Question for Cylinder Head gurus

LuvMopars · 10-07-2010, 03:16 PM

If you have a small block stock eliminator engine and you have a choice between two heads, one being about 5cc's larger in the intake runner than the other, but both are the same size in the pushrod pinch area, would there be much difference in the two heads as far as horsepower ?

GTX JOHN · 10-07-2010, 03:57 PM

Are you talking about 894 X and 915 J 2.02?

LuvMopars · 10-07-2010, 04:02 PM

Yes sir, thats exactly what I'm speaking of. Man, youre reading me like a book ! LOL

Bub Whitaker · 10-07-2010, 07:03 PM

more intake runner volume, more power... period

aspen7709 · 10-07-2010, 07:48 PM

That thinking might be true for brand X heads but the chryslers like velocity not so much as volume. port speed is crucial. ask GTX john. Bigger cc.s does not always mean better. I am currently working with heads that are WAY under spec and they are making alot of good power. Right John?

Bub Whitaker · 10-07-2010, 07:57 PM

If your talking Super Stock, velocity yes. Stock, no - stock intake -stock runner- more volume more power... been there

Todd Boyer · 10-07-2010, 09:40 PM

I don't have a current National Dragster, are the port volumes published anywhere else? What are the volumes for the 894 and the 915? I assume the 894 has the larger volume?

Bub Whitaker · 10-07-2010, 09:58 PM

http://www.nhra.com/userfiles/file/N...edProducts.pdf

Todd Boyer · 10-07-2010, 10:19 PM

Thanks Bub.

James L Miller · 10-08-2010, 12:07 AM

It looks like they changed the port volumes on the 894 head. They used to be smaller from what I remember. My 587 heads have better flow on the exhaust side than the 915 heads due to the bump in the floor.

10-07-2010, 03:16 PM	#1
LuvMopars Junior Member Join Date: Dec 2006 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Question for Cylinder Head gurus If you have a small block stock eliminator engine and you have a choice between two heads, one being about 5cc's larger in the intake runner than the other, but both are the same size in the pushrod pinch area, would there be much difference in the two heads as far as horsepower ?

10-07-2010, 03:57 PM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,708 Likes: 2,734 Liked 2,398 Times in 679 Posts	Re: Question for Cylinder Head gurus Are you talking about 894 X and 915 J 2.02?

10-07-2010, 04:02 PM	#3
LuvMopars Junior Member Join Date: Dec 2006 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: Question for Cylinder Head gurus Yes sir, thats exactly what I'm speaking of. Man, youre reading me like a book ! LOL

10-07-2010, 07:03 PM	#4
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Question for Cylinder Head gurus more intake runner volume, more power... period __________________ Bub Whitaker

10-07-2010, 07:48 PM	#5
aspen7709 Member Join Date: Aug 2004 Location: sunny,az Posts: 165 Likes: 0 Liked 0 Times in 0 Posts	Re: Question for Cylinder Head gurus That thinking might be true for brand X heads but the chryslers like velocity not so much as volume. port speed is crucial. ask GTX john. Bigger cc.s does not always mean better. I am currently working with heads that are WAY under spec and they are making alot of good power. Right John?

10-07-2010, 07:57 PM	#6
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Question for Cylinder Head gurus If your talking Super Stock, velocity yes. Stock, no - stock intake -stock runner- more volume more power... been there __________________ Bub Whitaker

10-07-2010, 09:40 PM	#7
Todd Boyer Senior Member Join Date: Feb 2004 Location: Saint John NB Canada Posts: 560 Likes: 27 Liked 6 Times in 5 Posts	Re: Question for Cylinder Head gurus I don't have a current National Dragster, are the port volumes published anywhere else? What are the volumes for the 894 and the 915? I assume the 894 has the larger volume?

10-07-2010, 09:58 PM	#8
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Question for Cylinder Head gurus http://www.nhra.com/userfiles/file/N...edProducts.pdf __________________ Bub Whitaker

10-07-2010, 10:19 PM	#9
Todd Boyer Senior Member Join Date: Feb 2004 Location: Saint John NB Canada Posts: 560 Likes: 27 Liked 6 Times in 5 Posts	Re: Question for Cylinder Head gurus Thanks Bub.

10-08-2010, 12:07 AM	#10
James L Miller Member Join Date: Apr 2005 Posts: 494 Likes: 6 Liked 25 Times in 16 Posts	Re: Question for Cylinder Head gurus It looks like they changed the port volumes on the 894 head. They used to be smaller from what I remember. My 587 heads have better flow on the exhaust side than the 915 heads due to the bump in the floor. __________________ Mopar 2 Ya!