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#1
06-30-2008, 03:34 PM
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Re: L-78 Motor and auto trans
The block is an 854 (402)which is actually a 70 P/N but was used very late in the 69 model year (most of 69 was a 272 p/n)That would explain the 291 and 840 head scenario
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70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55 71 Porsche 911 Targa 
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#3
07-02-2008, 09:33 PM
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Re: L-78 Motor and auto trans
Weren't the 840 heads a smaller exhaust valve (1.72) than a 291 head (1.88)?
If that were the case, as I think, then that motor with 2 different heads would be a little lopsided in power output from side to side. Probably not enough to notice though.
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Rick 69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.) 69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan  Don't text and drive. Somebody's life may depend on it!
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#4
07-02-2008, 10:55 PM
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Re: L-78 Motor and auto trans
I have 2 seperate MATCHED sets of 840/291 squuare port heads, both with late 1969 dates. I was just under the impression that they did this late in the 1969 model year? Am I wrong?
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Day 2 is Life.
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