Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Monty Takes A Deep Breath

The A.L Developments hand ported big valve head has arrived



A 0.18mm skim ups the compressio ratio a touch too



Inlet valves are now very high-spec austenitic stainless steel +1mm @ 36mm from Race Engine Components - REC 835



Exhaust valves are the same austenitic stainless steel +1mm @ 31mm (poor photo angle) - REC 836





Inlet ports recieved a lot of attention, clever bowl work and nicely knife edged port dividers.



While also heavily worked like the inlet ports, the exhaust port diameter was actually kept to 38mm, bigger is not always better. My header IDs are 44mm making them 41.6mm ID, so sticking to a 38mm exhaust port diameter gives a perfect anti-reversion step and keeps exhaust gas velocity high, both stratergies should improve torque over just blindly hogging out the port.





The new head will receive a pair of Newman Phase 3 cams to replace my current Phase 2s, my existing 180lb beehive valve springs will be moved from Monty's current head to the new big valve ported head.

Monty previously recorded 173hp before I advanced his ignition timing by 3 degrees at the top end, I've also let my pops & bangs map blast out any remaining sports cat and silencer baffles for a nice reduction in back pressure, so he should be laying down a stout 180hp now.

Place your bets on what Monty will make with the new head and Phase 3 cams?