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Good point and that block would be worth a lot more to an A body guy

With that date I would have bet $1 no boss

I think you're describing 440source stealth heads aren't you? =) I've been disappointed with every set of 516's I've used, including 2 sets that had reasonable 1.74 work and some porting. I'm really going to try to never use them again lol

I'll politely disagree. 906's have a distinct flow advantage .300-.450" lift even in stock form. Many 516's are over 80cc. Some 906's can be 90cc, but some are 87-88. The CR becomes small.

70's blocks resurrect it for low mount ps pumps I think?

Yes. Should still have 516's. A chance that it might have small exhaust valve 915's which would be better than the 516's

Oh and a 66 should be 516

906 is a better flowing design with larger exhaust valve and better ports. It is open chamber where 516 is closed but the actual difference in compression ratio is usually much smaller than people think

Fwiw I have what should be bolt on ready 906 heads that I'd sell for about what those cores are. Unclear if you meant they are ready to run or rebuildable cores. Cores have about $5 value honestly.

What did you mean by dump gas? Like you could see it dribbling out the venturis at idle? Spewing out the vents?

The vac would affect it because ported is completely off in all these states but manifold it's pulling the VA but then the vac changes when you drop it in gear. The vac also is very high when idle deceleration but will drop as rpm drops

You have VA tied to manifold vacuum not ported vacuum then? I've rarely had OEM cam but 500rpm is low to me even if the fsm says so. 700-800 for me with RV cams. Lets the alt charge a bit better and water pump run a little faster at idle.

Fwiw a vacuum leak won't mean you have no vacuum, otherwise you'd have a runaway diesel on your hands

What are your vacuum readings in the different rpms and driving conditions? What all did you take apart when you did the chain?

The guides were ok iirc, small correcting of the seats

And there's no way those 516's are only needing to be cut for the 1.74's. I own a set of stealths and I chose to have Dwayne correct the vj and port them a little, but those weren't mandatory steps.

Stealth heads are $1400 for the pair and would make a huge difference in performance. Even if you 'only' had to spend the $900 to get your 516's serviceable imo you should find the other $500 in your project budget. No single other expense would bring as much benefit.

depending on how long a wandering road you go down, yes it might be just as cost effective.

Yes, I have had 1 set of 516's near that and they were heavily milled. Another set was milled some and still only 78cc Dwayne's numbers are very valuable yes.

We're entering pissing match territory but plenty of real world tests show what people on this board consider 'race' parts generally help at lower rpms and more street life situations than they realize. The compression difference depends on the specific castings. The low and mid lift flow...