BBC alum head recomendations

[1969l78]

I have dart heads on my 725 hp pump gas street car and drive it everywhere.

[Alss]

After much debate......AFR 305's..CNC ported

[VintageMusclecar]

Excellent choice.

[1969l78]

Check these guy's they hand port & polish there heads. Did my car and can't beat stuff done by hand.

http://www.rollingthunderz.com/super...er-heads.shtml

[SuperNovaSS]

Why do you say you can't beat stuff done by hand? AFRs are awesome. A buddy and I went to their shop years ago to pick up a set of heads he ordered for a Mustang. I asked for a tour. I was very impressed.

Jason

[1969l78]

Just an opinion.

Look on the link and read the part about the diffrence in CNC porting vs. hand porting. just an opinion and it makes alot of sense. Better flow on hand ported and more accurate when done by hand

[RichSchmidt]

Hand porting is only as accurate when you measure every part of each port as you port them and get repeatable results based on a known head design.I dont care what anybody says,I have bee hand porting heads in my garage for years,and if you take a set of really well designed heads and plot them out on a computer and have a CNC machine duplicate what you enter,you will be hard pressed to get the same results with any level of repeatabitly working by hand.Hand finishing the CNC work is criical,but once you have a port design that works,I think the CNC machine is the best way to dulicate it.If you have a big shop and want t know how a head is going to respon to moving the port a set amount,it is much easier to do it by changing the design in the CNC program then tryng to guesstimate it by hand.

What I do today could best be descibed as hand finishing heads.Bowl blending,or widening the short turn,but a good set of CNC heads from a knowlagable maufacturer like AFR is leaps and bounds ahead of what most hand porters can do.Add hand finshing to the CNC head and you wont touch it by hand especially for the price

[1969l78]

Like I said just my opinion, I have seen alot of work from that shop on same bad azz street cars 900 hp running on pump gas with there heads. I will take the hand job

[EZ Nova]

I can tell you the stuff that come out of "Thunderz" is just that, IT THUNDERZ! The things will work.

As far as CNC stuff, yes it works on some "generic" stuff, but it's not all that it's cracked up to be. I've been CNC stuff for 20+ years now.

Now as far as heads for this 496, I would look at RHS 320's or Race Flow Development Victor "small bore" Eddy's. I can tell you this, I would NEVER put the 305's on MY 498 as the things would stop at like 5000 RPM!