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  Mustangsandmore Forum Archive
  '79 to '93 -- The Fox Mustang
  J302 Cylinder Heads

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Author Topic:   J302 Cylinder Heads
oddrodtodd
Journeyman

Posts: 29
From: Belgrade, MT, 59714, USA
Registered: Aug 2004

posted 01-08-2005 07:16 PM     Click Here to See the Profile for oddrodtodd        Reply w/Quote
I just watched a pair of Ford Performance (Ford Motorsport) cylinder heads part #J302 sell on E-Bay for around $460.00. I was just wondering if anyone has compiled a useful database on all the different Motorsport cylinder heads that have been sold through the years. I couldn't find any information on these and didn't bid because I didn't know what their design characteristics were.
I guess they had raised exhaust ports but I couldn't find any info on their runner size, chamber size etc. There wasn't enough time left in the auction to get a response from the seller, and they appear to have been a steal.
In the future I'd like to be able to make an educated decision before I fork up the $$$'s for what could end up being a very expensive door stop!
Thanks, Todd

------------------
Todd & Judy Noel
'74 Pinto-302
'86 Mustang GT 5.0
'76 F250-460 Trailering Special

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 01-09-2005 11:53 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
Todd, there are just too many to list specifically.

FoMoCo makes revisions and changes so often, that even a head with the same casting number will have an early or late version.
Best to post here when you are interested and we will try to help.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

Daniel Jones
Gearhead

Posts: 972
From: St. Louis, MO
Registered: Aug 99

posted 01-09-2005 07:42 PM     Click Here to See the Profile for Daniel Jones        Reply w/Quote
> I couldn't find any information on these and didn't bid because I didn't know
> what their design characteristics were.

J302 was the part number that Ford assigned to "AR" heads manufactured
by Alan Root. They were developed for Root by Ken Duttweiler and were
the first of the modern Windsor-based aftermarket aluminum heads. They
were quite expensive when first introduced because they had no competition.
I had a set many moon ago. The chambers were 58 cc's and they nominally
used 1.94"/1.6" Chevy valves. The assembled SVO J302's came with 2.02"
intakes. There was 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 (some of the studs go into the water jacket) and guide
plates. Solid bronze guides, grooved for oil seal retention. The intake
ports measured 1 1/4" wide by 2 1/16" tall. The exhaust ports measure
1 7/16" wide by 1 5/16 tall and proved too wide for my Motorsport 1 5/8"
stainless steel shorty headers. Ford and other manufacturers had specific
headers for the J302's. 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. 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".

> I guess they had raised exhaust ports but I couldn't find any info on their
> runner size, chamber size etc.

I don't recall the exhaust ports being raised.

> FoMoCo makes revisions and changes so often, that even a head with the same
> casting number will have an early or late version. Best to post here when
> you are interested and we will try to help.

Listen to the man. I just love it when Ford markets three completely different
intake manifolds with the same part number.

Dan Jones

oddrodtodd
Journeyman

Posts: 29
From: Belgrade, MT, 59714, USA
Registered: Aug 2004

posted 01-10-2005 02:01 AM     Click Here to See the Profile for oddrodtodd        Reply w/Quote
Thanks guys for your help. Even though they might have been older it sounds like the heads might have been good for the fairly mild street engine I was considering.

Todd

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 01-10-2005 11:08 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
They were (are) pretty good heads.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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