If you are running tall valve covers, you need to order headers for tall valve covers or call and let us know so we can move the pipes further out from the engine. GM 4.3L, Small Block Chevy, Small Block Mopar, Big Block Mopar, Small Block Ford, and Big Block Ford headers are tall valve cover by default.
If your car has a large brake booster, you may need to get the Forward Off-Set style headers or remove the booster.
Trucks may need to get the Forward Off-Set style headers due to the engine sitting further back in the engine compartment.
We make headers to fit engines and may not fit in all applications without modifications.
Bigger is not always better. Pipe that is too large will rob power from your engine and increase fuel consumption.