69mach1build 24 Report post Posted September 7, 2016 I don't know which timing tab location and whether I need a 3 bolt or 4 bolt? Block is a '69 and crank is a 4.100 Scat. 1 Xde4hewkew reacted to this Quote Share this post Link to post Share on other sites
RPM 1,262 Report post Posted September 7, 2016 Check the front of the crank for number of holes, or call Scat or Google with the part number. Quote Share this post Link to post Share on other sites
buening 69 Report post Posted September 7, 2016 Bolt number is dependent on the crank pulley you are using. If its original pulleys it should be 3 bolt (confirm by looking at your own pulley), as 70 and after used 4 bolt pulley. You should also verify the imbalance of your crank (28oz, 51oz, or 0oz). The stock is 28oz, but with aftermarket cranks it isn't always stock. The 51oz is late model imbalance and not likely yours, but some performance builds convert to 0oz imbalance. The flywheel imbalance would also have to match the crank and dampener imbalance, so to go away from 28oz imbalance requires a different flywheel too. Quote Share this post Link to post Share on other sites
BuckeyeDemon 211 Report post Posted September 7, 2016 what imbalance is the crank (28 oz-in external or 0 oz-in internal)? where is the inlet from the radiator (lower passenger or lower driver side)? how many bolt holes is your crank pulley (3 or 4)? Quote Share this post Link to post Share on other sites
