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tanart		#1 Posted : Thursday, 14 December 2006 9:19:49 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 9/11/2005(UTC) Posts: 268		i have a set of chev heads and need to know what they're off. The part number on them is 3917291. They have the double humps on the front of the head. Thanks
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Sandman		#2 Posted : Thursday, 14 December 2006 11:15:46 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 5/07/2005(UTC) Posts: 349		Whats the casting number under the intake runner? Should be 3 numbers. Sound like old double hump Fuellies. Usually 1.94 & 1.5"valves, 64cc chamber, pressed in rocker studs. No accessory holes tapped in the front of the heads? Edited by user Thursday, 14 December 2006 11:19:09 PM(UTC)  | Reason: Not specified
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HK1837		#3 Posted : Friday, 15 December 2006 9:09:18 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 556 time(s) in 531 post(s)		64cc chambers, off: '67-'69 302ci, 290hp, 2.02/1.6 valves. '67-'69 327ci, 250hp, 275hp, 300hp, 1.94/1.5. '67-'69 350ci, 325hp, 350hp, 2.02/1.6. '67-'70 350ci, 295hp, 1.94/1.5. _______________________________________________________ If we a
		_______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
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tanart		#4 Posted : Friday, 15 December 2006 10:03:20 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 9/11/2005(UTC) Posts: 268		were these ever used on the HK327?
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HK1837		#5 Posted : Sunday, 17 December 2006 7:04:09 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 556 time(s) in 531 post(s)		No. But there is some confusion around HK type 2 heads. The blue parts manual lists part number 3958602 for the type 2 327. It is a 64cc, 1.94/1.5" valve fuel injection head for 1961-70 as fitted to higher performance engines. I think this was also the HT
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ozchevy		#6 Posted : Sunday, 17 December 2006 9:26:55 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 12/10/2005(UTC) Posts: 495		Byron, I don't have any info on these 3958602 heads, and they are not listed in Sallee Chevrolet head lists either. 1968-69 (3917291) 350cu" 1.94 inlet 1.5 exhaust 1968-69 (3917290) 307,327cu" 1.72 inlet 1.5 exhaust 1969 (3927188) 307cu"
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HK1837		#7 Posted : Monday, 18 December 2006 9:43:25 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 556 time(s) in 531 post(s)		I made a mistake above. Part number 3958603 is the 64cc HT head, not 3958602. 3958602 is the GM part number, not casting number. GMH also listed part number 3958603 for the type 1 HK 327 in the revised HK parts manual. Part number 3958602 is simply a sma
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tanart		#8 Posted : Monday, 18 December 2006 11:39:05 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 9/11/2005(UTC) Posts: 268		The chev heads cast number 3917291 have double humps.
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HK1837		#9 Posted : Tuesday, 19 December 2006 3:30:38 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 556 time(s) in 531 post(s)		Do they have accessory holes in the ends? _______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
		_______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
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ozchevy		#10 Posted : Tuesday, 19 December 2006 6:47:18 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 12/10/2005(UTC) Posts: 495		3917291 are Double Hump heads, and no accessory holes are drilled as standard heads. 3927186 is as Byron say's also a Double Hump head, but these were called a Bowtie Head in the U.S
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tanart		#11 Posted : Tuesday, 19 December 2006 7:10:17 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 9/11/2005(UTC) Posts: 268		No accessory holes as ozchevy mentioned.
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HK1837		#12 Posted : Tuesday, 19 December 2006 7:29:06 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 556 time(s) in 531 post(s)		I think that the 3917291 heads may have been the ones Des West got caught with. I remember hearing or reading somewhere that it was the casting marks and not the accessory holes that scutineers spotted. May be wrong though. ____________________________
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