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KRE MR-1 Block and High-Port Heads Build - Big-Inch Bracket Bruiser - Pontiac Tech

High Performance Pontiac Engine Buildup Worksheet
Engine Displacement505 ci
Horsepower851
Torque716 lb-ft
Bore/Stroke4.350/4.25-in
Block/Crank ComboMR-1 cast-iron/Ohio Crankshaft forged
Bore/Stroke Ratio1.0235:1
Rod/Stroke Ratio1.6:1

Bottom End
Block DescriptionNew MR-1 cast-iron
PreparationBore to size, finish hone to size, wash and assemble
Deck Height10.240-in
CrankNew Ohio Crankshaft 4.25-in stroke, forged
PreparationBalance assembly
BalancerATI with MSD crank trigger
RodsGRP 5100 series aluminum
Rod Length6.800-in
BearingsFederal Mogul
PreparationOil feed holes opened up
PistonsRoss 4.350-in forged flat-top
Piston-To-Deck Height0.001-in
Piston PinsRoss
Method Used To Retain Piston Pins In PistonsSpiral locks
RingsTotal Seal plasma-moly low-tension 1/16, 1/16, 3/16 oil
PreparationFiled to fit
Rod BoltsARP 2000
Main And Head StudsARP

Oiling System
Crank ScraperTin Indian Performance
Oil PanMilodon
Oil PumpMelling M54DS
PreparationSpring shimmed to increase pressure

Heads
BrandKRE High-Ports
ChamberHeart-shaped fast burn
Head ModsGasket match on stock HPs/then ported
Combustion Chamber Volume56 ccs
Maximum Flow At 28 Inches Of Water:  
Intake330-cfm as-cast at 0.700-in lift/380-cfm at 0.800-in lift ported
Exhaust255 at 0.700-in lift as-cast/270 at 0.800-in lift ported
Compression Ratio15.14:1
ValvesFerrea SS 1200 series 6.200-in length
Intake Size2.200-in
Exhaust Size1.70-in
Angles Used In Valve Job45-deg seat, 30/60 top and bottom
RetainersComp Cams Titanium 10-deg
KeepersComp Cams 10-deg
Valve GuidesBronze
Valve SealsPC
Rocker Studs7/16-in ARP
Rocker ArmsScorpion 1.6:1 full roller
PushrodsComp, 3/8-in, 10.400-in length

Cam
BrandComp Cams custom solid roller (see text for specs)
LiftersCrower solid roller
Valve SpringsComp Cams
Seat Pressure230 lbs
Open Pressure620 lbs
Timing ChainRollmaster double-roller

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Pontiac Solstice Research
Pontiac Solstice Get updated on all your car buying needs from safety features, to specs, to crash test ratings and options. Get all the information you need if you are interested in buying a new car like the Pontiac Solstice. The L4 standard engine in the Solstice gives you 173 horsepower with an estimated 22 mpg. It has a comparable trade in value which should come in handy when you go to shop for your next car. The Pontiac Torrent and the Pontiac G6 are other vehicles that might interest you.

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