Problem after Gear Swap

D Styron · 06-28-2011, 01:51 PM

I have a problem that occurred after a gear swap. To start off with the car is a 79 fox body with a fuel injected 302 (stock cam, w/ headers) , aod (no stall) and now 4:10 gears. It is a street car that is bracket raced some. It runs mid 13's. With street tires on the street I can floor it and it will run up to 5500 and shift fine through all gears, when I put the Drag radials on at the track around 5000 or so, it feels like the engine just cuts out completely, I let off slightly, let the rpm's drop, engine picks back up and goes great untill 5000 or so again. It does not do this at all on the street. It had stock gears in it (3.08 I think) and it did not do this, put 4:10's in it and it acts up. What is also weird the 60 ft times did not change with the gear change, 2.02-2.04. I am thinking maybe valve springs are weak and I am spinning slightly on the street. It also doesn't feel like the valves are floating, but maybe they are. Just looking for some input. It does have 1.7 rocker arms.
Thanks,
David

06-28-2011, 01:51 PM	#1
D Styron Junior Member Join Date: Nov 2003 Location: Houston Posts: 25 Likes: 0 Liked 0 Times in 0 Posts	Problem after Gear Swap I have a problem that occurred after a gear swap. To start off with the car is a 79 fox body with a fuel injected 302 (stock cam, w/ headers) , aod (no stall) and now 4:10 gears. It is a street car that is bracket raced some. It runs mid 13's. With street tires on the street I can floor it and it will run up to 5500 and shift fine through all gears, when I put the Drag radials on at the track around 5000 or so, it feels like the engine just cuts out completely, I let off slightly, let the rpm's drop, engine picks back up and goes great untill 5000 or so again. It does not do this at all on the street. It had stock gears in it (3.08 I think) and it did not do this, put 4:10's in it and it acts up. What is also weird the 60 ft times did not change with the gear change, 2.02-2.04. I am thinking maybe valve springs are weak and I am spinning slightly on the street. It also doesn't feel like the valves are floating, but maybe they are. Just looking for some input. It does have 1.7 rocker arms. Thanks, David