im looking at the gm fastburn crate motor it has a zz4 block
i was wondering if the bolck will fall into place or will it require some modufucation
75 L-48

 

That should bolt right up. Your car came with a 350, and the zz4 is a 350 with fast burn heads and other hi-po goodies. Nice choice!

Kelly

 

y thank you ill post pics

 

cool cant wait to see pics of a bolck

modufucation

 

No mods, I put one in my 75. Exhaust manifold will not fit, good excuse for headers

Here's a link to a helpful writeup on the conversion:

https://www.corvetteforum.com/techti...=167&TopicID=3

 

Here is another documented writeup as well:

ZZ4 Install in a '77 C3

 

My avatar is a ZZ4 385 FB w/alum vortec heads. It just drops right in.

 

you will need:
-corvette water pump and grind 1 bolt
-larger than stock header to cover exhaust port
-flywheel or flexplate for 1 piece rear main seal SBC
-move water temp sensor near Thermostat

remeber: don't hook vaccum advance until you change vaccum spring in the HEI!! (if not you will have tooooooo much vaccum advance)


If you have extra $$$ add a LT4 hot cam kit (camshaft and 1.6 roller lifter)and you will have a ZZ430 clone (see signature)

 

zz430 data:
Horsepower: 430 @ 5800 RPM
Torque: 430 Ft. Lbs. @ 4000
Displacement: 350 cubic inches
Bore x Stroke: 4.00 inch x 3.48 inch
Max. Rec. RPM: 5800
Comp. Ratio: 9.6:1
Block: 10105123 Four bolt main, cast iron.
Crankshaft: 12556307 Forged 1053 steel and balanced to the connecting rods and pistons, 1-piece rear seal.
Connecting Rods: 10108688 Forged, powdered metal steel, 3/8” bolts
Pistons: 10159436 High silicon aluminum (Hypereutectic) with offset pins.
Piston rings: 12528817 Low tension, production size.
Camshaft: 24502586, LT4 HOT cam, hydraulic roller tappet
Lift: .525” I, .525” E; Duration @ .050: 218° I, 228° E
Centerline: 109° ATDC (After Top Dead Center) intake, 115° BTDC exhaust
Timing Chain: 8 mm single roller design
Intake Manifold: 12366573 Aluminum, dual plane, no EGR
Cylinder Heads: 12464289 Fast Burn, aluminum, includes valves and springs.
23° valve angle, Valve Diameter (Intake/Exhaust): 2.00” / 1.55”, Chamber Volume: 62 cc
Intake Valves: 12555331 1996 LT4 2.00”
Exhaust Valves: 12551313 1996 LT4 1.55”
Valve Springs: 12551483 1996 LT4
Rocker Arms: 12370839 GM 1.6:1 self aligning roller rockers
Valve Lash: Zero
Spark Plugs: ACDelco MR43LTS Gap @ .045 for HEI distributor.
Fuel: Premium unleaded - 92 (R+M/2), in other words 92 Octane Premium pump gas.
Ignition Timing: 32° total @ 3000 RPM with vacuum advance line disconnected and plugged. This setting will produce 32° of total advance at wide open throttle (WOT).
Firing Order: 1-8-4-3-6-5-7-2
Oil Pressure, Normal: 40 psi @ 2000 RPM
Oil Filter: ACDelco P/N PF1218 same as GM P/N 2516056. This is a long style filter that holds approximately 1 quart of oil.
Oil Pan: 12557558 5 quart with PF1218 oil filter.
Oil: SAE 10W-30
Note: The GM ZZ430 came from the factory with Mobil 1 10W-30 oil. We do not recommend using synthetic or high lubricant oils or additives until after the engine is completely broken in. After the engine broken in, you can thoroughly flush the engine of the organic oil and replace it with synthetic. Do not mix different types of oil.
Distributor: GM HEI
Valve Covers: Fast Burn 385 black valve covers.

 

Can someone elaborate on this?

 

I put a ZZ4 crate motor in my '75 coupe in 1998.
I see all the other cautions have been listed already..., water pump bolt, etc.
The thing that took a while to solve was the flywheel inspection plate cover for the lower part of the transmission. I tried 5-6 from GM and none would fit due to the new one-piece rear motor seal.. I ended up cutting up my original to provide clearance around the seal. Works fine.
I used a Holley on my with a drop base air cleaner housing. Headers to a full dual set-up.
This engine install was the best thing I ever did. It really brought back the fun-factor in the car.
Autocrossing is much more fun.
enjoy................................... .....................................gra ham

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