Re: J head mods ?
[Re: Porter67]
#2532002
08/05/18 07:34 PM
08/05/18 07:34 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I think Steve Dulcich has some good porting on them. I would Google it. EDIT Google "dulcich porting articles"
Last edited by RapidRobert; 08/05/18 08:13 PM.
live every 24 hour block of time like it's your last day on earth
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Re: J head mods ?
[Re: Porter67]
#2533003
08/07/18 09:12 PM
08/07/18 09:12 PM
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Joined: Jan 2003
Posts: 1,765 Windsor, ON, Canada
Diplomat360
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,765
Windsor, ON, Canada
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A bit of a shameless plug here, take a look at this older post of mine... If you want to see more of the pics of the finished stuff let me know. I am no pro at this, but these were opened up pretty well while still retaining a smaller port volume.
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Re: J head mods ?
[Re: Porter67]
#2533032
08/07/18 09:58 PM
08/07/18 09:58 PM
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Joined: Jun 2014
Posts: 5,183
Porter67
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Thanks, I have seen that before. Porting is not new to me, but trying to squeeze a teener is.
I dont think the level of work for a teener would be the same as a good 360 or long arm build.
Ive managed to keep this a pretty simple build and that goes for the heads, just 13k mile castings, oem guides, I found a good single spring that works, ect...
Ive some new 318 castings but vs putting alot of work in them I figured id use the J heads with a little work.
I live at 4100 ft and with a intake closing point of 68-70 depending where I put it even with the 6cc dome and .028 gaskets im just about middle ground on things looking good on paper, I even took the block back in today to get .015 knocked off it which will get it to true zero, sucks a extra $100 just for 2cc.
I could of went with a bit more modern grind with alot lower intake closing point but ya know how hard headed some of us are.
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Re: J head mods ?
[Re: Porter67]
#2533045
08/07/18 10:32 PM
08/07/18 10:32 PM
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Joined: Dec 2009
Posts: 20,662 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,662
in a cattle trailer down by th...
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I would just open up the pocket to the valve job, and match the ports. Try to open up the pushrod pinch but don't go crazy there, it doesn't make a huge difference. Do not touch the port floors or the short side radius.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: J head mods ?
[Re: Porter67]
#2533049
08/07/18 10:42 PM
08/07/18 10:42 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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I wouldn;t even mess with J heads anymore
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: J head mods ?
[Re: Porter67]
#2533181
08/08/18 10:14 AM
08/08/18 10:14 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Fair enough, sounds more like it's a "I wanna see what I can do" project which is neat
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: J head mods ?
[Re: Porter67]
#2533223
08/08/18 11:51 AM
08/08/18 11:51 AM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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So. Burlington, Vt.
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I realize you already have the castings prepped, so those are what you’ll use...... but I would have preferred to use the 1.88 intake valve for that combo.
Actually, I would have probably used 1.94 sbc valves....... along with minimal bowl work and a tweak of the short turn. I’d have shot for flow in the 220-225 range.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: J head mods ?
[Re: cudaman1969]
#2533376
08/08/18 05:32 PM
08/08/18 05:32 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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YWhat's more impressive a 318 with iron heads that have 500 hours each of hand porting running 11.50s or aluminum heads out of the box running 11.00.
Fixed that for you. J heads are so wonderful they quit making them ~45 years ago. If you are going to mess with iron heads Magnums are a better choice.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: J head mods ?
[Re: Supercuda]
#2533388
08/08/18 05:49 PM
08/08/18 05:49 PM
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Joined: Jan 2004
Posts: 8,341 fredericksburg,va
cudaman1969
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Posts: 8,341
fredericksburg,va
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YWhat's more impressive a 318 with iron heads that have 500 hours each of hand porting running 11.50s or aluminum heads out of the box running 11.00.
Fixed that for you. J heads are so wonderful they quit making them ~45 years ago. If you are going to mess with iron heads Magnums are a better choice. Nope, didn't fix it, tell that to the 340 stocker guys. If you want to run fast, spend $20,000 on an engine. If you just want to have fun and run good, spend $0000. Js are perfect for his combo, aluminum is a waste of $2000. Now if he wants to ring it 9-10,000 rpm with no bottom end, go for it.
Last edited by cudaman1969; 08/08/18 05:51 PM.
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