Yes....but mostly due to the fact he is running a hyd roller which I suspect wont be very aggressive in lift.....not nearly enough to take advantage of the larger gains in airflow the 225's offer over the 205's at the higher lift points.xr4x4ti wrote:Doesn't AFR recommend 4.125 bore for the 220 head since it has a pretty large valve that is at the stock location? (Unlike say a Highport or Z-head that moves the valves over to unshroud them on a smaller bore).
Would the 205 head be a better choice for a 87 octane pump gas?
Running the smaller 205's will help port velocity and promote better part throttle response and tip in and a more crisp feel to the throttle helping to offset the lower static compression 87 octane will require.
My guess is with all the "talk of torque"....LOL, this is probably what the customer/end user is after.
There wont be much of a penalty in peak power comparing the 225 vs the 205 but the 205 will build more bottom and give the engine a more lively feel (better for a street effort than a strip effort).
If this were an SR build with better octane and more RPM (and most importantly a lot more cam lift to better utilize the higher lift flow advantage), the 225's would get the nod but I don't see that being the case here
Havent posted much on this board lately due to all the time Im having to invest getting Mamo Motorsports off the ground but I was linked to this thread by a certain member here and thought I would drop in and say hello and share my two cents on the subject.
David and I have spoken many times of course.....and Dave....if its not too late getting with AFR, consider the smaller head for this project. The smaller head might meet your performance objectives just fine and add a liveliness to the engine both you and the customer would enjoy!
Merry Xmas and Happy New Year everyone!
Regards,
Tony
PS....Im still going strong so if any of you need help regarding a project check out my website where you can access all my contact info at http://www.mamomotorsports.com
Its still work in progress and I need to update it badly but there is some cool stuff to look at and all my contact info is there