Under rated 96-97 561 cylinder heads - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
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post #1 of 2 (permalink) Old 03-24-2019, 04:07 PM Thread Starter
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Join Date: Feb 2019
Location: Reno Nevada
Posts: 6
Under rated 96-97 561 cylinder heads

I have a theory .
I think my LT1 561 heads are Vortec.
They have intake runners moved up about a half inch pertruding top of head
with hollow bottom of port
Just like vortecs
bigger D port exaust runner .
No dog leg in intake port.
same as Cop car Iron LT1 heads
needs special intake manafold in 96-97
Others dont line up.
I think They got upgraded with the LT4 and Lt1 iron heads
And LS1s were over shadowing them
They also have fast burn chambers.
My 97 Z28 has been beating stock and built LS1s and two 2014 corvette stingrays wit 6.2 liter
450 horse power LT1s
With stock Hooker Superformance muffler a trick flow elbow and a 4 inch K&N Stock steel rockers
and cam.
And beat them by 10 car lengths.
Are the 561s Vortec ?
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post #2 of 2 (permalink) Old 03-25-2019, 01:00 AM Thread Starter
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Location: Reno Nevada
Posts: 6
Decided to put the horsepower on my almost stock 97 Camaro Z28 into the records LOL
even running a light cause of cheap rebuilt air sensor throwing a code 101 I think and having
a bad exaust manafold Leak .
Now my GTECH Performance Meter Pro Has always been within 1 horse power of the
tire Dyno and within a tenth in quarter mile ET at track So I headed for track
and no one was there .
You have to put in the weight Me in car full tank of gas we weigh on certified scale
3,644 pounds And put it in zeroed level THE whole tracks level
switch it on to far left put in pounds level box 2 test runs at half throttle
with box saying go and blinking hit 170 hp Twice Figured I was good to go with callabration.
Figured Id just hit the Afterburners and spin them Letting Them hook up hard
Went through 4th with all it had lett off it went blank for a second.
It read 691 Horse power.
I thought wow I must have messed up on the weight that time or something right.
So I turned around turned it off and on to far left its got to be on horse power .
It asked for weight I put in 3644 leveled it set it it was flashing go.
Positive I did every thing right, I gunned it.
When I hit fourth I blew it off windsheild and caught it in my hand .
And it was flashing 691 at me LOL
If you know anything about the little electronic dynos they are like a gps speedometer
always 1 off the tire dyno meaning 690.

and always accurate when set up right.
I new my car was fast Its beating every body by at least ten lengths in quarter.
Now I am more confused than ever.
I usually use the gtec on way to roller dino
Ive beaten two LS1s one built, camaro ss two stock 2014 vettes 6.2 liter LT1s 450 hp LAMBO
but I still think thats excessive
I was thinking 400 and out driving every body
Now Im wondering whats in the water?LOL
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