except crank grinding.
Last edited by dusturbd340W5; 10/18/11 10:22 PM.
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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Re: MY JEEP BUILD THREAD
[Re: DusterDave]
#1061130
10/31/11 08:59 AM
10/31/11 08:59 AM
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Joined: Jul 2007
Posts: 11,836
Florida
mopar346
Let me tell ya about fat chicks!
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Let me tell ya about fat chicks!
Joined: Jul 2007
Posts: 11,836
Florida
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Dave,
I ran across these on the Jeep forum and didn't knwo if they would help with frame dimensions, so I thought I woudl share.
Good luck and keep up the post.
Careful, your character's showing!
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