DustyNova442

Would the 243 Heads be okay on a 408 stroker I'm looking for a lot of bottom end torque ill end up putting a level 2 performabuilt behind it it also has 4.10s in the back its a 2001 Silverado 1500,

How high can I go on the compression and still run 85 octane?

A.R. Shale Targa

iTrader: (2)

EIGHTY FIVE
cat **** has more octane than that geezus
I would keep it around 10:1 and run at least a 230@.050" intake lobe cam
Need to keep the cranking compression under130 for that diarrhea fuel

big hammer

85 octane wtf

Gooze_1

iTrader: (3)

Maybe E85?

DustyNova442

Lol here in Utah we have 85 octane 88 and 91

DustyNova442

Ill probably run 88 octane anyway what's the specs on the 243 heads

tug686spd

iTrader: (11)

If trying to run 85-88 octane theres no need for 243/799 heads. Youll need to keep compression down so just use the 317's that were on the 6.0. The 317's and 243/799' share the same intake and exhaust port but 243/799 have 64cc chambers and 317 have 72cc chambers.

HCI2000SS

iTrader: (2)

If you have 91 why not run at least that?

Tuskyz28

So in Utah yall have a option to run water for gas ?

Darth_V8r

iTrader: (4)

Water would have a higher octane rating. Lol

DustyNova442

Yeah they claim it has something to do with the altitude and us not needing 87 octane up here idk i think its just crap the liquor here is watered down to

joecar

What is the price difference, are you really saving that much money...?

( not even considering vs cost to repair engine )

wannafbody

iTrader: (2)

243's would work as a budget head but you'd make more hp with a larger intake port around 245cc. I think Mast, Edelbrock and World make large port cathedral heads.

G Atsma

So do AirFlow Research and Trick Flow Specialties

DustyNova442

the price difference in gas isnt a whole lot around here, Whats the stock compression ratio in a 6.0 anyway?

2xLS1

iTrader: (25)

It's probably because of the elevation he is at. At high elevations the low octane fuels do not need to be as high a number as at sea level and the fuel suppliers typically supply what will work in that area.

axld

what trans is that "level 2" ?

Brons2

This. Common practice in the Rocky Mountain region and nearby states. New Mexico, Colorado, Wyoming, Montana and Utah come to mind.

The mean elevation for the entire state of Utah is 6100 ft per Wikipedia:
https://en.wikipedia.org/wiki/List_o...s_by_elevation

That said I'd still run 91 in any application where you're trying to make power.

DustyNova442

http://www.performabuilt.com/level-2.html

axld

thanks dusty !I checked the whole site out, looks like my trans upgrade with my new 6.0 build.