tarafied1
Well-Known Member
I have been playing with the timing on the 429. It's 10.5:1 CR with a mild cam: Dur. @.050” 218/228, gross valve lift .509”. I run 93 octane pump gas. When the engine is warm and under a slight load it pings. So I was going to take out some of the vacuum advance. But first I wanted to check my base line.
I have a stock Ford Duraspark distributor. It was set at initial 14 degrees, and had the stock heavy springs that kept the mechanical advance from coming in quick. My damper only goes to 30 degrees BTC so I am guessing when I say total was upper 30's. The reluctor was the 15L/21L and was in the 15L side. That should mean 15x2=30 so at 14 initial and 30 degrees mechanical, I should have been at 44 total. It seamed to run okay but top end was noisy so I thought I would address that too.
So I took a reluctor from a 5.0 I had which was a 10L/13L. I put it in at 10L (10x2=20). I put in the silver springs which were supposed to be all in by 2800rpm. So I played with it and it liked as much as 18 degrees initial (with the reluctor set at 10L it should be 20+18 or 38 total). It's all in at 2000 rpm and looks like low 30's total. Not much past the 30 degree mark. Might need to flip it to the 13L side for more total.
I also turned the vacuum advance out two turns. Took it out for a spin and after it warmed up It felt just as strong as before on the bottom and now I can rev until I float the valve springs.
I think I will leave it this way for a while. Some day I might take to a test and tune night. With the old converter and the timing the way it was, I could only get it into the 13's. 60 foot times were bad. With the higher stall and recurved dizzy I would like to see where it's at. After the Bobcat is running I am pulling the C6 and putting in the TKO.
I have a stock Ford Duraspark distributor. It was set at initial 14 degrees, and had the stock heavy springs that kept the mechanical advance from coming in quick. My damper only goes to 30 degrees BTC so I am guessing when I say total was upper 30's. The reluctor was the 15L/21L and was in the 15L side. That should mean 15x2=30 so at 14 initial and 30 degrees mechanical, I should have been at 44 total. It seamed to run okay but top end was noisy so I thought I would address that too.
So I took a reluctor from a 5.0 I had which was a 10L/13L. I put it in at 10L (10x2=20). I put in the silver springs which were supposed to be all in by 2800rpm. So I played with it and it liked as much as 18 degrees initial (with the reluctor set at 10L it should be 20+18 or 38 total). It's all in at 2000 rpm and looks like low 30's total. Not much past the 30 degree mark. Might need to flip it to the 13L side for more total.
I also turned the vacuum advance out two turns. Took it out for a spin and after it warmed up It felt just as strong as before on the bottom and now I can rev until I float the valve springs.
I think I will leave it this way for a while. Some day I might take to a test and tune night. With the old converter and the timing the way it was, I could only get it into the 13's. 60 foot times were bad. With the higher stall and recurved dizzy I would like to see where it's at. After the Bobcat is running I am pulling the C6 and putting in the TKO.
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