Recommendations in selecting camshaft
03-08-2005 | 12:43 AM
#11
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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.
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.
03-08-2005 | 02:03 AM
#12
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From: Stockholm, Sweden
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...
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...
03-08-2005 | 10:45 AM
#14
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Re: Recommendations in selecting camshaft
Originally Posted by tomas_wallin
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...
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...
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.
03-08-2005 | 10:46 AM
#15
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Re: Recommendations in selecting camshaft
Originally Posted by tomas_wallin
Is there anything else that might increase the hp, like a stub stack or carb spacer etc?! 
Those are minimal and only a dyno will tell for sure.
03-08-2005 | 10:55 AM
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Re: Recommendations in selecting camshaft
Originally Posted by Griff
I think the rating is measured differently in Europe. I don't think the octane rating is comparable to US octane #'s.
"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.
But we also pay ~$5,5/gallon or $1.47/liter
Last edited by tomas_wallin; 03-08-2005 at 11:10 AM.
03-08-2005 | 10:57 AM
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Re: Recommendations in selecting camshaft
Originally Posted by Griff
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.
With the 330 bottom, I wouldn't turn it to 5400 either but I would run it to 5000-5100.
Do you still think the 241 cam is the one to use?!
03-08-2005 | 12:28 PM
#18
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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.
03-08-2005 | 12:57 PM
#19
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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 $$ you want to spend...
With the flat tops in a 330 and the Vortec heads, the CR will be around 9:1. The heads are "large" oval port but they have small valves.
I think the crane 241 cam is a reasonable choice but the heads may require some work for that much lift.
Tomas,
If it were me, I would go with a cam that did not require machine work on the heads.
The Vortec heads come with wimpy single valve springs and rotators.
A bigger than stock cam will require stronger springs and spacers in place of the rotators.
Also, If you use a cam from other than GM, you will need to change from the non-adjust rocker system.
It's all a matter of how much $$ you want to spend...
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Patrick
Last edited by Pat McPherson; 03-08-2005 at 01:00 PM.
03-08-2005 | 05:16 PM
#20
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From: Omaha/LOTO
Re: Recommendations in selecting camshaft
Originally Posted by tomas_wallin
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...
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...
Octane IS measured differently in the US than Europe.
http://www.type2.com/bartnik/octane.htm
Your 95 octane = 91 US Octane
