need an assembled head
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Not "free" but a 25 HP average increase across the entire operating range for a few hundred extra is the cheapest power you will buy, especially if it is cammed to take advantage of their capabilities. This is power that does not cost streetability.
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
As far as intake I have a jegs Dual plane vortec intake , it clears all holley and my new fast efi on the 80 i own.
Anyone seen the ZZ465 ... 350ci .. 465 horse .. 650 holley rpm air gap .. 575/595 cam .. Now come on ya have to admit that is un-herd of power off a 350 ci motor .. And it uses the fast burn head and is sold as a full dress motor ..
Best part of all is to get 600-650 lift on the fast burns cost 199.00 for the nitrated PAC beehive springs no machine work needed
Anyone seen the ZZ465 ... 350ci .. 465 horse .. 650 holley rpm air gap .. 575/595 cam .. Now come on ya have to admit that is un-herd of power off a 350 ci motor .. And it uses the fast burn head and is sold as a full dress motor ..
Best part of all is to get 600-650 lift on the fast burns cost 199.00 for the nitrated PAC beehive springs no machine work needed
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I had a roller cam like the XR282hr only the solid roller version. I moved up to a something like a XR286HR to cure the detonation problem with my 64 cc heads. I actually just put my smallest heads on that 383 AFR 210's
Last edited by gkull; Feb 2, 2014 at 12:18 AM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
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Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
This is where AFR excels. Their 180 eliminator flows more than most 200+ cc Heads on the market. Port velocity helps bottom end torque. I/E ratio is another strong point as well as lightweight valvetrain components. If budget is not the primary driver buy AFR. If budget has no bearing at all buy the AFR Competition ported 195 eliminators for about $2000. They flow 300CFM and are capable of close to 600 HP with a 195 port. If budget is the primary driver look at the Straub heads. They seem to be the best bang for the buck in a budget aluminum head.If you look at some forms of racing, mainley professional ranks, they don't care about exhaust flow numbers. They know they can cam it to make the power.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
A little info on I/E ratio. Don't let it enter in to the equation. It's like rod ratio, it is what it ends up being. If 2 heads are equal int intake flow but one has less exhaust flow that just means it will have an exhaust lobe that holds the valve open longer.
If you look at some forms of racing, mainley professional ranks, they don't care about exhaust flow numbers. They know they can cam it to make the power.
If you look at some forms of racing, mainley professional ranks, they don't care about exhaust flow numbers. They know they can cam it to make the power.
Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
I understand that but better exhaust flow on the head allows you to use a shorter duration on the exhaust, reducing overlap and reversion, improving street manners, vacuum, off idle throttle response and idle quality all pluses in a street engine specifically with less than optimal gearing and street exhaust. Makes more difference in a typical street application vs all out high RPM launch, WOT to redline seen in drag racing or the upper midrange to redline narrow powerband seen in road courses and circle track. I have a similar opinion on LSA. In many street applications I would give up peak power numbers for increased width in the powerband, flatter, less peaky torque curve, street manners, idle quality, vacuum and MPG. JMHO.
If you put the event's where they need to be then you can end up with decent idle and vacuum.