Stock and hopped Z-28 engines here..
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Stock and hopped Z-28 engines here..
Just how much power did these little old engines really make?
I made a junk 301 that I figure was only like only 325 hp..So know a little bit about them.
pdq67
I made a junk 301 that I figure was only like only 325 hp..So know a little bit about them.
pdq67
Re: Stock and hopped Z-28 engines here..
Been a number of years but my mostly stock rebuilt 302 plus .030 over 68 Z/28 made about 351 HP on the dyno with no accessories, electric water pump used on dyno only and headers.
Re: Stock and hopped Z-28 engines here..
There was a hot rod mag article that covered just that about the 302 Z/28 engine . Dyno tests in both restored stock oem form and also when modern hot rodded (aftermarket heads, intake, roller cam, headers) I believe the all stock motior was 350 hp and the hot rodded version was 550-560 hp.. If memory serves. Do a search. It was online.
Re: Stock and hopped Z-28 engines here..
Stock ones from the dealer were not all that fast, maybe mid to low 14's ...
Motorcycle land speed racing... wearing animal hides and clinging to vibrating oily machines propelled by fire
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Re: Stock and hopped Z-28 engines here..
Have an old rag that tested the 69 Z/28 against the 69 boss 302 mustang. They claimed both cars ran identical 14.98.
Re: Stock and hopped Z-28 engines here..
YES
Racing a NA NHRA stocker should be mandatory before any posting.
Re: Stock and hopped Z-28 engines here..
Interesting article; roller cam, aftermarket heads, intake and carb and just about the HP output of a Stock Eliminator 302 SBC.
Have a friend building a ‘70 Boss 302 Stocker. Expecting north of 550 HP. Time will tell.
NHRA SS/G
1970 AMC AMX - 390 4-speed
Advanced Clutches - Red Line Racing Cams
1970 AMC AMX - 390 4-speed
Advanced Clutches - Red Line Racing Cams
Re: Stock and hopped Z-28 engines here..
A good SVRA spec vintage TRANS AM ford 302 and chevy 302 will both make 600+ HP and 420 TQ in road race trim. Iron heads (aftermarket allowed), dual plane intake, roller valvetrain, and 310 max cid. They also need to survive for hours with a brick on the gas pedal at 8 k rpm and survive the occasional 10 k rpm bad down shift.
Carlquist Competition Engines
Re: Stock and hopped Z-28 engines here..
All the people except for one guy I grew up with those 302's were torque dogs. Never wasted any time on them when a well build 400 SBC could make more power for less.
Re: Stock and hopped Z-28 engines here..
So how much power at the flywheel did the factory stock Z28 engine make as installed in the car on the factory assembly line?
Motorcycle land speed racing... wearing animal hides and clinging to vibrating oily machines propelled by fire
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Re: Stock and hopped Z-28 engines here..
Yeah pdq has some delusion that a short stroke is an advantage....
All it does is make the port look larger compared to the displacement.
Re: Stock and hopped Z-28 engines here..
You can know this by finding the 1/4 mile drag test MPH and the true test weight with driver of a all stock '67-'69 Z/28 Camaro.
EG: 290 hp net as installed rated power and #3500/ #3600 weight with driver goes 101-102 MPH 1/4 mi.
Last edited by F-BIRD'88 on Sun Oct 11, 2020 1:26 pm, edited 2 times in total.
Re: Stock and hopped Z-28 engines here..
Most people will not gear their car up high enough to fully use the high rpm power band of a small cid v8 like a 302.
They won't run the long duration cam nor the high rpm induction system needed . Especially on anything that gets street duty.. The powerband is pretty much 5000+ and up (8000-8500 rpm)