G R and H timing gear info

[Fetch]

Good Day,
Getting back to basics. Great post, wish I had read this a couple of years ago.
In rebuilding my '64 310 G15 engine I decided to get a new cam and bearings. The engine had been bored .30 by the previous owner but never reassembled. The new cam I was told is an SAE cam.
I installed the original chain and gears set to the SAE marks. The timing chain has the metric marks on it as shown in the pictures.
Since rebuilding the engine, it has had a continuous backfire through the carbs. After checking many other issues I decided to go back and replace the chain and gears.
I purchased the new chain and gear set (datsunparts) to install. I presume I need to set these to the (E-Early) SAE marks or am I missing something?
Thank you for the information.
Dan

[Curtis]

Yes, early.

[Gregs672000]

"Backfire through the carbs..." check your firing order too. 1 3 4 2. Ran my U20 with Mikuni carbs 80 miles with the firing order off when I first built it 36 yrs sgo... not sure that's possible with SUs, but it ran while constantly snarfing/sneezing out the carbs.

[Curtis]

Make sure you have the right cam bolt, SAE and Metric are different.

[Fetch]

Greg, firing order is good, I checked it many times.
New plugs, cap, point, rotor and plug wires. Though it did seem to backfire on the rear carb, cylinders 3-4.

Curtis, I presume SAE bolt is good, came with the cam and lifters.

After I get the new gears installed and running there are a few more items I am going to check.

Dan

[Curtis]

Metric bolt does fit on the SAE cam I believe. I'd have to go check mine.

[david premo]

The SAE bolt is about.5 millimeters smaller than the metric bolt. That’s why the SAE bolt fits in both camshafts.
Dave