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Author Topic:   alum heads and ford blocks
stroker man
Gearhead

Posts: 113
From: Denville NJ USA
Registered: Mar 2002

posted 01-23-2003 07:35 PM     Click Here to See the Profile for stroker man   Click Here to Email stroker man     Edit/Delete Message   Reply w/Quote
I dont know if its true but alum heads on stock ford blocks arent to good because they dont have enough head bolts, only eight on windsors, just seeing if anybody has to retorque them often. dont cheevys have like 15 bolts?

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steve'66
Gearhead

Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000

posted 01-23-2003 07:43 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
You've been peeking into Chebbie site haven't you. LOL

Ford windsors have 10 big 1/2" diameter bolts, plenty to hold the aluminum or iron heads down. Once you get over 800 h.p. you might have a problem, but I don't think that's really a problem for most of us.

SteveW

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RADRIDE
Gearhead

Posts: 240
From: Va.Beach, Va.
Registered: Aug 2002

posted 01-23-2003 07:43 PM     Click Here to See the Profile for RADRIDE   Click Here to Email RADRIDE     Edit/Delete Message   Reply w/Quote
Have the AFR alum on mine and after warm up and cool down tried re-torque as suggested by AFR I didnt loose anything it clicked right on the numbers.

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RADRIDE
Gearhead

Posts: 240
From: Va.Beach, Va.
Registered: Aug 2002

posted 01-23-2003 07:47 PM     Click Here to See the Profile for RADRIDE   Click Here to Email RADRIDE     Edit/Delete Message   Reply w/Quote
I guess I should have mentioned AFR gives a different torque pattern than normal with the top bolts getting 10 xtra lbs.I also have studs holding them down.

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V8 Thumper
Gearhead

Posts: 3467
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 01-23-2003 07:57 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
The longer bolts do get more load; longer fasteners absorb more torsional force. I run aluminum heads on a 7000 rpm 10:1 Windsor without any head gasket problems. I do however use the highest quality head gaskets. Don't believe everything you hear.

Ask a machinist how bad a chebbie block contorts under the load of 32 head bolts

...or how bad the block bananas when the bellhousing is torqued on

------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html

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n2oMike
Gearhead

Posts: 1547
From: Spencer, WV
Registered: Jan 2001

posted 01-23-2003 10:13 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by steve'66:
Ford windsors have 10 big 1/2" diameter bolts,

Small block ch*vys use seventeen 7/16" bolts. 351W's have ten 1/2" head bolts. 460's use ten HUGE 9/16" bolts. However 289/302's use ten smaller 7/16" bolts, and are borderline for performance use. If nitrous is planned, get the best bolts/studs available, and keep the timing in check, and burn the best fuel available. Either that, or convert to 1/2" 351W bolts like I did.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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