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"SOHC" Means Single Over head Cam and DOHC means Dual (2) Over Head Cam. Example: on lately Ford Mustangs , It comes with 4.6L SOHC and DOHC Engines, which basically it will tell you whether there is/are 1 or 2 camshafts over each cylinder head.
SOHC non-vtec
i have a 2000 ford focus. it has a sohc it is blown and a dohc is so much cheaper what does it take to change the engine for a dual over head to work?
Generally, it is only possible to convert a SOHC engine to DOHC is if there is a DOHC version of that engine that uses a DOHC head on the same block as the SOHC version. However, there may be other complications here. For instance, if the SOHC head is a two valve head and the DOHC head is a four valve head, it will probably be necessary to upgrade your pistons so that you have sufficient valve reliefs for four valves. Otherwise, a piston to valve collision could result. In most cases, a better idea is to do a full engine swap to a DOHC engine. This way, you don't have to worry about such things as the availability of a DOHC head for your block or piston valve reliefs. Also, in most cases, a full engine swap is often cheaper, simpler, and necessary to be emissions compliant (if this is a concern where you live).
i cant tell how to find out its a eci 3000
No
SOHC
is it DOHC or SOHC 2 overhead cams or 1 if they are the same DOHC or SOHC then yes most years will fit and 99 and 98 will absolutely fit
It depends. If there is a DOHC engine available that uses the same bottom end as your SOHC engine, then you can use that DOHC head. Just make sure that there are sufficient valve cutouts on the pistons. If there ISN'T a DOHC head available for your block, then a full engine swap would be a better idea. But even if there is, a full engine swap may be a better and more cost-effective option.
Sohc
SOHC--Single OverHead Cam DOHC -- Dual OverHead Cam