Has anyone ran NOS on the 400hp 355 Crate motor that Year One has been selling for the past year for $3,000. It has hyper. pistons and a cast iron crank. Will 100hp shot blow it up? I blew the heads off of it because of cheap head gaskets last year. But now back together it is running great and I want to go faster!!!

I'm a little leary on the hyper. pistons,but there are guys spraying 125-150 on lt1(93-97 fbody cars)with no problem just make sure you have a decent fuel system and double check your timing and go one step colder on your spark plugs and you should be ok.

Sorry if this is a dumb question but how do you figure out how to buy hotter of cooler spark plugs. Is it listed on the box?

What kind of plugs are you using?Most spark plug catalog books will have a heat range chart.

Not sure of the heat range currently. Do you have any reccomendations? Brand and heat range for my setup?

Did you buy the crate engine new?If so they should give a recomended plugh let me know and I can find out what plug you need

I bought it new from Year One

Engine Specifications:
·Horsepower: 400+
·Torque: 400+ ft/lbs
·Compression ratio: 9.5:1
·Dyno-tested: Yes, includes balancer and 14" flexplate
·Dyno sheet: Included with engine's output
·Vacuum produced: 12hg @ 800RPM
·Recommended fuel: 92 octane
·Max recommended RPM- 6000
·Block: Seasoned 4-bolt iron
·Crankshaft: Nodular iron
·Pistons: Hypereutectic
·Connecting rods: Powdered metal
·Camshaft- Hydraulic roller
·Valve lift:.520"
·Duration @ .050" (int/exh): 218deg/228deg
·Rocker arms: 1.6:1 ratio
·Cylinder heads: Ported Vortec
·Valves: Stainless steel 2.02 int/1.60 exh
·Valve springs: Heavy duty
·Bore x Stroke: 4.030" x 3.48"
·Intake manifold: Dual-plane aluminum
·Oil pan, timing cover, valve covers included
·Engine fasteners: High tensile strength

Running MSD and Pro Bill Distributor with 750 Speed Demon Carb

You can start with a ngk stock# 4177 tr6 one step colder than a tr6 a recomended plug for your vortech heads.

I'll try them at the track this weekend, Thanks, MC

Also make sure you retard your timing at least 6 degrees for your first run/pull.Holley recomends 4 degrees with an additional 2 degrees of saftey margin.