Phil99vette

iTrader: (11)

I am debating another H & C combo for my C5. I have been kicking around the idea of going to a set of the AFRs but I am really torn between the 205s and 225s. The combo would be for setup for drag racing. Anyone care to dicuss this topic?
Current Combo
5.3 truck heads flow 315 @ .600
232/238 XER cam
12.25:1 CR

Setup: 1
205s or 225s
12.0:1 or higher compression
240+ Cam

Setup 2:
TEA Raised Runner heads
12.0:1+ CR
240+ Cam

Phillip

11 Bravo

iTrader: (3)

The 225's aren't even out yet so no one knows. They are supposed to be set up for larger bores, though.

kumar75150

I'm not sure how a 2.08 intake valve will work with a stock bore motor. The 225s will kill the 205s in flow though.

Tony Mamo @ AFR

iTrader: (13)

Phil...
225's all the way....I am DESIGNING them with a "max effort" 346 in mind....as well as of course larger displacement shortblocks as well.

Also, forget everything you have heard about 2.08 valves and stock bore sizing....at least as far as the AFR heads are concerned.

I have spent quite a bit of time trying to optimize both (2.055 vs. 2.080), and the bottom line is I have been able to extract better numbers overall from the larger diameter valve (much to my surprise as well considering the distance to the chamber wall). This is NOT a factory casting and with the valvejob I have carefully chosen, different chamber design (even different than our own 205), as well as working with larger runner design parameters with different contours, the 225 just kicks butt....even on the small bore diameter.

I have been doing ALL of my design work utilizing both large and small bores to make sure any changes I was evaluating responded favorably on both big and small (stock) bore engines. This certainly added quite a bit of time to the development of the product, but I felt it was necessary to test on both as I wanted the 225 to also be very effective on a stock displacement shortblock as well.

I will be posting a thread shortly to discuss which applications I believe are better suited to 225's vs 205's and visa-versa, benefits of both, and anything else I can think of covering both products....It's obviously a question that comes up very often....I will try and address all of the issues to consider to help you guys make the right choice.

Phil, your case is cut and dry....a pair of 225's..... but other peoples choices are not so clear.

Keep an eye out for that thread....


Regards to all,
Tony M.

Phil99vette

iTrader: (11)

Tony,
Can you give me an idea of flow #s?
Phillip

offaxis

iTrader: (19)

Great post Tony

I have been sitting on the fence waiting to see how the 225`s will work on the 346 engines before ordering a set. Please keep us up to date on any testing done with the 225`s.

Thanks

BuckeyeROC

iTrader: (7)

Awesome Tony, I'm waiting for your 225's. Should make some CRAZY power w/ a 240+ cam

Bink

Shouldn't the 3 valve Z06 heads be out in 13-14 months. I'm waiting.