need help with timing

i have an 1835 motor, big valve head, oversized cam(not sure which one, but it is slightly over stock) i am running a 40 hpmx carb, stock crank. i built the motor about 10 years ago, but it only has about 5,000 miles. it is due for a rebuild but still runs strong. it is currently in a "68" sandrail. i have the 009 distributer. it was originaly timed at sea level to tdc while running a stock 32 pct carb(the 40 hpmx was installed about a month ago) i am now at about 5,000 ft above sea level and need to re-time my engine. any suggestions? if this is not enough info let me know and i will try to give more. this is all i could think of right now. thanks

What engine you have is immaterial. VW Engine timing is set by the distributor. All it does is make sure that spark is delivered at the proper point in the engine compression cycle. Altitude does not effect timing, since it is a mechanical setting.

You should adjust your carb and/or re-jet to compensate for "lighter" air at those altitudes.

[quote=BoatCop;5939536]What engine you have is immaterial. VW Engine timing is set by the distributor. All it does is make sure that spark is delivered at the proper point in the engine compression cycle. Altitude does not effect timing, since it is a mechanical setting.

You should adjust your carb and/or re-jet to compensate for "lighter" air at those altitudes.[/quote
i pulled the main jets, the numbers were not readable, but kinda loked like 115, the hole was bigger than any of the other jets, the bigest i had was 150, i think. i was baffled about that, but have never messe with jets before. the idle jets were the biggest tat came with the carb, but i cant remember what they were off hand. the reason i am wondering about timing is i talked to a local shop, and was told the timing made a big difference with altitude? i am fammiliar with volkswagons, but have never messed with timing or jets much. any help is appreciatd,as i dont want to take it to a shop. if you need more info i will pull my jets and double check. thanks.

make sure that spark is delivered at the proper point in the engine compression cycle.go to workshop and ask them to repair it.

Here's the instructions for timing the 009. Good Luck!

http://www.runtothesun.co.uk/menus/vwtech/pages/0092004.html