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Old 06-29-17, 12:40AM   #16
JSPONT
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If it ran for 50 minutes with out a fan on a stand, no wonder why the head is cracked. Hope someone makes good, hang in there.
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Old 07-13-17, 01:43PM   #17
Seven
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Sorry for the confusion.
The engine builder ran it for 50 minutes. I don't know if the fan was running or not. I didn't get a video of this run.

My mechanic (installer) ran it himself for 20 minutes before things when array. I came over to his shop so he could show me the problem. This is the video I took, which shows that the fan isn't running during this third running of the engine.

As far as I can surmise, either the head was cracked from the get go and didn't rear its ugly head till i got it. Or, the builder cracked it during his 50 minute run, or my installer cracked it during his 20 minute run.

But its been shipped back to the builder. Now I need a replacement.

For the car, we swapped the Firebird fenders, doors, hood and spoiler from the Trams AM "parts car" I bought. We also ended up swapping the whole steering column because the bearings on the Firebird's where worn out and it rocked up and down.

the Firebird is currently at the paint/body shop getting sand blasted, smoothed out and will get a fresh new paint.
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Last edited by Seven : 07-13-17 at 01:55PM.
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Old 07-17-17, 01:50PM   #18
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New Cylinder head arrived, going to get the engine put back together now

Regarding the EGR cavities...
I was told that Pontiac only has one manifold available for this engine, the Torker 2, but it is not designed to cover the 4X head EGR holes. Which manifold is designed for the 4X heads? Anyone have a recommendation on which gaskets to use to put it back together?

When the engine was delivered at the shop, those EGR holes was the first thing that we noticed and asked, "Aren't those those holes supposed to be covered?" They engine builder responded that they were stock for Pontiac Engines, which I assumed was him saying "No", but it really didn't answer the question. If we use a plate to cover them, would this be welded or epoxied?

Last edited by Seven : 07-17-17 at 02:33PM.
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Old 11-09-17, 01:14AM   #19
sprint250
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Default Pontiac Cylinder head Intake mis match explained

SEVEN did you ever get the engine problem fixed?
Is the car running now?

I notice this post went cold in JULY.
The attached article may shed some light on what you were seeing between the cylinder heads & the intake manifold.
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Old 11-13-17, 09:09PM   #20
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The engine is all back together and runs great. Needed some tuning done, but all-in-all it runs.

it is currently not in the car yet. The car is still at the body/paint shop. I was told that the block sanding is done, and now ready for color.

We got a good lead on new front shocks that will help keep the car level with all the new added weight of the engine.

We are on the lookout for a transmission (with overdrive) that will be able to bolt into the engine and be able to handle its current HP of 500 and future HP (if and when we ever get turbo's added on). Ideally I want something that can handle 1000HP.

Thanks Sprint for the info.
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Old 11-14-17, 02:16AM   #21
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Good to hear its back on track.
Hopefully you have a heated garage and you can work through the winter.

Another method for blocking the EGR /heat riser passage is pouring it solid with molten aluminum but that requires removing the cylinder head and pulling the valve(s) out of the port(s) that the heat riser passage is connected to.
On older Pontiac heads (326,389,421 and earlier) the heat riser passage was connected to the two center exhaust ports and to get full benefit from tuned headers the siamesed heat riser passage was poured solid with aluminum , That required pulling the 2 center exhaust valves to make the pour and then grind out the excess aluminum for a smooth finish in the port(s) and the head's gasket mating surface.
The result was a true tuned system on the center exhaust ports and a power increase.
Problem was if it was a street car the carburetor manifold heat provision was now gone and cold starts/warmups in winter would make for less than ideal performance on the street.
Pontiac finally corrected that on the later cast iron heads & only one exhaust port provides the intake carb/manifold heat passage. Your heads are the later model 4X heads.
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