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Username Post: Cylinder head id        (Topic#348145)
Posts: 572
Reg: 01-01-08
11-10-17 05:27 PM - Post#2713955    

Having a hard time identifying a cylinder head on a 307 block. The number is 8817369 qith a date code (?) of 235. The ends seem to have no symbol. Made in Mexico. Any help is appreciated.


Edited by OL55 on 11-10-17 05:28 PM. Reason for edit: No reason given.


Frequent Contributor
Posts: 1421

Loc: Lake George, NY
Reg: 11-11-15
11-11-17 06:20 PM - Post#2714066    
    In response to OL55

Based on those numbers, nothing listed on the net.

Frequent Contributor
Posts: 1326

Loc: Burlington , Mass
Reg: 03-01-05
11-12-17 06:27 AM - Post#2714112    
    In response to Shepherd

Cylinder Heads
The 307 used one of three cylinder heads -- casting numbers 3927185, 3986338 and 3998991. Casting numbers 3927185 an 3986338 are early low-rpm torque makers with 70-cc combustion chambers, 1.72-inch intake and 1.5-inch exhaust valves. Chevrolet used the 3998991 from 1970 to 1976, and it was identical to the other heads except for its larger 74.56-cc combustion chamber


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