which one has the highest flow potentil? non vtec. right now i am useing a ported d16a6 head and block, but, am not happy with the ports and am looking for a diffrent head.

 

your best bet would be to ask Bisi as he has had the most experience with these.

 

actualy im looking at around 400 at the wheels now with my build. the block has a guard done the right way, welded into it the decked and honed and am looking to make the most i can out of it without going to a sleave. maybee on the next motor i will sleave.

 

currently useing a stock bore a6 block, stock crank, tunner toys rods, vitara pistons, z6 metal head gasket, a6 head, and in talks with delta about my cam.

 

400s is going to be easy with the A6 head. We did a fully built head and using our SR909 camshaft on a built unsleeved block. The customer did 385 on 17lbs of boost. Had alot more to it and I dont believe they were taking it up that high yet. I think at most 7800, but you can make power into 8500rpm and more easily with a good cam.

 

Hey why not make more power on less boost? I say get in touch with Bisi and let him set you up with a good head. Best of luck!

 

The a6 ports can go pretty big. I ported this one out a bit too much lol



I never ran this head, I just wanted to see how big I could go

 

D's

 

what size valves?

 

a6 head all the way bro

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aimmotorsports &raquo;</TD></TR><TR><TD CLASS="quote">what size valves?</TD></TR></TABLE>
That's the only draw back to the a6 head. It has one millemeter smaller intake and exhaust valves than the z6/y7/y8 heads. You could always go 1mm oversized.

Another issues is the thin gasket surface once the intake ports are opened to the max. But on the y7 head there is more material on the gasket surface so this would not be problem with this head. Plus the y7 already has the larger valves stock.

The only down side to the y7 head is the lack of really big cams available. No one makes a billet cam for a y7 so the only thing available is regrinds. I personally run the Delta 272 cam in my y7 head and really like it. Unfortunately the most lift they could regrind is... intake- .394" lift, 216* duration...exhaust- .370" lift, 210* duration at .050" lift.

There are some billet a6 cams still floating around but are no longer in production. My 2 cents

 

thanks. i did not know that about the valves. i have a y7 head also. its been sitting for a few years on a shelf from when i did a mini-me with a y8 head on a friends hatch. may just put my head together and put it on ebay or something. what spring/ retainers are there for the a6? y7? i have been only able to find the valves for the a6...

 

If left in factory form, I love the Z6 head. If porting is an option, the A6 is my weapon of choice. Hardwelding is another viable option for camshafts, as we have had great success doing this on NSX, Accord, and non-vtec D engines for over a decade.

Our level 1.2 cam is also tailored towards boosted applications, as it is similar to our level one, but with more lift and duration on the exhaust, and a wider lobe separation to allow you to build boost sooner, and retain it longer. Numerous customers have reported ove a 60hp increase, at low boost levels, over a n/a grind, that was not purpose-built.

Aim, I also have springs for your application, and retainers too! I hope that helps.

 

Bisi, you're the brickhouse of single cams.

 

Listen to what Bisi and rota92 have to say.

rota's Z6 was the highest HP one to date.

 

what rpm can the stock a6 springs and retainers handle safely? yours? my a6 stuff is still in good shape, just from talking about my cam i think i might be over reving the stock stuff...