454 new long block timing questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**THI** · 01-02-2022, 01:38 PM

Do the best you can to get the distributor dropped in at 0* - manually roll the engine to #1 TDC and get the roter pointing at the #1 wire on the cap. Once it starts get the RPM up to 2,000 ASAP and vary the RPM between 2,000 and 2,500 for at least 20 minutes - this will get the lifters spinning and splash oil on everything! Once you are done with that initial run, change the oil and filter and again use a high zinc oil or zinc additive. I just did this on a 400 SBC and 383 SBC both with flat cams and had no issues on break-in.

After the break-in run, you can set the timing and make any carb adjustments.

01-02-2022, 01:38 PM	#10
THI Senior Member Join Date: Jan 2017 Location: Traverse City, MI Posts: 221	Re: 454 new long block timing questions Do the best you can to get the distributor dropped in at 0* - manually roll the engine to #1 TDC and get the roter pointing at the #1 wire on the cap. Once it starts get the RPM up to 2,000 ASAP and vary the RPM between 2,000 and 2,500 for at least 20 minutes - this will get the lifters spinning and splash oil on everything! Once you are done with that initial run, change the oil and filter and again use a high zinc oil or zinc additive. I just did this on a 400 SBC and 383 SBC both with flat cams and had no issues on break-in. After the break-in run, you can set the timing and make any carb adjustments.



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