Personally, I think that cam is a about what I'd look for, for a 408 blower motor... (edited that).

What was Tony running in his magnacharged LS1 1st gen? That was like 230/230, wasn't it? (going to look)

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Here's the info:

348ci LS6 forged shortblock. LQ4 MTI Stage 2R heads (9.5 CR)
230/230 .581 114 cam

506 rwhp @ 5500 rpm
501 ft-lbs @ 4500 rpm

 

yes it was marc.

 

I thought my cam was pretty small for a 408.

I will check for vacuum in the intake tube and let you know what I find. It will take me a few days, sit tight!

Thanks

 

Has anyone thought that this may be a transmission problem....NOT a motor issue ??

Is it possible that you're "limping" the tranny at the top-end and it's pulling timing and/or fuel to keep itself together ??....my 80e will do that when it gets too hot while towing (it takes ALOT to do it but I HAVE done it....and you're making ALOT more power than me on ALOT less tranny), and I KNOW that the Allison will do it too, is it possible that there is some esoteric programming buried in there somewhere on the 65e that will do it too ??.....

The power loss you describe is EXACTLY what I feels like when I limp my 80e, it was explained to me that there is a limited peak torque input/heat produced combination that the transmission will accept before it starts to pull timing to protect itself.....I know that the 60e doesn't have this limit but the 65e might.....

 

The wider lobe seperation, decreased overlap and decreased duration helps build cylinder pressure. If the cam has a wide lobe seperation and lower duration numbers it wont hang the exhaust valve open at the same time as the intake. Any time that they are both open you are blowing boost right out the tail pipe.

 

true, but I calculate the overlap on that cam as -6

((220+224)/4 - 114) * 2

AFAIK that is zero overlap, and therefore no exhaust valve hanging open.

 

TurboB - you are calculating those numbers at .050 lift. The advertized duration on that cam is going to be much larger, more like 275-280 per lobe. So there is at least 50* of overlap between when the intake valve opens and the exhaust valve closes.

 

sweet post, i want to see this figured out.

still, as much as i respect Brian AND the radix package i think it is just too small for biger cube set up's. 1.7 60' times wi th 5000+lbs is a nice feeling, i remember my first 1.7's with my last truck, that is where you start to get that stick you to the seat/stomache drop feeling. i love that!

 

You got me there, Richard I always forget that part...

 

the cam is a bit large on the intake side, but not that bad for a 408. i agree, the radix just isn't big enough for this application.