Greg, early engines had a 1 barrel carb with #3 cam.
This cam is great for top end power, but lacks in the low and mid-range rpms.
Going to the #5 cam you improve the power curve from idle to full out and with the forged pistons, the engine can operate well past the factory 4500rpm redline
To make up for the extra few cc's , slightly higher compression pistons and decked heads, the carb has also been modded internally.
Venturies are upsized from 32-22 sleeves to 32-24mm sleeves to increase airflow , carbs are also re-jetted .
End result is at least 8-10hp gain.
The final results will be gauged by the size of Ricks smile after his test drive
now back to the albatross..................................................
