Hey guys I'm currently restoring a friends 77 f150 and i ran into a problem with the headers i ordered. I went to bolt them on and the drivers side hits the 4x4 housing. i later found out that the truck had a 400 not a 351w. looked at the directions and they say that they will fit a 400 also. they say that it will fit 4x4 and 2 wheel drive models. so in theory these headers should fit. now the instructions say i may need to lower the froth axle and attach headers and then re attach the front axle etc. Is this true? is there a better way? possibly shorty headers? sounds like alot of headache and i have been pushing this truck in and out of my garage daily to do body work in the sun and it is frustrating when the truck has a brand new motor i cant start due to no exhaust. any advice is appreciated thanks. BTW the headers are flow tech. I know there cheap but so is the guy footing the bill.

 

a 351w is a small block and a 351m and 400 is a big block... i didnt think the exhaust ports where even close, the springs may be sagging but just pick the truck up by the frame and it should give ya several inches

 

honestly something has to be messed up. i have a 77 150 with a 460 and full size headers that are flow tech and bolted right up even though its a 4x4. so i guess do what the last guy said and try lifting it up to get em on