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48 Posts
Maybe I made a mistake asking Comp Cams about my advanced timing.
I told them about my power brake (hard pedal) I have a stock 302
2 bbl carb/Automatic Transmission that only had 13½-14" vacuum at
10-12 degrees BTC Not sure what cam I have because the receipt
is wrong (31-218-3 no such number) I guess it's a 31-218-2
Store that built it is out of business (1998 was built)
I mention that I had bumped the timing to 17degrees road tested
and up to 21degrees (no pinging)to get 16" vacuum and better performance.
They said 21 degrees would damage my engine plus my problem is the
power brakes or balancer has slipped.
After thinking it over I set the timing to 14 degrees rather be safe than sorry
They also said 13-14 is plenty of vacuum for "good brakes"?
Mine at 13-14 has a hard pedal and hard to stop. So I added a Crane Reserve
System Brakes are fine now.
Engine was built,new exhaust,checked the vacuum with all hoses
disconnected,tried another Carburetor,Crankshaft Damper is like new,
Rebuilt Power Brake Booster. If I back off to 12 degrees BTC
68 will lose power on acceleration not idle as smooth as 21degrees.
He never did say what the timing should be.
We have had the 68 since 1983 and never had any problems until
rebuilding the 302 with a mild street cam.
I told them about my power brake (hard pedal) I have a stock 302
2 bbl carb/Automatic Transmission that only had 13½-14" vacuum at
10-12 degrees BTC Not sure what cam I have because the receipt
is wrong (31-218-3 no such number) I guess it's a 31-218-2
Store that built it is out of business (1998 was built)
I mention that I had bumped the timing to 17degrees road tested
and up to 21degrees (no pinging)to get 16" vacuum and better performance.
They said 21 degrees would damage my engine plus my problem is the
power brakes or balancer has slipped.
After thinking it over I set the timing to 14 degrees rather be safe than sorry
They also said 13-14 is plenty of vacuum for "good brakes"?
Mine at 13-14 has a hard pedal and hard to stop. So I added a Crane Reserve
System Brakes are fine now.
Engine was built,new exhaust,checked the vacuum with all hoses
disconnected,tried another Carburetor,Crankshaft Damper is like new,
Rebuilt Power Brake Booster. If I back off to 12 degrees BTC
68 will lose power on acceleration not idle as smooth as 21degrees.
He never did say what the timing should be.
We have had the 68 since 1983 and never had any problems until
rebuilding the 302 with a mild street cam.