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Author Topic:   J302 Cylinder Heads
Daniel Jones
Gearhead

Posts: 252
From: St. Louis, MO
Registered: Aug 99

posted 03-01-2001 08:20 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
Does anyone have any experience with the Alan Root J302 cylinder heads?

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Moneymaker
Administrator

Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 03-02-2001 10:33 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Dan, the only place that I have ever even seen any is at Kuntz's. He had some brand new casting sitting there on the shelf collecting dust for a while. I could call him and get his input for you if you like.

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 03-03-2001 11:43 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
These were the very first aftermarket heads available for the small block ford. They came out around 15 years ago and were sold as "AR" heads by Alan Root. They were WAY expensive in their day because they were the only game in town. These heads were later sold as the "J302" under the Motorsport name.

The exhaust ports have extremely wide floors which are too wide for most headers... so they are drilled for two different bolt patterns. The "AR" specific bolt pattern has the bolts offset, and was adopted by a lot of head porters who did serious exhaust work on later heads.

They are probably a decent head, but "AR" specific headers aren't that easy to find anymore. There's also been a lot of research and development since then. I don't have any direct experience with them, but sure did lust after them when they first came out.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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Daniel Jones
Gearhead

Posts: 252
From: St. Louis, MO
Registered: Aug 99

posted 03-04-2001 09:45 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
>Dan, the only place that I have ever even seen any is at Kuntz's. He had
>some brand new casting sitting there on the shelf collecting dust for a
>while. I could call him and get his input for you if you like.

If you get the chance to bring it up in conversation, that would be great
but don't go burning a long distance call just for this. I came across a
new-in-the-box pair for $500 and the price was too good to pass up. I'd
like to use them on my "project cheapskate" upgrade of my daily driver 5.0L,
instead of the spare DOOE castings I have. A co-worker wants to buy those
for $100 so I'm only out $400 for the aluminum heads and I don't need to
mill and drill them for studs and guide plates.

>These were the very first aftermarket heads available for the small block
>ford.

Except for the exotic stuff like the Gurney-Weslakes. It's a shame those
never made it into Ford's catalog. A local guy has a complete G-W set up
in a street rod. He runs the single 4 barrel intake manifold that was
developed for putting the G-W's in Mustangs but he also has the Weber/injection
adapters. I've got some pictures and articles that I'm scanning in. Neat
pieces. I think they pre-date the small block tunnel ports.

>They came out around 15 years ago and were sold as "AR" heads by Alan Root.
>They were WAY expensive in their day because they were the only game in town.
>These heads were later sold as the "J302" under the Motorsport name.

Yes. I found an article written when they first came out as the AR's.
They were developed for Root by Ken Duttweiler. The chambers are 58 cc's
and they nominally use 1.94"/1.6" Chevy valves. The assembled SVO J302's
came with 2.02" intakes. There's no provision for exhaust heat or EGR.
170 cc's intake port volume, 60 cc's exhaust. Dual exhaust header bolt
patterns for headers up to 1 3/4". Raised valve cover rail for roller
rocker clearance. Machined for screw-in studs and guide plates. Solid
bronze guides, grooved for oil seal retention.

Looking at my set, the intake port measures 1 1/4" wide by 2 1/16" tall
which I think is a bit larger than a DOOE's ports. It's certainly larger
than my C90X intake port, which only measures 1" wide by 1 13/16" tall.
The exhaust ports are much larger than the DOOE's and look quite nice.
Some of the studs go into the water jacket. Is that common with aluminum
small block heads?

>The exhaust ports have extremely wide floors which are too wide for most
>headers... so they are drilled for two different bolt patterns. The "AR"
>specific bolt pattern has the bolts offset, and was adopted by a lot of
>head porters who did serious exhaust work on later heads.

That is a point of concern for me. I have a set of the Motorsport 1 5/8"
stainless shorty headers on the car that I'd like to keep but I don't know
what the header port dimensions are. The exhaust port measures 1 7/16"
wide by 1 5/16 tall. It looks like a 1 5/8" tube would cover the port but
looking back through my old Motorsport catalogs, I see they had a specific
shorty header for J302's.

>They are probably a decent head, but "AR" specific headers aren't that
>easy to find anymore. There's also been a lot of research and development
>since then. I don't have any direct experience with them, but sure did lust
>after them when they first came out.

Searching the web, there do seem to be a number of J302 compatible headers
still available but they mainly look like 1 3/4" long tubes. Fel Pro carries
a header gasket for the J302's. It's p/n 1486 for J302 & K302 (Dual bolt
pattern, stock Ford and inline spread bolt Dart & TFS) Port Size: 1.40" x 1.40".

They look like a decent head but may not really work out for my daily driver
application. I think I'll see if any of speed shops in town have Motorsport
shorty headers in stock and do a fit check.

Thanks Much,
Dan Jones

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 03-05-2001 06:33 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
They look like a decent head but may not really work out for my daily driver
application. I think I'll see if any of speed shops in town have Motorsport
shorty headers in stock and do a fit check
---------------------------------------

They'll work fine for your daily driver. The 170cc intake port, along with the 58cc combustion chamber will be about right. If you can't find a set of "AR" specific headers, you can modify yours by grinding them out to size with a die grinder. If the header flange and tube look too thin for that, building them up with a few weld beads will solve the problem.... just don't get carried away and weld up the bolt holes.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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Moneymaker
Administrator

Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 03-05-2001 05:23 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I talk to Kuntz almost every day anyway Dan. I'll get his input for you.

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Daniel Jones
Gearhead

Posts: 252
From: St. Louis, MO
Registered: Aug 99

posted 03-05-2001 07:36 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
Thanks, Alex that would be great. I plan on bowl porting them but am trying to keep the feature creep to a minimum. The car's an '87 speed density Mustang GT and I'm trying to stay within the stock injectors, pump, and EEC's capability. 1.7 ratio roller rockers, aftermarket intake, J302's, etc. I may look into what sort of EEC tuner software there is but I really don't want to convert to mass air due to the expense. I'm trying to keep the budget down on this one so I can pour more money into the hobby cars. It's just so tempting with all the neato keeno aftermarket stuff these days.

Mike, your probably right. A bit of weld ought to do the trick.

Thanks Guys,
Dan Jones

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