History / OriginalityGot a question about 1982-1992 Camaro or Firebird history? Have a question about original parts, options, RPO codes, when something was available, or how to document your car? Those questions, answers, and much more!
Welcome to ThirdGen.org!
Welcome to ThirdGen.org.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!
I have found a set of heads in the house i just moved into. I cannot find any information on the casting number. 3870126. Seems to be from the 60's. Based on similat numbers I have found. Checked motech no luck. I am currently planning on an l05 build to put in my '89 ls. I just want to know if these heads are worth anything. They do seem to have bigger intake runners than the swirl ports. Any input?
My "standard catalog of Chevy casting #'s" does not show 3870126, but it does show
3970126 as as 69-72 350 truck and base passenger car. Measure the intake valves- most of them had small 1.72 valves, which are useless- if they have 1.94 valves, they are much more useable. You say you're building a L05, which is a truck TBI 350- is that so? IIRC, these heads have 74CC combustion chambers, which is WAY too big for a 305.
