Smallport block with Largeport Head

Farmor00

Farmor00

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Hey I have an APY block and recently got my hands on an NA ADR head.

Is this conversion as simple as just getting a largeport intake manifold or are other modifications required?
 
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Fairly confident the only difference is SAI port missing on the head... deleting this crap anyways, anyone else doing this make sure intake manifold is aftermarket as the A3 ones will have throttle body going the wrong way... may suggest upgrading to 80mm throttle body while youre at it.

Alternatively you could port a smallport intake to fit largeport but that seems a bit silly.
 
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Can't you get an adapter plate, large ports on these stock turbo cars apparently lose a load of torque, additionally NA cams are only a benefit of you're > 450bhp big turbo.

And you'll probably want the exhaust valve shims from your old head?
 
Stuart B said:
Can't you get an adapter plate, large ports on these stock turbo cars apparently lose a load of torque, additionally NA cams are only a benefit of you're > 450bhp big turbo.

And you'll probably want the exhaust valve shims from your old head?
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From what ive read the NA cams that are only benefit big power is the catcam/b5 spec ones. The standard is a "benefit" although probably not required by any means. Since im sorting a new head regardless i may aswell get an NA one with said cams in it. I am running an K04 AET-380 hybrid on this one.

As for the shims ive replaced all valve springs with cat cam gold ones so its not an issue in this case.

As for adapter plate probably, but fabricating that vs just porting the manifold... id just port the manifold at that point.

Ended up ordering an 034 motorsports largehead intake manifold as it was on sale.
 
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