Timing marks with optispark delete plate
Thread Starter
Teching In
Joined: Mar 2012
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From: New Zealand
Timing marks with optispark delete plate Hi there
I'm swapping my old Gen 1 SBC for a LT1 into my landcruiser
I've got an LT1 carb manifold and are going to run my existing holly TBI and a HEI dist
I've got a Chevrolet Performance LT1/LT4 Front Cover Plug optispark delete 12367600 http://www.summitracing.com/int/part...7600/overview/ and Professional Products PowerForce Harmonic Dampers 80030 http://www.summitracing.com/int/part...0030/overview/
I haven't got a screw in piston stop to find TDC but I put a small screwdriver through No 1 plug hole and it looked like the piston came up TDC as the timing marks lined up, can anyone confirm the timing marks line up correctly for TDC as both components are aftermarket made by different manufacturers they aren't a combined kit
thanks for any help
I'm swapping my old Gen 1 SBC for a LT1 into my landcruiser
I've got an LT1 carb manifold and are going to run my existing holly TBI and a HEI dist
I've got a Chevrolet Performance LT1/LT4 Front Cover Plug optispark delete 12367600 http://www.summitracing.com/int/part...7600/overview/ and Professional Products PowerForce Harmonic Dampers 80030 http://www.summitracing.com/int/part...0030/overview/
I haven't got a screw in piston stop to find TDC but I put a small screwdriver through No 1 plug hole and it looked like the piston came up TDC as the timing marks lined up, can anyone confirm the timing marks line up correctly for TDC as both components are aftermarket made by different manufacturers they aren't a combined kit
thanks for any help
TECH Veteran
Joined: Apr 2008
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I am using the same parts for a LT1 into a 70 Nova. But using a ATI balancer for a B-body since that will line the accessory bracket up as that is also from a B-body
watch the #1 valves as you rotate the engine by hand. they are both closed when on compression stroke and #6 would have a valve open. Opposite when #6 is TDC on compression stroke
you can also screw in a compression gauge in #1 and watch it build pressure as you turn the motor by hand
watch the #1 valves as you rotate the engine by hand. they are both closed when on compression stroke and #6 would have a valve open. Opposite when #6 is TDC on compression stroke
you can also screw in a compression gauge in #1 and watch it build pressure as you turn the motor by hand
Thread Starter
Teching In
Joined: Mar 2012
Posts: 19
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From: New Zealand
thanks for the info mate, I can get No-1 up to roughly TDC but don't have a screw in piston stop or any other means of verifying exactly where the TDC point is. When I rotate the crank with a small screw driver through No-1 spark plug hole the piston seems to cycle TDC as the timing marks line up but I'm just hoping to get confirmation that the timing marks do line up correctly as the damper and blank off plate are both made by different manufacturers, the damper is keyed onto the crank so it can only go on one way, thanks for any help.
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the "pointer" part of TC adapter put the pointer where it would be on a Gen 1 SBC. It is really the same thing in terms of adjusting timing
Thread Starter
Teching In
Joined: Mar 2012
Posts: 19
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From: New Zealand
I made up a piston stop out of an old spark plug and a bit of rod and screwed that into No1 hole and rotated the crank clockwise until it stopped and marked the damper then rotated it anti clockwise and marked the damper where it stopped then found the halfway point between the 2 marks for tdc and it came up about 4 degrees retarded from where the factory marks start on the damper so I cut a new notch for my engines tdc
