1967 plymouth gtx 440 cylinder heads.

melvin wellman · 08-23-2023, 12:44 PM

Just curious. With all the heads listed that would need modifications in order to be used, except the 915, I don't understand why the 516 head should not be listed, with the only modification of using the correct 1.74 exhaust valve in place of the 1.60 valve it comes with. I'm sure I'm missing something. But it don't make sense to me.

Paul Precht · 08-23-2023, 02:07 PM

The 915 head is far better for stock, the 516 is an earlier head. A superseding head is typically if not always a newer head.

melvin wellman · 08-23-2023, 10:56 PM

Thanks, it was just a little confusing to me.

GTX JOHN · 08-26-2023, 02:02 AM

The 915 flows way better in our experience!
You could spend thousands on the 516 and it would
not be any better than a virgin 915.

melvin wellman · 08-26-2023, 10:47 AM

Thanks guy's, I didn't know any better. Thought the valve size was the only difference.

GTX JOHN · 08-26-2023, 02:13 PM

The 67 GTX 440 is a pretty good combo especially.
with the 49 state 750 Carb.

melvin wellman · 08-27-2023, 11:48 PM

I thought it might be worth a try. Was planning on using the edelbrock 1407 and it will be a stick shift car.

08-23-2023, 12:44 PM	#1
melvin wellman Junior Member Join Date: Jan 2015 Location: boulder, mt Posts: 14 Likes: 0 Liked 2 Times in 2 Posts	1967 plymouth gtx 440 cylinder heads. Just curious. With all the heads listed that would need modifications in order to be used, except the 915, I don't understand why the 516 head should not be listed, with the only modification of using the correct 1.74 exhaust valve in place of the 1.60 valve it comes with. I'm sure I'm missing something. But it don't make sense to me.

08-23-2023, 02:07 PM	#2
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 696 Likes: 284 Liked 242 Times in 94 Posts	Re: 1967 plymouth gtx 440 cylinder heads. The 915 head is far better for stock, the 516 is an earlier head. A superseding head is typically if not always a newer head.

08-23-2023, 10:56 PM	#3
melvin wellman Junior Member Join Date: Jan 2015 Location: boulder, mt Posts: 14 Likes: 0 Liked 2 Times in 2 Posts	Re: 1967 plymouth gtx 440 cylinder heads. Thanks, it was just a little confusing to me.

08-26-2023, 02:02 AM	#4
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,545 Likes: 2,239 Liked 1,884 Times in 580 Posts	Re: 1967 plymouth gtx 440 cylinder heads. The 915 flows way better in our experience! You could spend thousands on the 516 and it would not be any better than a virgin 915. __________________ John Irving 741 Stock 741 Super Stock

08-26-2023, 10:47 AM	#5
melvin wellman Junior Member Join Date: Jan 2015 Location: boulder, mt Posts: 14 Likes: 0 Liked 2 Times in 2 Posts	Re: 1967 plymouth gtx 440 cylinder heads. Thanks guy's, I didn't know any better. Thought the valve size was the only difference.

08-26-2023, 02:13 PM	#6
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,545 Likes: 2,239 Liked 1,884 Times in 580 Posts	Re: 1967 plymouth gtx 440 cylinder heads. The 67 GTX 440 is a pretty good combo especially. with the 49 state 750 Carb. __________________ John Irving 741 Stock 741 Super Stock

08-27-2023, 11:48 PM	#7
melvin wellman Junior Member Join Date: Jan 2015 Location: boulder, mt Posts: 14 Likes: 0 Liked 2 Times in 2 Posts	Re: 1967 plymouth gtx 440 cylinder heads. I thought it might be worth a try. Was planning on using the edelbrock 1407 and it will be a stick shift car.