915 heads ?
#83027
07/02/08 11:39 AM
07/02/08 11:39 AM
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Joined: Jan 2003
Posts: 667
CA
66Dodge
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 667
CA
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I bought a set of newly rebuilt 915 heads off eBay many years back and hadn't gotten around to them until now. I just measured the exhaust valves and found they are 1.60" !  I thought all 915's were the onetime castings used in the '67 HP 440's and had the 1.74" exhaust valves ?  I guess I'll have my machinist install the bigger valves. Despite the smaller exhaust valves that came with these heads, are the ports still the better flowing ones ? Thanks in advance.
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Re: 915 heads ?
[Re: 66Dodge]
#83031
07/02/08 01:03 PM
07/02/08 01:03 PM
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Joined: Jan 2003
Posts: 1,367
Jersey shore
Gary67
super street
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super street
Joined: Jan 2003
Posts: 1,367
Jersey shore
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Quote:
I boughThe factory stamped hp 915s had the large valves the non hp had the small same head other than that...t a set of newly rebuilt 915 heads off eBay many years back and hadn't gotten around to them until now.
I just measured the exhaust valves and found they are 1.60" !
I thought all 915's were the onetime castings used in the '67 HP 440's and had the 1.74" exhaust valves ?
I guess I'll have my machinist install the bigger valves.
Despite the smaller exhaust valves that came with these heads, are the ports still the better flowing ones ?
Thanks in advance.
The hp stamped 915 heads had the large valves no hp stamp had the small ones, same head otherwise...
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Re: 915 heads ?
[Re: Gary67]
#83032
07/02/08 01:15 PM
07/02/08 01:15 PM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
master
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master
Joined: May 2004
Posts: 4,920
Joplin, MO USA
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Really, I thought that there were three 915 heads out there if you will. The small exhaust valve and the big exhaust valve heads and then there were HP's and of course those had the big valves?
Moparlee
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Re: 915 heads ?
[Re: Robbins]
#83034
07/02/08 01:27 PM
07/02/08 01:27 PM
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Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
Really, I thought that there were three 915 heads out there if you will. The small exhaust valve and the big exhaust valve heads and then there were HP's and of course those had the big valves?
There are 3 versions on the 915 "J" heads in the smal block world.
Big intake 2.02
Small inake 1.88
And then the T/A heads with the big intakes with the off-sets pushrods.
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Re: 915 heads ?
[Re: Gary67]
#83036
07/02/08 01:36 PM
07/02/08 01:36 PM
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Joined: Feb 2003
Posts: 8,020
Pangaea
B5 Bee
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master
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Pangaea
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Quote:
Just two far as I know, it was the first bb head with the 1.74 exh valve I think also....
It was the second. The '63 383-343hp 2x4bbl motor used a 1.74 exh valve. I think the '62-'64 300 letter cars also used a 1.74 exh.
There were more 1.60 exh 915s than there were 1.74. I've had two pair over the years.
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Re: 915 heads ?
[Re: B5 Bee]
#83037
07/02/08 01:42 PM
07/02/08 01:42 PM
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Joined: Jan 2003
Posts: 1,367
Jersey shore
Gary67
super street
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super street
Joined: Jan 2003
Posts: 1,367
Jersey shore
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Quote:
Quote:
Just two far as I know, it was the first bb head with the 1.74 exh valve I think also....
It was the second. The '63 383-343hp 2x4bbl motor used a 1.74 exh valve. I think the '62-'64 300 letter cars also used a 1.74 exh.
There were more 1.60 exh 915s than there were 1.74. I've had two pair over the years.
Interesting, I think some leftover small valve BB 915s made it to some 68 models..Think the smallblock 915 was 69/70 or around there...
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Re: 915 heads ?
[Re: Gary67]
#83039
07/02/08 03:03 PM
07/02/08 03:03 PM
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Joined: Jan 2003
Posts: 667
CA
66Dodge
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 667
CA
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Quote:
Quote:
I boughThe factory stamped hp 915s had the large valves the non hp had the small same head other than that...t a set of newly rebuilt 915 heads off eBay many years back and hadn't gotten around to them until now.
I just measured the exhaust valves and found they are 1.60" !
I thought all 915's were the onetime castings used in the '67 HP 440's and had the 1.74" exhaust valves ?
I guess I'll have my machinist install the bigger valves.
Despite the smaller exhaust valves that came with these heads, are the ports still the better flowing ones ?
Thanks in advance.
The hp stamped 915 heads had the large valves no hp stamp had the small ones, same head otherwise...
All these mopar books and magazines refer to the 915 heads as the high performance head back in in 1967. Of course this leads one to believe there was only one variant with the larger exh. valve.
No one ever mentioned there were 915 heads with the 1.60" valve. These were probably used in land barges with 440 low performance engines.
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