Jun 142011
 

I have a 1981 Corvette, I have just put a new crate motor in the car. I have REMOVED the computer and because of this I had to change the carburator and distributor. here is a list on the motor parts:
350 cubic inches 4.00″ Bore, 3.47″ stroke
8.5:1 compression ratio
300 HP @ 5200 RPM
368 ft. lbs of torque @ 3700 RPM

Engine Consists of the following parts:
* Block- part# 10066034, casting# 10066036
* 2 piece rear mail seal 4 bolt main
* Crankshaft -part# 93426651, Nodular Iron 1985 and
older flywheel bolt pattern
* powdered metal Connecting rods- part# 10108688
* Cast Aluminum pistons- part# 93422884
* G.M. High Volume pump, oil pump part# 12555284
* Hydraulic Flat Tappet Camshaft, Intake Lift-.443″
Exhaust Lift-.465″ Intake duration @ .050 ” -214 Exhaust duration @
.050″-224, lobe seperation-112. This can has a mechanical fuel pump lobe.
* Edelbrock performer EPS intake manifold ( Which I
removed and put on the intake from the original motor)
* Cylinder heads- part # 93438649, 1.94″ intake
valve, 1.50″ exhaust valve, 76cc Combustion Chamber, 7 bolt style
exhaust flange standard, 1985 and prior intake manifold pattern.
Permeter bolt style Valve Covers. This head is very similar to the old
#882 castings from the 1970’s.
Here is what I am looking for: Suggested initial timing, rate of advance and total timing. The car now has a Q-jet 750 Stage 2 carburator. It has an automatic transmission. Can you PLEASE help me with this information. Thank you very much.

  2 Responses to “Corvette Timing”

  1. The cam is quite mild and thus I would start with the stock timing at 4 before TDC (Top Dead Center) and look for a total timing of around 32 to 36. I would advance the timing 2 degrees at a time untill you either here the engine ping or the rear tires brake loose easily then back it off 2 degrees. If the engine pings you can always incrfease your octane to all the ability to advance the timing more. But with your compression 87 octane will work just fine.

  2. Thank you VERY much for your help with my timing question. Have a great day.

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