302 timing query !!!
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New User
Joined: May 2005
Posts: 24
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From: UK
302 timing query !!!
hi every body ,
i have just built a new engine for my 74 f100, its a 302 bored out to 312, with edelbrock manifold and matching 600 carb , melling oil pump , crane lifters and a crane cam 364381.the engine is running great with loads more torque and power than the old block which is what i wanted ,my problem is that there are no timing pointers on the engine ,so i am timing it up by using the centre of a bolt hole on the side of the engine behind where the fuel pump is located but the idle is lets say unusual !!! very lumpy, and has a flat spot when warm just of idle.
is this where the timing pointer should ? and what should i set the timing to , currently its at 10 btdc any help would be great .
i have just built a new engine for my 74 f100, its a 302 bored out to 312, with edelbrock manifold and matching 600 carb , melling oil pump , crane lifters and a crane cam 364381.the engine is running great with loads more torque and power than the old block which is what i wanted ,my problem is that there are no timing pointers on the engine ,so i am timing it up by using the centre of a bolt hole on the side of the engine behind where the fuel pump is located but the idle is lets say unusual !!! very lumpy, and has a flat spot when warm just of idle.
is this where the timing pointer should ? and what should i set the timing to , currently its at 10 btdc any help would be great .
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
It doesn't matter what you use as a timing reference as long as it's the same every time. You could bend up a piece of coat hanger for a pointer and mount it with that bolt you are currently using.
The flat spot just off idle is either a vacuum leak or intake leak under the carb.
The flat spot just off idle is either a vacuum leak or intake leak under the carb.
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
My truck don't have one either...here is what I did....
remove #1 plug and bring the piston all the way to the top, put a screwdriver in the plug hole and use it to feel the piston. You have to work the crank back and forth until you feel it is right at TDC.
know get a white paint marker and put a mark on the timing cover and one on the balancer, it don't matter were as long as they line up and you can see it.
set the timing light to whatever you need at idle and then start it up and line the marks up. I set my light at 36* then rev the motor to where the timings is at full advance 3000rpms or so and them line the marks up. but you need a adjustable light to do it this way.
remove #1 plug and bring the piston all the way to the top, put a screwdriver in the plug hole and use it to feel the piston. You have to work the crank back and forth until you feel it is right at TDC.
know get a white paint marker and put a mark on the timing cover and one on the balancer, it don't matter were as long as they line up and you can see it.
set the timing light to whatever you need at idle and then start it up and line the marks up. I set my light at 36* then rev the motor to where the timings is at full advance 3000rpms or so and them line the marks up. but you need a adjustable light to do it this way.
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
those edelbrock crabs seem to have a flat stop off idle, at least all the ones i tried on my truck. try using the different holes made into the acc. pump linkage. mine liked the last hole closest to the pivit........
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
Or you could just do as mentioned with the spark plug/screwdriver method to find TDC, then mark on the timing cover where it says TDC on the balancer, then mark 10-12* advanced on the balancer, and you can use a conventional timing light, just line up the two marks by adjusting the timing.
