Author Topic: NOS Engine  (Read 1646 times)

z28z11

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Re: NOS Engine
« Reply #30 on: June 01, 2018, 01:51:25 AM »
Something I did not know. Is this a way we could identify a 302 assembled? With or without the balancer on. Maybe post some pics.

Better way to guess is the flywheel flange of the crank - easy to see even with the pan on, front cover on, balancer could be installed, too; flywheel flange notch is specific to the 1178 Z28 forging. Very easy to identify at a glance -

Regards,
Steve
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

Stingr69

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Re: NOS Engine
« Reply #31 on: June 01, 2018, 03:29:24 PM »
The dampener was bottoming out, either on the first main journal or the getting hung up on one of the keys. For some reason I though the balancer went all the way on, nearly being flush with the timing chain cover. I'm about 3/8" off the timing cover now. Its on as far as she'll go.

Next I'm going to install the water pump and pulley's to see how that lines up.

I'll measure the 350 and 302 cranks and see how they stack up.

Remove keys and try installing damper again to see if that was the issue.  If it goes in farther, you know the keys were the culprit.

The other possible issue is how far the bottom timing gear has been installed.  If gear is not on all the way, you will be too far out on the damper when it stops against the gear. That pushes the damper and pulleys out of alignment.  When your damper contacts the gear, thats the bottom.  One side of the gear has a relief for the radius on the crank but the other side of the gear typically does not.

Crank snout length is not the problem here. it does not play a part in this issue.

Dusk_Blue_Z

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Re: NOS Engine
« Reply #32 on: June 01, 2018, 10:36:33 PM »
you can tell I'm an amateur. Now that you mention the timing gear, that's probably the 0.5" difference I'm getting. Thanks.
1969 X77 01B 51 51 flat hood

Stingr69

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Re: NOS Engine
« Reply #33 on: June 02, 2018, 12:39:09 PM »
If the gear is not flush with the crank land, it is not on far enough. Be sure the beveled side of the gear bore is facing the inside of the engine.

Dusk_Blue_Z

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Re: NOS Engine
« Reply #34 on: June 02, 2018, 09:23:14 PM »
I mocked up the alternator, fan pulley, and installed the belt. Alignment looks great.

Can someone point me in the direction on how to remove the valve cover emblems?
1969 X77 01B 51 51 flat hood

Dusk_Blue_Z

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Re: NOS Engine
« Reply #35 on: June 25, 2018, 10:59:37 PM »
Thought I'd share an update to the crate engine LT-1. Today was dyno day and she produced 369hp (6k) and 368 torque (4300) in stock trim (sans exhaust manifolds). Pretty close to the factory ratings.

Sprung a few oil leaks, but was glad to see this one come alive.
1969 X77 01B 51 51 flat hood

Kelley W King

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Re: NOS Engine
« Reply #36 on: June 26, 2018, 11:58:08 AM »
I have always felt the GM guys did a good job with their HP engines. The LT1, L79, L78, ect. It just seems the factory heads ,intake, cam, and carb just work together well for power and streetability. Getting a little 302 to do what it does and still make a beer run is hard to beat.
69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition