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Looking for 346 engine head bolts

Started by 47bigcadillac, September 10, 2014, 10:37:36 PM

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47bigcadillac

R. Brandys

1932 355B  5 pass Coupe,  Fleetwood          
1935 LaSalle Coupe  5077
1947 Club Coupe      6207

Tom Beaver

 The original bolts are 7/16-14 x 2-3/8 with an 11/16 head they are non-standard and not made any more except by special order.  The closest Standard Grade 8 bolts are 7/16-14 x 2-1/2 with an 5/8 head.  If you use the standard bolts it's probably a good idea to use a flat washer under the bolt head because of the slightly smaller head and the rather generous bolt hole sizes Cadillac used for the heads.  However, you need to be careful what type of flat washer you use.  APR makes special hardened flat washers for head bolts, they have  a chamfer on the upper ID in order to clear the radius where the bolt shank transitions to the bolt head.  They make ones with a 7/16 ID, 3/4 OD and come in three different thicknesses.  Also, note that the bolts under the water outlet spouts are a different length and head size from the rest of the head bolts.

Tom Beaver

TMoore - NTCLC

Terrill Machine in DeLeon, TX used to provide these - always worth checking to see if they still have them - best to call since they are not totally web enabled:

Terrill Machine, Inc.
Engine Parts For Antique Cars
100 County Road 454
De Leon, Texas 76444
Phone: (254) 893-2610
Fax: (254) 893-4841
E-mail: terrillmachine@yahoo.com

Hours: Weekdays 8 a.m. - 5 p.m.

Terrill Machine, Inc. was founded in 1978 by Feltz Terrill, Sr. The day to day operation is now run by his son, Feltz Terrill Jr. Terrill Machine has four full-time employees who specialize in engine parts for cars age mid-30’s to mid-60’s. Terrill Machine will gladly ship your parts anywhere the in the world. They take all major credit cards.

47bigcadillac

thanks a lot for the replies

I called Terrill but they don't have those anymore
R. Brandys

1932 355B  5 pass Coupe,  Fleetwood          
1935 LaSalle Coupe  5077
1947 Club Coupe      6207

Martin Michaels

Try Alcads they say they have everything thing for 346 flatheads
Marty  CLC#26833
1947 6269  Cavern Green
1980 CDV D Elegance  White