They weren't finished at that point, and a load of other machining and port finishing followed. This was the raw ports cut to size, seat inserts in and multi angle seats finished.
There's some good engine projects in the club at the moment, so should be interesting testing later in the year.
Tony's and Lee's have some common lineage from my original build and flow tested but with different choices. Tony and John's (self mod post valve seat and throat cutting) has port mods based on OE sized valves: selected inlet penny on a stick (nail) design.
And just back-cut exhaust valves. Saves a substancial amount of cost on replacing all the exhaust valves and seat inserts, with the compromise of reduced flow potential. Port work from my photos etc has been done very nicely by John and expect some good results.
Tony is going equal length exh fabricated header and HTT GT series roller bearing turbo.
Has the same cam as my original build, and very much think he'll want more
Both engines have the compression reduced, similar head cc (Lee's does have lower CR) and piston mod. Both have the same inlet valve OE diameter on 30 deg seat. Bottom ends all OE, and for this state of tune more than adequate.
Lee's has all of the above ++ i.e. larger exhaust valve, twin interference valve springs to accomodate increased cam lift (std 7mm, Tony's 8mm, Lee's 10mm),
Revised and flow tested inlet and exhaust port mods, and special experimental grind cam.
Mods have been done in line with keeping Z7U theme, so std headers (and std turbo fitment hardware) are being pushed hard, and reversed to squeeze every last ounce of non-turbulent flow from them.
There are a number of other mods, but depending final turbo choice, and of course if it stays togther (cam and followers mostly), this package will easily exceed 300hp at the flywheel and support up to about 350hp. Possibly more in twin-turbo
arrangement which is the likely next stage.
The power is in the head and ring package for this engine, and as such there is much development that can be done. I'm currently working on what I should have done for Lee's
at the time if I had the valves available at the time, and that's a larger inlet on a 45 deg seat.
So will be working on that and likely shoot Lee's way for in car testing at the end of the year.
I've got a few heads lying around for me to have a go at at a later date .
