Hello Things have changed for my 70 c10 build, I have a cheap ready to go 6.0 block so im that route. im using floating rods/crank from my 06 5.3l block and 862 prc 2.5 heads from Texas speed. and ls9 head gaskets which I think are .55. I need help finding a piston that will be pump gas friendly. i was looking at the Summit ls forged line they either have 2cc flat or 12cc dish. 12cc if i did math right would put me 9.95 :1 with 4.0 or 10 .15 :1 with 4.05 or 10.07 :1 with 4.030. I think the 2cc flat top would be to much for street truck 11.18 :1 with 4.0 or 11.4 :1 with 4.05 or 11.31 :1 with 4.030

That's if my numbers are right any input would be helpful! Thanks
6.0 block, truck norris cam, texas speed 862 PRC stage 2.5, TBSS intake

 

Probably OK, depends on cam and how much timing is in as well. Intake air temp, coolant temp, etc…. Others have more experience, but it doesn’t look crazy to me.

 

Truck norris cam 212/22X, .552/.552, 107 LSA
Oregon doesnt get much above 90s i want to stay 92 pump gas

 

A good tune and that thing will be a very strong running with either piston, but if no boost is planned I would do the flat tops for sure.

 

Would there be a better cam? I already have the truck norris but can sell

 

Would be a great cam for a street truck, im running one in my 2500HD.
If your wanting a little more rowdy engine you could go with a bigger cam, which would require a stall.
What gear and stall are you planing on running?

 

Have not gotten that far i was thinking 2800 or so and 3.43. I would still like to tow alittle with the c10.

 

For what you want to do, stick with the Truck Norris cam. It will give plenty of low end but still sound nasty enough to satisfy.

 

Yep that will be a perfect combo

 

I found some 799 heads cheap
but one needs repaired so im not sure if a skim mill will fix it

 

What the heck, looks like someone pressed a ground strap into the head lol.
can you feel that with your finger?
if so you will probably have to take them to a machine shop and see how much you will need to shave off to clear it up.

 

As an FYI our Pro LS forged pistons sit .005" in the hole with a standard 9.240" deck height. Also, decimal point placement is important. The bore size would be 4.005" with .005" over pistons. LS9 head gaskets are .054" per the GM NAL-12622033 LS9 head gasket. With all other above compression calculator specs remaining the same, you'd be right around 10.9:1. With 65cc 799 heads you'd be right around 10.4:1. For further info on our pistons check out the instructions page.

If this is staying N/A we'd go with the 2cc flat tops to keep compression up. No need to go more than .005" over unless the bores dictate otherwise. Running 92 Octane you should be good to go at 10.4:1 even with some towing. You'll just have to watch the logs. You may find that you have to be a bit conservative on the timing when towing.

 

I went ahead and ordered the 2cc forged but i did the 4.030 as the block was bore out to that. Going to be running my 61.15 ported 862 with 2.02/1.57 valves. May down the road change the heads for 64cc if i do low boost

 

You'll have a strong running 70 C10 with this combo with compression right around 11:1. You'll be good with a good custom tune on 92 Octane for daily use. Just watch the logs for towing duties. You might find that you'll have to be conservative on the timing. Some octane booster wouldn't be a bad idea to have handy just in case