Does anyone know that if I remove the intake manifold form a 327 engine wether or not I would be able to read a part number on the cam without removing the cam? Do cams have part numbers cast into them? What is the GM part number of the cam for a 375 HP fuel injected engine. Thanks in advance!!!
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Re: 327 cu.in. Engine 375 HP cam
You cannot see the cam from the valley of an engine. You would have to remove the cam. -
Re: 327 cu.in. Engine 375 HP cam
jim-----
After you remove the cam, the number that you're looking for is "3849347" or its derivative "9347". It will be found on the cast surface between lobes.In Appreciation of John HinckleyComment
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Addendum
By the way, finding this cam is NOT proof that an engine is an original L-84. The same cam was used on L-76 engines, too.In Appreciation of John HinckleyComment
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Re: 327 cu.in. Engine 375 HP cam
the lobe lift should be .323 for both intake and exhaust for a 3849346 cam. you can check this with a dial indicator. the chance of another cam having exactly the same lift on both lobe would be slim so if they measure .323 on both i would guess it is a 3849346 camComment
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Re: Addendum
Joe, Other then the engine stamp is there any other way to verify it is an L84, unless of course you dismantle the whole engine and check each part.Comment
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Re: Addendum
Jim-----
The engine pad suffix code is the ONLY way to verify if a particular engine was originally an L-84; all of the internal parts of the engine were the same for both L-76 and L-84.
Externally, there are some differences besides the obvious induction system differences. Exhaust manifolds evidenced some differences, etc. External components often get changed over the years, though.In Appreciation of John HinckleyComment
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Re: Addendum
If you are dealing with a '64-'65 L-84 375 HP FI engine, check the idle vacuum at 900-1000 RPM idle. It it's about 10", the engine probably has an original type 3849346 cam, which is known as the "30-30" cam.
DukeComment
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Re: Addendum
Can I check the vacuum off the back of the plenum where the plug is for what is normally used to hook to power brakes. Would a modern vacuum gauge work? ThanksComment
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Re: Addendum
Another tip off of the SHP/FI engine is the driver's exhaust manifold will be drilled to accept the choke heat tube and the passenger's side will not be drilled. Also the passenger side will have a spacer instead of an exhaust heat valve as the FI manifold doesn't have an exhaust heat crossoverComment
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Re: Addendum
The easiest way is probably to tee into the vacuum advance line with any kind of vacuum gage that you believe to be accurate. The vacuum advance must be connected to get a true idle vacuum reading. That's why you use a tee.
DukeComment
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