427 impala

[442w30]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Big Block Bill</div><div class="ubbcode-body">

Other than induction (3 X 2 vs. 4 Barrel Holley)all the internal parts are the same for a L-71 &amp; a L-72 Big Block I thought.

Bill
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Yeah, but it's still an incorrect claim. He'd have a whole lot more credibility if he said it was the same engine as the L72 Vette from 1966 and the COPO Camaro frmo 1969. :twocents:

I actually owned a L72 66 vette back in the day. From what I have learned present day the engines were the same except for casting # head casting # and a few other not important #'s. I always thought the 427-435 was the L88, and as such would not even be close to the L-72......?

[Big Block Bill]

The L-72 engine in a any Chevrolet 1966 to 1969 was the same: internal compression, head configuration (rectangle port / combustion chamber rating) as any year L-71 Corvette engine. The only thing that changed from 1966 to 1969 was casting numbers of the block &amp; cylinder heads, drilled holes ect. for sending units &amp; accessories.


In 1966 &amp; most early 1967 engines, the camshaft had the &quot;Groove&quot; in the back for oiling reasons and they will not interchange with the later non-grooved camshaft. The specs. of the camshaft I believe are identical. That's what I remember.

Bill