need info to verify motor
03-20-2008, 07:59 PM
#1
Thread Starter
Join Date: Aug 2007
Posts: 18
need info to verify motor
bought a '65 with a '68 302. is supposed to be a 4 bbl 302, ie 10 to 1 comp. how and where can I verify this without breaking down the motor. it only has 14000 miles and is averaging 160psi per cyl. did the 302/230 have different heads than the 302/210.
03-20-2008, 08:10 PM
#3
1st Gear Member
Join Date: Mar 2007
Location: Kiss-my-assvill florida
Posts: 149
RE: need info to verify motor
tell my the vin numbers on the block!! there at the top of the block in the backby the back of theIntakeManifold!it sould have aF or a J in the vin!! F for 2brl and J for 4brl
03-23-2008, 12:48 AM
#9
6th Gear Member
Join Date: Jan 2007
Location: AR
Posts: 5,469
RE: need info to verify motor
The short answer to your question is "NO"...
Unless you know what components were used in the rebuild, it is basically impossible to determine the compression ratio with any certainty without pulling off a cylinder head.
You will probably be able to guesstimate the CR with reasonable probability by knowing theoriginal chamber size of the heads on the engine now, and assuming that more or less stock cc pistons were used in the engine...
Some variable to consider might be:
Head gaskets, these canactually create an appreciable (not really "large" but appreciable)amount of CR change.
The size of the combustion chamber in the head (I know,,, duh!!)
If the heads have been milled.
If the block has been decked.
The size of the piston dish or dome.
Overbores will effect CR a little...
And probably something I am missing right now...
So there are a few big things that will effect C\R and lots of small things. The majority of these things can not be determined with certainty unless the head is pulled...
In any case, I say if the engine runs well, don't worry about it much,,, just drive it!!
Unless you know what components were used in the rebuild, it is basically impossible to determine the compression ratio with any certainty without pulling off a cylinder head.
You will probably be able to guesstimate the CR with reasonable probability by knowing theoriginal chamber size of the heads on the engine now, and assuming that more or less stock cc pistons were used in the engine...
Some variable to consider might be:
Head gaskets, these canactually create an appreciable (not really "large" but appreciable)amount of CR change.
The size of the combustion chamber in the head (I know,,, duh!!)
If the heads have been milled.
If the block has been decked.
The size of the piston dish or dome.
Overbores will effect CR a little...
And probably something I am missing right now...
So there are a few big things that will effect C\R and lots of small things. The majority of these things can not be determined with certainty unless the head is pulled...
In any case, I say if the engine runs well, don't worry about it much,,, just drive it!!
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