Thread: 71 Ford truck 460 timing

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vacume line is on the correct port for the ford dist. unhook and plug the line when setting the timing- for a 1971 4* btc is listed, 10* for most other years---starting around mid 70s they retarted the camshaft 8* and advancing it back up will help--when they lowered the compression and did all the smog stuff the econ went to hell but advancing the cam, more timing and possibly going to 68 - 70 jets in the primaries will help performance---It isn't a 4 wheel drive is it???

Originally Posted by jerry clayton

vacume line is on the correct port for the ford dist. unhook and plug the line when setting the timing- for a 1971 4* btc is listed, 10* for most other years---starting around mid 70s they retarted the camshaft 8* and advancing it back up will help--when they lowered the compression and did all the smog stuff the econ went to hell but advancing the cam, more timing and possibly going to 68 - 70 jets in the primaries will help performance---It isn't a 4 wheel drive is it???

I do agree with the later '70s retarded camshaft in early 460's. It does entail a front of the engine tear down and a new pair of timing gears and new chain - which if it has over 50K miles, probably needs anyhow as the OEM's are 'silent nylon'. From doing that mod to a '76 F250 and a '79 F350, I can assure you that it does make a difference in gas mileage and even better, performance. Set the timing then at 9-10 deg BTDC. Also, trash that bitty 475/525 cfm OEM carb for something that has some venturi area so it can breathe a bit better - the mid to late '70's heads aren't the best

Originally Posted by IC2

I do agree with the later '70s retarded camshaft in early 460's. It does entail a front of the engine tear down and a new pair of timing gears and new chain - which if it has over 50K miles, probably needs anyhow as the OEM's are 'silent nylon'. From doing that mod to a '76 F250 and a '79 F350, I can assure you that it does make a difference in gas mileage and even better, performance. Set the timing then at 9-10 deg BTDC. Also, trash that bitty 475/525 cfm OEM carb for something that has some venturi area so it can breathe a bit better - the mid to late '70's heads aren't the best

The carb is a holley 3310 750 cfm

Originally Posted by hellcruzer

The carb is a holley 3310 750 cfm

...which, of course on a stock engine is too big. My '79 ran with the early 780 cfm version of the 3310 on a 10,000 mile cross country trip and it went from poor gas mileage to beyond horrible. I had several different Holleys on after that, but what ran the best - a 600cfm Edelbrock. I would probably opt for the 650 they sell now instead.

Originally Posted by IC2

...which, of course on a stock engine is too big. My '79 ran with the early 780 cfm version of the 3310 on a 10,000 mile cross country trip and it went from poor gas mileage to beyond horrible. I had several different Holleys on after that, but what ran the best - a 600cfm Edelbrock. I would probably opt for the 650 they sell now instead.

It could be a 780 cfm version. The seller of the pickup told me it could be a 780. How to pump up an old Holley by installing a ProForm carburetor main body, the Proform 67101C? Have you heard anything about this?

I may be way wrong, but doesn't your cam also dictate your timing? My cam card came with specs.

Originally Posted by jerry clayton

vacume line is on the correct port for the ford dist. unhook and plug the line when setting the timing- for a 1971 4* btc is listed, 10* for most other years---starting around mid 70s they retarted the camshaft 8* and advancing it back up will help--when they lowered the compression and did all the smog stuff the econ went to hell but advancing the cam, more timing and possibly going to 68 - 70 jets in the primaries will help performance---It isn't a 4 wheel drive is it???

No it's a 2 wheel drive