351W questions
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Junior User
Joined: May 2005
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From: Apopka Florida
351W questions
Hi, I'm new to this site and need some help with making some decisions. I have a 351w with almost 200k on it. I've given it a tune-up and added a K&N airfilter kit. The engine runs good but I don't really know how much is left in this engine. I want to increase my HP but don't know if it's worth sinking alot of $$ into.
Postmaster
Joined: Aug 2004
Posts: 4,004
Likes: 1
From: North of Boston MA
Originally Posted by treading
Hi, I'm new to this site and need some help with making some decisions. I have a 351w with almost 200k on it. I've given it a tune-up and added a K&N airfilter kit. The engine runs good but I don't really know how much is left in this engine. I want to increase my HP but don't know if it's worth sinking alot of $$ into.
Rather than trying to increase the HP of that motor, a stock rebuild might give you more bang for your buck. You will have a nice, tight motor and then as $$ becomes available start to modify that.
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Yes, the compression and oil pressure test are both good indicators.
If the compression is 150psi+ than it's good (also want all cylinder #'s to be close)...
With the oil pressure, you want to find out what psi you get when the engine is warm and idling. It should be between 40-60 psi...what most people will see on an old engine, is that the pressure is good at idle when it's cold, but when it warms up the PSI goes down, eventually to 0. I see most people going by 20 psi or higher as an indication of it being satisfactory.
Most likely, a 200k mile engine will be lower than the numbers above, but you never know until you test.
If the compression is 150psi+ than it's good (also want all cylinder #'s to be close)...
With the oil pressure, you want to find out what psi you get when the engine is warm and idling. It should be between 40-60 psi...what most people will see on an old engine, is that the pressure is good at idle when it's cold, but when it warms up the PSI goes down, eventually to 0. I see most people going by 20 psi or higher as an indication of it being satisfactory.
Most likely, a 200k mile engine will be lower than the numbers above, but you never know until you test.
