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1; Testing is done using a built long block. Is there any reason why this head package cannot be used on a stock block.
There is no reason why you cannot use it on a stock motor. Stock rods are a hit or miss. It would be crappy to have an oem rod let go and destroy everything up top.
2: Does the increase in lift/duration make the motor an interference motor? (I'm not actually sure if stock fa20 is already an interference motor)
Stock pistons could have interference issues but we have not yet confirmed this. It will clear every aftermarket pistons out there. (Builder should always check)
We advise all customers to let us clearance and shim everything for them. These heads can be tricky to get right.
3: Will the sale of this product be offered on a core exhange basis, to minimise down time?
Yes, cores are already in the works. We have been selling this head package without cams for awhile.
4: Is all varible valve timing and such retained with this package, so that low rpm drivability and economy is minimally effect?
Yes it is
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