Hello all,

This is a cross post from LS1-tech and LS1Truck

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Build Spec:
LM7 5.3 bored and stroked to 383ci
243 LS2 heads
LS6 Cam (405hp version)

using a Walboro 255lph and racetronix 38lb/hr @43.5 PSI & 44lb/hr @ 58 PSI injectors for fuel system upgrades.

Shooting for over 400 on hp & tq

What compression ratio should I be shooting for on this motor? I believe that the stock compression ratio is about 10:1

Going in a 5000lb truck.
I want to run pump gas. preferably 87 octane, but I would go with 92 octane if the benefits were there.

Also would the stock 78mm throttle body be sufficient to supply airflow to this type of motor?

If I was to go with a bigger throttle body which one would you go with and would it need a different intake manifold?

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Thanks for all the help guys!

Tyler

 

I need a suggestion on a converter for my build.
I ended up deciding on a TR220/220-114 cam.

I have a TB stall available for a decent price. Is this enough stall for this type of cam in this cubic inch of motor? i think its in the 2000-2400 range.
maybe a 3000 stall? or no stall at all?

what do you guys think?