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#1
04-09-2010, 01:29 PM
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Re: Question on '65 L78 vs. later L78s
[ QUOTE ]
Didn't the Z16 engines have a hydraulic cam. Other than that I understood that they were basically the same. Any other differences probably had little effect on hp output. [/ QUOTE ] That is correct, if memory serves me, it wasn't coded L78 either. Steve
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Steve 
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#2
04-09-2010, 05:08 PM
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Re: Question on '65 L78 vs. later L78s
[ QUOTE ]
[ QUOTE ] Didn't the Z16 engines have a hydraulic cam. Other than that I understood that they were basically the same. Any other differences probably had little effect on hp output. [/ QUOTE ] That is correct, if memory serves me, it wasn't coded L78 either. Steve [/ QUOTE ] They were the L37...Suffix IX..  ~ Pete
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I like real cars best...especially the REAL real ones!
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#4
04-09-2010, 11:46 PM
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Re: Question on '65 L78 vs. later L78s
The only difference I know is the 65 block has no oil groove in the back cam journal. The 65 cam has a groove all around the back journal. The 66 doesn't. The 961 was the 2-bolt and the 962 was the 4-bolt for both 65 & 66. The chevelle vette and Imp all used the same intake the 963. The carbs were the same cfm, just diff. #s. The heads 208 & 858s same valves 2.19/1.72 and same size combustion chambers 108.989.
Piston weight was diff 24.00 oz. to the 66 piston 23.13 oz. I don't know of any differance between them. That's my story and I am going to stick with it!!! 
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#6
04-10-2010, 01:01 AM
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Re: Question on '65 L78 vs. later L78s
Here's what 396/427 Chevelle/Camaro ex manifolds look like.
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...................... John Brown This isn't rocket surgery.....
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#7
04-10-2010, 01:04 AM
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Re: Question on '65 L78 vs. later L78s
These are the style used on 65 and 66 Impala, Bel Air and Biscayne 396 425 hp and 427 425 hp engines. These are the same style used on 65 thru 69 396 and 427 Corvettes.
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...................... John Brown This isn't rocket surgery.....
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#9
04-10-2010, 05:09 AM
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Re: Question on '65 L78 vs. later L78s
65/66 L78
Same block, bore, crank... Different pistons, Cam, heads, intake, carb, distributor, and exhaust manifolds In Aug of 65, GM rated the 66 L78 at 425 and 6200rpm. Rating was later dropped to 375 at 5600rpm. Jack Douglass Chevrolet actually received shipment of 25 or so 425hp rated 66 L78. Same motor, just a different rating at a different RPM. Documented 425hp rated 66 L78 are known to still be around.
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