Another Set Back
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Tuned
Joined: Sep 2001
Posts: 279
Likes: 0
From: Western PA
Another Set Back
I bought this 1966 truck that was all souped up. I had a mechanic remove the "race" cam and install an EDLEBROCK stock cam. He did it outside and shut the hood at night. Well I put it back in the garage at home and didnt get to it till lately. When I changed the motor oil some water came out. When I got it started there is smoke coming from the driver side exhaust (intake gasket bad?) and smoke coming from the breather cap (never did that before). So I chacked compression and they all got 195 - 205 pounds of compression except one that has 160 pounds. Mechanic says that is too much compression for the street and wants to pull motor and put different pistons in. What does "high" compression do in a street vechicle?
Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
Causes you to spend more in fuel prices at the pump. If you can even find a fuel with a high enough octane to run in your truck. You might be better off placing and ad to swap with someone. So much easier then tearing a perfectly good engine down. Besides I am sure there are quite a few people who would want what you have under your hood if they swap a rebuilt stock engine for yours.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
JC, I agree with Mark, There are a lot of guys that want engines like you have.
I have seen 360s go for as little as $50.00, find one and build yourself a 390 just like you want it.
my 2
John
I have seen 360s go for as little as $50.00, find one and build yourself a 390 just like you want it.
my 2
John
Thread Starter
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Tuned
Joined: Sep 2001
Posts: 279
Likes: 0
From: Western PA
I got out the receipts that came with motor and the 352 motor was bored .040 oversize and 390 rods were installed and TRW flattop pistons. Any idea what the compression ratio would be?
Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
There are a lot of variables to what your asking. If you have the part # for the pistons then we can start getting to the nitty gritty. The head type would also help but we can round about the cc's of the compression chambers. If you download the compression ratio simulator in the "tech section", all the way at the bottom of the page, you can see what #'s you are going to need. To answer your question of will the gasket thickness affect the CR, it will but not as much as you need it too, only .5 at the most. Get the info you need from the simulator and start to gather the info you do have and we should be able to come up with the rest of it for you with a little research. Also post some of the questions you have in the FE engine section.
Thread Starter
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Tuned
Joined: Sep 2001
Posts: 279
Likes: 0
From: Western PA
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Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
It would seem that with shorter rods and compression height that it would have less CR? Unless they also put the 390 crank in. Just a thought.Putt
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