Help!!
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Joined: Apr 2021
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Help!!
I've got a 351w in a 70F100. Fresh motor from builder. 600 Holley double pumper and MSD distributor. Also has 302 heads on it cause the valve train was better than the stock 351. When I floor it, backfires, but doesn't die. If I roll into it slow, it revs fine. Engine builder thought too much carb. I put a 600 Edelbrock on it last night. Same thing. It had after market HEI on it. Swapped it for MSD cause I thought it was causing the backfire and it didn't seem to stay timed.
Tuned
Joined: Aug 2019
Posts: 285
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From: SE Texas
I have a similar setup (351w, 570 Holley, Full MSD ignition) but mine runs great. You definitely have a tuning issue and I would start first using a vacuum gauge to get everything set up. You no longer have a stock setup so the Ford manual is a good starting point but not the final word. Check YouTube for videos on tuning using a vacuum gauge. They are inexpensive but indespencable for tuning a non-stock setup.
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I have a similar setup (351w, 570 Holley, Full MSD ignition) but mine runs great. You definitely have a tuning issue and I would start first using a vacuum gauge to get everything set up. You no longer have a stock setup so the Ford manual is a good starting point but not the final word. Check YouTube for videos on tuning using a vacuum gauge. They are inexpensive but indespencable for tuning a non-stock setup.
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Sorry I took so long to get back here. Issue was firing order. Hydraulic flat tappet cam. I needed to use the 302 flat tappet cam firing order. Ran great for 20 miles. Distributor gear got eaten, along with 2 bent pushrods. I'm on third MSD distributor. The one that got eaten, the replacement one with ring terminals that made me go huh? And finally one that had all the stickers, catalogs and stuff. Now it rattles.
Logistics Pro
Joined: Mar 2009
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From: Minnesota
The reason the gears are getting eaten is most likely wrong gear type. You have to match the gear to the cam. Some cams require a broken gear where other want a a cast one. The only other thing that might cause it is a bad oil pump. I would look at the cam specs and see what it says to run.
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Wrong gear material is one reason. Distributor not fully seated is another. I've talked to my builder, out comes my motor to get checked out before I grenade a rod through the block. Better safe than sorry! The gear that got trashed should have been cast iron to go with the flat tappet cam. I've got some phone calls to make to get things sorted out.
Logistics Pro
Joined: Mar 2009
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From: Minnesota
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Joined: Mar 2013
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From: Phoenix, Az.
just because it is a flat tappet cam doesn't necessarily mean it requires a cast iron gear. What the cam is made out of makes the difference. If it is steel then it needs a steel or bronze gear. If it is cast iron (like stock) then you should run a cast iron or bronze gear. Bronze will work for both but wears a bit faster. Sounds like your cam is steel.
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