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

High Performance Pontiac Engine Buildup Worksheet
Engine Displacement	505 ci
Horsepower	851
Torque	716 lb-ft
Bore/Stroke	4.350/4.25-in
Block/Crank Combo	MR-1 cast-iron/Ohio Crankshaft forged
Bore/Stroke Ratio	1.0235:1
Rod/Stroke Ratio	1.6:1

Bottom End
Block Description	New MR-1 cast-iron
Preparation	Bore to size, finish hone to size, wash and assemble
Deck Height	10.240-in
Crank	New Ohio Crankshaft 4.25-in stroke, forged
Preparation	Balance assembly
Balancer	ATI with MSD crank trigger
Rods	GRP 5100 series aluminum
Rod Length	6.800-in
Bearings	Federal Mogul
Preparation	Oil feed holes opened up
Pistons	Ross 4.350-in forged flat-top
Piston-To-Deck Height	0.001-in
Piston Pins	Ross
Method Used To Retain Piston Pins In Pistons	Spiral locks
Rings	Total Seal plasma-moly low-tension 1/16, 1/16, 3/16 oil
Preparation	Filed to fit
Rod Bolts	ARP 2000
Main And Head Studs	ARP

Oiling System
Crank Scraper	Tin Indian Performance
Oil Pan	Milodon
Oil Pump	Melling M54DS
Preparation	Spring shimmed to increase pressure

Heads
Brand	KRE High-Ports
Chamber	Heart-shaped fast burn
Head Mods	Gasket match on stock HPs/then ported
Combustion Chamber Volume	56 ccs
Maximum Flow At 28 Inches Of Water:
Intake	330-cfm as-cast at 0.700-in lift/380-cfm at 0.800-in lift ported
Exhaust	255 at 0.700-in lift as-cast/270 at 0.800-in lift ported
Compression Ratio	15.14:1
Valves	Ferrea SS 1200 series 6.200-in length
Intake Size	2.200-in
Exhaust Size	1.70-in
Angles Used In Valve Job	45-deg seat, 30/60 top and bottom
Retainers	Comp Cams Titanium 10-deg
Keepers	Comp Cams 10-deg
Valve Guides	Bronze
Valve Seals	PC
Rocker Studs	7/16-in ARP
Rocker Arms	Scorpion 1.6:1 full roller
Pushrods	Comp, 3/8-in, 10.400-in length

Cam
Brand	Comp Cams custom solid roller (see text for specs)
Lifters	Crower solid roller
Valve Springs	Comp Cams
Seat Pressure	230 lbs
Open Pressure	620 lbs
Timing Chain	Rollmaster double-roller