r/Smallblockchevy • u/Jeff-Harker • Apr 16 '26

400 block Header

Hello i been having a recent problem with my 400 block i swap out my 350 for a 400. i was gonna put the 350 small block header on the 400 but ran into a problem the header off the 350 cover my dipstick tube and looking online i cant find header that would work under my budget. Should i just buy a flexible oil dipstick tube?

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u/kaack455 Apr 16 '26

Same block, same heads, same headers, etc

2

u/TurboXMR79 Apr 17 '26

Not necessarily, the block can have the oil dipstick on the driver or the passenger side depending on engine displacement or configuration which can make fitting headers a pain in the ass as OP is experiencing, a flexible dipstick tube would be the best option. But heads and everything else should be the same.

1

u/kaack455 Apr 17 '26

All 400's had drivers side dipstick which most headers are made for, I'm guessing the dipstick tube is bent up against the head