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L78 horsepower
Made our first dyno run on the L78 engine for my 67 Camaro. It's bone stock carb to pan. Generated 397hp at 5,500. Was running a little lean, so re-jetting tonight and run again tomorrow. Anyone have input on what HP a stock L78 should put out?
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#2
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Was the session with headers or exhaust manifolds? Ours with a little lower compression made 450 with the shops carb, headers and dist. but almost 70 less with the stock carb and distributer.
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The answer is.... has Eric laid his hands on it or not!!
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Sam... |
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Mine made 420 with shop headers but, was not "dialed in" all the way
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69 Chevelle SS L88 "Day-2" Lemans Blue 69 Chevelle SS L34 postsedan project-Azure Turquoise |
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How much do you think headers add over manifolds? Eric is gonna build my 402 for me and I am going back and forth. It's in my Monte Carlo.
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Eric did the carb. Ran on dyno with headers, stock dist and carb.
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#7
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Seems impressive to me. Was max HP at 5500? Seems to me there would had been a little more runway left for more HP?
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65 Corvette Coupe L78 67 427/390 Vette Coupe unrestored 67 L-79 Vette roadster (Top Flight) 69 L71 Roadster Survivor 69 L46 Roadster Survivor (Sold) 69 Z/28 RS 69 Dodge Charger R/T 70 W30 442 Auto Air Survivor 2016 Z06 Coupe M7 70 AAR Cuda (Sold) 69 L78 Chevelle |
#8
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Should take roughly a 74 primary jet with headers on the dyno, will want the 71 with manifolds in the car. Secondary jetting should be good as is.
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#9
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L78 Horsepower..
When the L78 was introduced in 1965 it was rated at 425hp...this was based on 6400 rpm's...almost 1,000 rpm lower than the engine being discussed. Most folks would agree that the later 375hp rating was low...headers, properly tuned distributor/carb and blueprinted assembly all make a huge difference.
Last one we did was a 70 402 version...pancake intake, Eric prepared 4492 and run thru headers...it made north of 430hp. Again, the real power difference in these motors is in the details. -wilma
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro |
The Following User Says Thank You to WILMASBOYL78 For This Useful Post: | ||
ORIGLS6 (10-15-2017) |
#10
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My 69 L78 was just a basic build,trw pistons,bullet stock spec camshaft,it was balanced.heads are stock 840 castings.with headers it made 415@5500 and 400ft lbs from 2000 to 5500. My nova ran a 13.02 off the trailer at scr with headers 4.10's and street tires
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1967 SS427 4 speed triple black survivor-sold to a good home 1969 nova SS396 L78 4 speed triple black survivor 1970 camaro SS350 citrus green,Dad bought it new! 1968 chevelle ss396 L34 M21 KK rear all born with 1972 formula 400 M22 |
The Following User Says Thank You to cwc For This Useful Post: | ||
ss396fan (10-15-2017) |
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