Hydroboost vs Vacuum Boost Braking

[mestorod70]

Having an LS engine or any other brand under the hood makes no difference as
far as brake performance.
What does make a difference is displacement and cam duration.
Cam duration effects vacuum and the bigger the engine the more duration can be
used.
Put a 230 degree at 050 lift cam in a 327.....nasty idle and low vac.
Same cam in a 400 and its very tame nice idle ...lots of vac.

[size-o]

The LS I'm looking at is a GM crate motor LS376/525. Below are the spec's. Hmm, I may have an issue so perhaps hydroboost might be the way to go.

Part Number: 19301360
Engine Type: LS-Series Gen-IV Small-Block V-8
Displacement (cu. in.): 376 (6.2L)
Bore x Stroke (in.): 4.065 x 3.622 (103.25 x 92 mm)
Block (P/N 12623967): Cast aluminum with six-bolt, cross-bolted main caps
Crankshaft (P/N 12597569): Nodular iron
Connecting Rods (P/N 12607475): Powdered metal
Pistons (P/N 19207287): Hypereutectic aluminum
Camshaft Type (P/N 88958770): Hydraulic roller
Valve Lift (in.): 0.525 intake / 0.525 exhaust
Camshaft Duration (@0.050 in.): 226° intake / 236° exhaust
Cylinder Heads (P/N 12629063): Aluminum L92-style port; “as cast” with 68-cc chambers
Valve Size (in.): 2.165 intake / 1.590 exhaust
Compression Ratio: 10.7:1
Rocker Arms (P/N 12569167 int): Investment-cast, roller trunnion
Rocker Arms (P/N 10214664 exh): Investment-cast, roller trunnion
Rocker Arm Ratio: 1.7:1
Recommended Fuel: 92 octane
Maximum Recommended rpm: 6600
Reluctor Wheel: 58X
Balanced: Internal

Thanks,
Perry

[size-o]

Or should I consider this motor. GM says it largely made for the drag strip. I'm looking for dumb, crazy RELIABLE power that I can get on it and cruise the hwys with.

Part Number: 19329009
Engine Type: LS-Series Gen-IV Small-Block V-8
Displacement (cu. in.): 376 (6.2L)
Bore x Stroke (in.): 4.065 x 3.622 (103.25 x 92mm)
Block (P/N 12623967): Cast aluminum with 6-bolt, cross-bolted main caps
Crankshaft (P/N 12597569): Nodular iron
Connecting Rods (P/N 12607475): Powdered metal
Pistons (P/N 19207287): Hypereutectic aluminum
Camshaft Type (P/N 88958770): Hydraulic roller
Valve Lift (in.): .525 intake / .525 exhaust
Camshaft Duration (@0.050 in.): 226° intake / 236° exhaust
Water Pump (P/N 12604630): LS3
Cylinder Heads (P/N 12629063): Aluminum L92-style port; “as cast” with 68-cc chambers
Valve Size (in.): 2.165 intake / 1.590 exhaust
Compression Ratio: 10.7:1
Rocker Arms (P/N 12569167): Investment-cast, roller trunnion
Rocker Arms (P/N 10214664 exh): Investment-cast, roller trunnion
Rocker Arm Ratio: 1.7:1
Recommended Fuel: 92 octane
Maximum Recommended rpm: 7000
Reluctor Wheel: 58X
Balanced: Internal

Perry

[size-o]

Hmm, I should have read the last post before posting. Seems the only difference is the water pump and higher rpm.

Perry

[vinces427bb]

Originally Posted by size-o

Hmm, I should have read the last post before posting. Seems the only difference is the water pump and higher rpm.

Perry

go for the one with the 6600rpm max.
that looks like a great engine for a new one.
are you set on a paddle shifted tci 6speed auto

[size-o]

The paddle shifter is an option. The 6X comes standard with their outlaw shifter:

https://www.summitracing.com/int/par...1641/overview/

The two buttons on the backside of the pistol grip can be used for transbrake and nitrous, or, manual shifting. I did the research and it sounds like people have had issues with the paddle shift. Besides I think the pistol grip looks badass.

Perry