DCI Ram Air Five Crate Engine

Photos of DCI Ram Air Five crate motor.

Videos of DCI Ram Air Five engine:

 

Feature	Detail
Block	Factory iron block hot tanked, bored & honed with deck plates, threads chased, magged, deburred, oil passages radiused, cleaned and painted.
Year	1970-1974
Deck Height	Stock, 10.225"
Crank	Eagle, Scat, or Ohio Crankshaft Forged 4340 steel crankshaft 4.25" stroke
Crank Preparation	Cleaned, inspected, checked for bearing clearances and journals out of round, micro-polished, and balanced
Balancer	Pioneer SFI Balancer
Rods	Eagle, Scat or Equivalent Forged 4340 steel H-Beam connecting rods
Rod Preparation	Cleaned, big and small ends checked and fitted if needed
Bearings	Speed Pro, King, ACL, Durabond or equivalent
Bearing Preparation	Cleaned and inspected, checked for clearance
Pistons	JE SRP, Speed Pro, Mahle, or equivalent Forged aluminum pistons and wrist pins 4.155" / 4.185" bore
Piston Preparation	Pin-fitted, deburred, weight-matched and cleaned
Piston Pins	Speed Pro, pressed or floating with double locks
Rings	JE, Speed Pro, Total Seal or equivalent file fit piston rings
Ring Preparation	Fitted to each individual bore, deburred, and cleaned
Rod Bolts/Head Bolts	ARP, GM main and head bolts
Balancing Specs	Balanced to within half a gram
Oiling System	Modified Factory
Windage Tray	None (they shred and come apart from rapid engine acceleration)
Crank Scraper	None
Oil Pan	GM stock replacement
Oil Pump	Melling high-volume 60 psi (disassembled, checked for clearance andcorrected if needed, deburred, cleaned and reassembled)

Feature	Detail
Heads	DCI RA5 aluminum head castings 380 to 400 intake CFM with 2.25" intake valve, 270 exhaust cfm with 1.700 exhaust valve
Chamber	TBD
Head Mods	Hot-tanked, blasted, magged for cracks, DCI Custom competition valve job 1.77-in valve, ported for application, competition valve job, bolt holes tapped, machined for positive oil seals, cleaned and flow-tested
Combustion Chamber Volume	TBD
Intake Flow	380 to 400 intake CFM with 2.25" intake valve
Exhaust Flow	270 exhaust cfm with 1.700 exhaust valve
Compression Ratio	10.5-1
Valves	SI stainless steel sever duty valves 2.25" intake, 1.70" exhaust
Retainers	Comp Cams 10-deg
Keepers	Comp Cams 10-deg
Valve Guides	DCI RA5 custom guide plates
Valve Seats	Best Gasket Viton positive
Rocker Studs	ARP 7/16"
Rocker Arms	Harland Sharp roller rockers 1.65 ratio
Pushrods	Trend 3/8" heavy wall chromemolly pushrods
Cam	LSM custom ground Billet roller hydraulic profile camshaft
Duration at 0.050	250/259
Lift	up to .700" lift
Centerline	TBD
LSA	109 to 112 lobe separation
Installed Position	TBD
Lifters	Howards solid roller
Valve Springs	Comp Cams or equivalent roller valve springs
Valve Seals	Viton valve stem seals
Seat Pressure	135 lb
Open Pressure	320 lb
Timing Chain	Comp Cams or equivalent double roller timing chain set

Feature	Detail
Intake	Edelbrock Performer RPM dual-plane (port-matched to heads)
Carburetor (not included)	Quick Fuel or Holley HP recommended
Carburetor Size	950 cfm
Carburetor Mods	Idle circuit re-calibrated for application, re-jetted for application as needed
Carburetor Jets	Application specific
Fuel Pump (not included)	Holley electric 150 gph, Holley regulator, fuel line size 1/2" recommended
Distributor (not included)	GM HEI or MSD billet, MSD 6AL,MSD Blaster, Taylor 8mm recommended
Total Timing	32 degrees
Initial Timing	20 degrees
Mechanical Advance	12 degrees
Vacuum Advance	None
Headers (not included)	Hooker, Hedman, Doug's, or Flowtech, 1.75", 32 to 36" long, 3" diameter collectors recommended
Gaskets	DCI

Learn more about DCI Ram Air Five parts

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