Re: Recommendations in selecting camshaft
 

The 95 octane will actually hurt performance. It won't burn as completely.

What do you mean by stock bottom end??? Stock 454Mag or 7.4????

Reving past 5000 rpms will not cause reliability issues as long as the engine has the right parts.

Re: Recommendations in selecting camshaft
 

It's a 7,4 330hp.

The 95 is the lowest octane here in Sweden, so it's pretty hard to use anything lower than that. We got 95, 96 and 98 octane in the pumps...

Re: Recommendations in selecting camshaft
 

Is there anything else that might increase the hp, like a stub stack or carb spacer etc?! :rolleyes:

Re: Recommendations in selecting camshaft
 

I think the rating is measured differently in Europe. I don't think the octane rating is comparable to US octane #'s.

With the 330 bottom, I wouldn't turn it to 5400 either but I would run it to 5000-5100.

Re: Recommendations in selecting camshaft
 

Those are minimal and only a dyno will tell for sure.

Re: Recommendations in selecting camshaft
 

Copied from howstuffworks.com:
"Eighty-seven-octane gasoline is gasoline that contains 87-percent octane and 13-percent heptane (or some other combination of fuels that has the same performance of the 87/13 combination of octane/heptane)."

The difference between 95 octane in the US and 95 octane in Sweden can't be that significant, if the text is correct. :evilb:

But we also pay ~$5,5/gallon or $1.47/liter :mad:

Re: Recommendations in selecting camshaft
 

Do you still think the 241 cam is the one to use?!

Re: Recommendations in selecting camshaft
 

I don't know for sure if its the "best" one, but it will certainly work. I just don't know enough about the overall combo that you have with the comp ratio and vortec heads.

Re: Recommendations in selecting camshaft
 

Griff,
With the flat tops in a 330 and the Vortec heads, the CR will be around 9:1. The heads are "large" oval port but they have small valves.
I think the crane 241 cam is a reasonable choice but the heads may require some work for that much lift.
Tomas,
If it were me, I would go with a cam that did not require machine work on the heads.
The Vortec heads come with wimpy single valve springs and rotators.
A bigger than stock cam will require stronger springs and spacers in place of the rotators.
Also, If you use a cam from other than GM, you will need to change from the non-adjust rocker system.
It's all a matter of how much $$ you want to spend... :drink:

Re: Recommendations in selecting camshaft
 

Octane IS measured differently in the US than Europe.

http://www.type2.com/bartnik/octane.htm

Your 95 octane = 91 US Octane