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#1
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help ID edelbrock heads
I just bought a pair of edelbrock heads 87cc, how can I ID if this are early or later style, I need to buy ARP head bolts and want make sure I buy the right ones. Here are some pictures. Thanks everyone.
Last edited by 69FIREBIRD76MM; 03-03-2016 at 12:43 AM. |
#2
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End head bolt holes (under valve cover) are sunk down on the early heads. Looks like you have the late ones.
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#3
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Just curious, what were the numbers stamped into the head on the last picture?
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#4
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I have no idea. It has more numbers and letters stamped . The seller couldn't tell much about them. Just that they were set up for hyd. roller cam, and the ports look like they were cleaned up. The intake ports measure 2.20"x1.19, looks like the felpro #1233 gaskets fits right on.
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#5
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Those are an exemption order number, ie. EPA number registered in CA to certify those heads as an EPA certified replacement head that will not alter CA's specific emissions laws. Has no real practical meaning other than to make them legal for sale in CA and costing Edelbrock approx. 20K per part number for the exemption.
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#6
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That's probably the co. and work order number.
I was wondering about these... |
#7
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Quote:
D7347 |
#8
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For sure you have the later style heads, First run and second run E-Heads had the "submerged in oil" end bolt holes (like a factory pontiac Head). (Head bolt head is down inside the end hole casting).
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#9
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I'm curios why they changed them Tom, I had a set of the early heads and I never ran into any issues.
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#10
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Commonality of the head bolts in fewer places was what I was told.
Instead of unique fasteners in more places, The lengths of the later heads is: Twelve 4.25" long head bolts Four 4.00" long head bolts Four 2.25" long head bolts That means that all 5 bolts (under the Valve Cover) are the same. http://arpinstructions.com/instructions/190-3605.pdf The early reads required extra machining operations by Edelbrock for the deeper pocket (early) head bolt locations, 4 different head bolt lengths vs 3 head bolt lengths, etc. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#11
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Quote:
We have not had any obstacles with the original design heads that weren't easily solved. However I really wish they would have designed them to work with 1.65 rockers without modification. EHTTFMF! Last edited by PAUL K; 03-04-2016 at 04:56 PM. |
#12
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Thanks guys, now that you mention it I did have to helicoil one hole because I screwed up and used the wrong bolt.
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