When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
In shopping for parts for my 360, I came across an adjustable timing set from Summit, part number SUM-G6608. 4ºadvanced, straight up, or 4º retarded. Double roller for a good price, so I'm going to get it, but what would be the best place to set it? I know the factory one was 4º retarded, and I'll see improvements to torque at straight up and advanced, but is there any real thing to be concerned about? This will specifically be a hauling truck, towing trailers, and has a four speed with a 3.73 rear end so torque would help-
Has anybody run an advanced timing set on a 360, and does it run out of power at a noticeably lower rpm?
It will basically move the power rpm band around. Not sure how much you'll actually see/feel in the seat of your pants.
Most camshafts are ground for straight up. Unless you get a degree wheel and really check you'll be guessing where it's actually at. It could be a few degrees one way/the other depending on quality of the grind. I'd put it straight up and run it.
I'm sure you've heard this already....make it a 390 and put some compression in it. Getting the compression into the 9.5 area takes the pooch right out of it.
I'm not building a speed demon, it's a hauling rig. I figure if my old 300-6 can haul a loaded trailer at highway speeds, there's no reason why this one shouldn't. I'm just trying to put the right parts in first time around.
The logic behind the change to 390 and compression is that an engine so equipped uses about the same amount of fuel as the 360 to make lots more power.
I got the same timing set for my 360, I thought the engines were set straight up. learn something new everyday. I was going too set mine up straight up but with 3.54 maybe I will try 4 degree retarded.
That is the Timing setting(distributor), not the camshaft timing which is what this is about. Advancing or retarding the camshaft moves the powerband up/down.