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  turning 8bolt 360 heads into 14bolt 390 heads (exhaust)

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Author Topic:   turning 8bolt 360 heads into 14bolt 390 heads (exhaust)
Fastback Nation

Posts: 124
From: San Diego, CA USA
Registered: Aug 2004

posted 10-06-2004 10:51 AM     Click Here to See the Profile for Fastback Nation   Click Here to Email Fastback Nation     Edit/Delete Message   Reply w/Quote
I just posted this in the mustang forum, but thought you guys might now too. Can't get too much input!
Into my late 360 heads, I'm drilling the extra exhaust manifold holes that the mustang 390 heads came with. The 360 heads have the standard over/under 8 holes on the exhaust, but I need the 14 bolt pattern 'cause I'm putting this into my 67 s-code (390FE) mustang. My 360 heads do have the extra bosses cast into them to accept the new holes. I just got the headers last night, so I'm going to transfer the hole pattern from the gasket to the head (and drill them out using a bucks drill (electromagnetic base drillpress) so I won't have to remove the heads; motor is out of the car).
Problem is, 428CJ and SCJs had a 16bolt pattern, and that's what the gasket has.

Which two holes do I leave out? I could drill the extra two anyway, but I figure 4 less holes to drill is less work for me!
Thanks, Joel.

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Posts: 834
From: Rockville, MD
Registered: Oct 2002

posted 10-06-2004 01:28 PM     Click Here to See the Profile for KULTULZ   Click Here to Email KULTULZ     Edit/Delete Message   Reply w/Quote
On the 428CJ cast iron exhaust manifold, No. 8 cyl. used the existing (old pattern, i.e. straight up and straight down) pattern as I assume it was fairly easy to get one's hand into that position.

Is this what you are asking? Just make sure you can get your hand down there with tubing headers. You might need the two additional holes...

I am looking for information concerning factory performance/aftermarket speed parts (1958/1960) used on the MEL (Mercury-Edsel-Lincoln) (Also Thunderbird 59/60) Engine Series (383-410-430-462) produced from 1958 thru 1968.

Also older FORD Special Service Tools

-MEL Engine Forum-

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