352 or 390?
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352 or 390?
I was told this truck had a 390 in it, and that it had been bored .030 over. I think I verified the bore work b/c I can see the pistons are stamped .030 on top. The front drivers side of the block is stamped with two numbers, 31 over 352. Does this mean this is a 352? If so, and it is bored .030 over, what would the cubic inches be roughly? My last question is whether or not it is worth spending any more money on this motor, or should I find a true 390(assuming this is not). Any info on this would be greatly appreciated. Thanks guys for helping out a new comer.
Post Fiend
Joined: Feb 2000
Posts: 5,130
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From: Brea CA
352 or 390?
If you can see the pistons, do you have the heads off?
If so, then just measure the bore diameter.
352 = 4.00 bore (standard)
360, 390 = 4.05 bore (standard)
With your 30-over pistons, add .03 to these numbers. Might want to measure the stroke too.
Barry
If so, then just measure the bore diameter.
352 = 4.00 bore (standard)
360, 390 = 4.05 bore (standard)
With your 30-over pistons, add .03 to these numbers. Might want to measure the stroke too.
Barry
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352 or 390?
So how do you tell the difference b/w a 352 and a 390? No,
I don't have the heads off but when piston #1 is TDC I can see
the .030 on it. I have noticed alot of the parts for these two engines
are exactly the same. Can somebody help me figure this out short of removing the heads and measuring the cylinder?
I don't have the heads off but when piston #1 is TDC I can see
the .030 on it. I have noticed alot of the parts for these two engines
are exactly the same. Can somebody help me figure this out short of removing the heads and measuring the cylinder?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
352 or 390?
jg, the easiest way is to measure the stroke. Drop a white jacketed wire through the spark plug hole. Have a bud turn the engine with a socket wrench while you mark the wire with a Sharpie. Measure the length of the mark and post it back here. We should be able to help then. 
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352 or 390?
The block is stamped C6ME-A(I think, it is hard to read). The heads are stamped C8AE-H. The intake is an Edelbrock aftermarket. I am trying to get my hands on someone to help me check the stroke length. Thanks for all your help.
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Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
352 or 390?
Run of the mill block, 68 heads were used on 360s & 390s. The measure will help.
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John
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Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
352 or 390?
3 1/2" stroke and 68 parts, looks likely you got a good ol 360.
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John
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In the cool still quiet of night, you can hear chevies rusting away.
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In the cool still quiet of night, you can hear chevies rusting away.
New User
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352 or 390?
ya i had the same problem but mine was a 360 with a 352 stamped on it. i found out there all the same blocks and the diffence between a 360 and a 390 was the stroke since they have the same bore and the 360 valves are actually bigger than the 390. i had my 360 bored .30 and stroked with 390 crank and rods. it has unbelievable power you have a good motor either way
Junior User
Joined: Sep 2002
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From: Monroe USA
352 or 390?
Sounds like exactly what I am doing... Right John? hehe :P
lata
CHRIS
>i had my 360 bored .30 and stroked with 390
>crank and rods. it has unbelievable power you have a good
>motor either way
lata
CHRIS
>i had my 360 bored .30 and stroked with 390
>crank and rods. it has unbelievable power you have a good
>motor either way
