heres the short story: 1969 beetle, stock tranny, 205/60/15 on the rear, stock clutch, 1641 engine, scat crank, balanced, engel 110, straight cut gears, full flow filter with berg pump cover, lightened flywheel, santana power pulley and a pair o' kadrons.
this summer i swapped out the stock heads for a pair of stock heads that were ported and polished and flycut .040". i was also able to bump up the dist. timing 2 degrees to 7 btdc.
the car runs WAY better since the new heads. revs to 5500 before dying off and has way more torque and no more flatspots.
i took it to osoyoos yesterday and the car no longer runs out of steam when i grab 3rd gear. the kicker is that all that the new heads improved was about .100 seconds and 2 mph faster. 10.7 at 63 mph
what gives? have i just reached the limit with this motor?