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360 heads #1155228 01/12/12 01:59 PM 01/12/12 01:59 PM
Joined: Nov 2011 Posts: 8 meadville, pa C chargerbill OP member
chargerbill OP member C Joined: Nov 2011 Posts: 8 meadville, pa	what year did they start putting harden seats in the heads for unleaded gas

Re: 360 heads [Re: chargerbill] #1155229 01/12/12 02:19 PM 01/12/12 02:19 PM
Joined: Apr 2007 Posts: 2,921 Calgary, Alberta Canada a12rag master
a12rag master Joined: Apr 2007 Posts: 2,921 Calgary, Alberta Canada	Think it was 72 or 73 ??? If not, then for sure it was 74 . . .

Re: 360 heads [Re: a12rag] #1155230 01/12/12 03:04 PM 01/12/12 03:04 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	You won't see it as they were induction hardened not inserts.

Re: 360 heads [Re: MoparforLife] #1155231 01/12/12 05:31 PM 01/12/12 05:31 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	True, my '73 400 had induction hardened seats, only could tell by the blue color on the casting after hot-tanking. R.

Re: 360 heads [Re: chargerbill] #1155232 01/14/12 12:06 PM 01/14/12 12:06 PM
Joined: Nov 2011 Posts: 8 meadville, pa C chargerbill OP member
chargerbill OP member C Joined: Nov 2011 Posts: 8 meadville, pa	thank you everyone i have a set of 73 360 heads and was just wondering so how do i know if mind are or aren't

Re: 360 heads [Re: chargerbill] #1155233 01/14/12 02:13 PM 01/14/12 02:13 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Personally I wouldn't worry about it. In our experience the Mopar heads can take more UL gas usage with no damage that either of the brand x heads. This especially so under the minimal mileage and light load usage most of these engines will be subjected too. If the valves need re-seating any way then have a set of hard seats installed on the exhaust valves.

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