[TAQuest]

Originally Posted by steve25

You do not have any issues to look for in regards to the springs on those heads limiting the motors rpm if it will rev passed 3200 out of gear so stop going back and bringing that up.

It will not free rev correctly past 3200 either.

[TAQuest]

Let me run this past you;

I looked at the installation instructions for the comp cams roller rockers. When adjusting you spin the push rod until you feel resistance then go another half turn. So I tried to spin the push rods and they spin fairly easily on the ones where the valves are closed. Could it be that the nuts were not tightened down enough?

[TAQuest]

My question is;

After you put that extra half turn on them do they still spin easily with your fingers?

[steve25]

No, loose rocker adjustment(s) will not cause the motor not rev,it might have a noisy valvetrain, but not stop it from Reving,but too tight may!

What is your timing doing at 3200 rpm, is it stable, and what is it at up at 3200 rpm, 36 degrees like you posted?

I would at this point also confirm TDC on the Balancer if you have not done so yet.

[TAQuest]

Originally Posted by steve25

No, loose rocker adjustment(s) will not cause the motor not rev,it might have a noisy valvetrain, but not stop it from Reving,but too tight may!

What is your timing doing at 3200 rpm, is it stable, and what is it at up at 3200 rpm, 36 degrees like you posted?

It's gradually advancing like it's supposed to. Seems stable. Not getting any spark knock until I advance it too far(on the test drive).

["QUICK-SILVER"]

Originally Posted by TAQuest

My question is;

After you put that extra half turn on them do they still spin easily with your fingers?

Depends on how fast the lifter bleeds down. After bleed down it will spin just like it did before the half turn.

Clay

[TAQuest]

Originally Posted by "QUICK-SILVER"

Depends on how fast the lifter bleeds down. After bleed down it will spin just like it did before the half turn.

Clay

Thanks Clay. It looks like the rockers were set up right.

[TAQuest]

I'm going to swap out the fuel. Then swap out the carb. Then swap out the HEI. None of that makes sense to me as the problem. Just have to do it. Thanks for the ideas.

["QUICK-SILVER"]

Didn't see or read where you had checked power to the distributor.

If the ressistance wire is still being used for power...HEI will run fine at low RPM's and then fizzle out when RPM's come up. This was a problem with factory HEI distributors installed in points cars. Given the quality of new aftermarket modules...problem might be even worse with a china repop HEI.

You could hot wire it with a toggle switch to see if it is a power supply problem.

Clay

[Murf]

Have you checked the voltage at the distributor yet?


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[TAQuest]

I'm going to hot wire it straight from the battery. Thanks for the idea.

[STEELCITYFIREBIRD]

Originally Posted by STEELCITYFIREBIRD

That cam is the Eddy Perfomer.
https://www.summitracing.com/parts/e...7/make/pontiac
Are you sure you have Full battery voltage to the Dizzy.
Appropriate spark plugs?

.....Post #34

I'd keep total mechanical timing to 32 or less with that much cylinder pressure... till you sort out problem, less you create much a larger scale problem.

And check timing as Steve25 called out for , and at higher RPM.

Then unplug your tach recheck timing, they can cause odd problems if bad or incompatible with your dizzy.

A vacuum gauge can tell you a lot about the base engine. I'd expect it to be ~18-20+ at idle with that cam and CR..

Careful setting valves,push rod spin is an acquired feel, zero play is a good description.
Some pictures of your valvetrain, close up of valve end/retainers open and closed may show if there is some bad geometry or interference going on.

It's an ignition problem, my best guess with the info so far.

HTH

[Steve C.]

Originally Posted by steve25

"You do not have any issues to look for in regards to the springs on those heads limiting the motors rpm if it will rev passed 3200 out of gear so stop going back and bringing that up."

His current valve springs may not be the specific issue at hand in his situation but once he gets it all sorted out those cheap Edelbrock single coil springs set up 0.250" away from coil bind is NOT optimum ! That was the point. That said, with the tiny cam it will peak out at such a low rpm anyway so no big deal.

Onward.

EDIT: to add NOT optium



.

[STEELCITYFIREBIRD]

Originally Posted by TAQuest

Can you add too much booster and get problems like this?

I don't believe so.

[Singleton]

Going back to the original question, "too much compression?", did you verify the stroke of the engine is 3.75", or is it a 4.21" or 4.25"? What was the piston part# on the receipt?

[TAQuest]

Going to put the valve cover back on. Put in a brand new battery. Hot wire the distributor. Go for a short test drive. Hopefully it's the Chinese 50K HEI that is the problem. I thought they either worked or they were dead. Didn't know they could consistently malfunction at high rpm. I don't feel like taking the HEI out of my 69 to swap so I will have to buy another to swap.

[STEELCITYFIREBIRD]

Originally Posted by TAQuest

I'm going to swap out the fuel. Then swap out the carb. Then swap out the HEI. None of that makes sense to me as the problem. Just have to do it. Thanks for the ideas.

If your swap-a-roo-ing do the HEI first, after confirming correct power supply.

The dizzy in it now is an HEI.?...MSD, Stock or China unit?

Edit......Just swap modules and harnesses, coil.

[TAQuest]

Originally Posted by Singleton

Going back to the original question, "too much compression?", did you verify the stroke of the engine is 3.75", or is it a 4.21" or 4.25"? What was the piston part# on the receipt?

The part number is; TRP L2262FSTD

[Murf]

Those pistons show 9.94 with 72cc. Doesn’t look like compression is a problem.

I’m still betting on ignition problems.

Murf


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[TAQuest]

Looks like these are it;
Brand:
Speed Pro
Manufacturer's Part Number:
L-2262F 30
Part Type:
Pistons
Product Line:
Speed-Pro Forged Pistons
Summit Racing Part Number:
SLP-L2262F30


UPC:
087674905749
Bore (in):
4.150 in.
Bore (mm):
105.410mm
Piston Style:
Flat top, with four valve reliefs
Piston Material:
Forged aluminum
Compression Height (in):
1.714 in.
Piston Head Volume (cc):
+6.70cc
Wrist Pin Style:
Press-fit
Pin Lock Rings Included:
No
Wrist Pin Included:
Yes
Pin Diameter (in):
0.980 in.
Piston Ring Thickness:
5/64 in. x 5/64 in. x 3/16 in.
Piston Rings Included:
No
Quantity:
Sold as a set of 8.