I need advice on what is the better choice of motors. It will be used in a 6spd
c5 vette with STS gt32 turbos. Then down the road go back to a procharger.
750-800 rwhp is the goal!

The car will be used at 4500 ft- 8000ft elvation and driving long mountain roads.....so rpms will be held for a good amount of time

My main question is what is the better buy?

Is iron block and 9.5 compression better or is aluminum and 9.9 better?
How about heat?

Also price?

Motor 1 i can buy for around $5500 listed below..
PRC Stage 2.5 LS6 Cylinder Heads: Stainless 2.04/1.60 GM Valves
GM 6.0L Cast-Iron Block w 9.5 compression
Callies CompStar 4.0 Stroke LS1 Crankshaft
Callies CompStar LS1/LS2 Connecting Rods
Diamond Racing Forged Piston: 4.010 Bore, 4.000 Stroke, 6.125 Rod Length 1.115 CD, -28cc Dish, HD H-13 Wrist Pins
Texas Speed & Performance Exclusive Total Seal Ring Set: 4.010”+.005”, 1.5mm AP Stainless Top, 1.5 mm Napier 2nd, 3mm Oil Camshaft Bearing Set
Clevite LS1 H Rod Bearing and H Main Bearing Set for LS1 Stroker Applications
ARP Main Stud kit
GM LS1 Oil Restrictor, Oil Galley Core Plug, Large Coolant Plug, Small coolant plug
Assembled with PRC Double Valve Springs
Comp Cams Custom Order Camshaft: 232/240 .595/.609 115
TS&P 7.40 Chromemoly Pushrod
LS1 MLS Cylinder Head Gasket, 3.91 Bore, .040 Thickness
ARP 12 Pt. Head Stud Kit for LS2
Comp Cams OE-Replacement Hydraulic Roller Lifters,
GM LS1/LS2 Rear Main Seal Housing Gasket
GM LS1/LS2 Timing Cover Gasket, Valley Cover Gasket Oil Pump O-Ring
GM LS1/LS6 Balancer pulley Bolt Oil Pan Gasket
GM LSX Rear Main Seal, Front Crankshaft Seal
GM LS1 Water Pump Gasket
__________________________________________________ _______________
Motor 2 i can get for about $6000...listed below

Built by Texas Speed - Forged LS2 402 Stroker
Eagle Forged Crank
Eagle H-Beam Forged Rods
Forged Diamond Pistons -15cc Dish
24X Tooth Reluctor
Total Seal Steel Top Rings w/ Napier 2nd
ARP Main Studs
ARP 2000 Rod bolts
Ported LS6 Oil Pump
LS7 Lifters
Chromemoly 7.40 Pushrods
160 Degree Thermostat
LS2 Double Roller Timing Chain
LS2 Valley Cover
LS2 Cam and Knock Sensor Extension Harness for LS6
LS2 Knock Sensors
LS6 Rocker Arms
Crank and Pulley Pinned for Supercharger
ARP 12 Pt. Head Studs
NGK TR6 Spark Plugs
LS6 Intake Manifold
LS6 Throttle Body
LS6 Fuel Rails
LS6 Coil Packs
MSD Spark Plug Wires
Red LS6 Valve Covers
LS6 Oil Pan
PFADT Oil Cooler Block w/ Oil Lines (oil cooler was damaged)
Engine Mount Brackets (modified to clear the new engine block)

Heads - Included with engine

Patriot Stage III Ported LS6 Heads with 68cc Combustion Chambers, 2.08" Intake Valves and 1.60" Exhaust Valves, Patriot Gold Dual Valve Springs, Titanium Retainers

68cc combustion chambers and -15cc dish yield 9.9:1 Compression Ratio

Cam - Included with engine

Custom Ground Comp Cam - Duration 228/232 @ 0.050" Total Lift of 0.588"/0.595" and LSA 115Deg w/ 1Deg of ground-in advance.

Engine Accessories Included - Included with engine

Starter
Alternator
Water Pump
AC Compressor
Comes with '04 Power Steering Bracket (stronger bracket needed for added strain from Supercharger)
Only accessory missing is the Power Steering Pump

thanks for your input!

 

the iron block will kill the handling characteristics of the vette, i personally would stay aluminum

 

agreed Elias, it will also shed the heat much better from long periods of running hard. I see no significant reason to choose the Iron motor over the aluminum

 

alum for the win.