Thanks Colin (and Roy)
I guessed that it might have been Roy's work due to the mention of a Piper cam.
It is about time that I got started on the murena rebuild. The engine had been rebuilt by Sportscast Unlimited to their Prep 142 spec but I have never heard it run. Various reports on how good their work was but at least it has a new head.
If you haven't ever run the engine since it was rebuilt and that was some time ago, then the very first thing you must do is to re-torque the head bolts. The head will have settled from the original build and I would suspect it will now be less than the original torque. The last thing you want to do is fire it up and start a head gasket failure.
When you do up the bolts, please email me and let me know how much they rotated to get back to the torque setting. When you run-in an engine straight after the rebuild, then when you re-torque the head after say 800 kms or a few weeks, they will usually rotate about another half a turn to get the torque back to the correct level. Since your engine has not run but has had a lot of time to settle, I will be interested to know how that compares. Thanks.
I also have the single Weber advised by Roy as a better alternative to the Dellorto set up.
If you have a Holbay cam profile or a similar fast road profile, then yes the single down-draught carburettor will still produce the power with better economy.
Hope to be down a the NEC Classic Cars show on the Sunday for a bit of inspiration.
Have a good visit.
Roy
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