New to me 78 NYB on its way but please Don't tell my wife

[78Brougham]

Titless...

 

[commando1]

need to do some math to see what the CR would be.

You don't believe me, huh?

Truthfully, it's best you don't...
Seriously, I'll be interested in what you come up with for numbers.

 

[70bigblockdodge]

You don't believe me, huh?

Truthfully, it's best you don't...
Seriously, I'll be interested in what you come up with for numbers.

I'll take a guess. Piston is down in the hole .120-140, chamber volume is on the low side maybe 90cc, high side 92 cc, you had a composite gasket on there.

You will never get crisp throttle response out of a engine with compression that low. It will always feel lazy. IMHO

 

[commando1]

You will never get crisp throttle response out of a engine with compression that low. It will always feel lazy. IMHO

Hence the using of the raised dome is required here.

 

[70bigblockdodge]

Hence the using of the raised dome is required here.

Or deck the block. Need to know the measured compression height of the current pistons. Then come up at least .060-070 that should put it about 9:1

 

[commando1]

Or deck the block

I don't like decking the block because then you have to shave the intake manifold.

 

[70bigblockdodge]

I don't like decking the block because then you have to shave the intake manifold.

Yes, it starts to make bastard parts. If the deck is at the factory spec I would leave it alone, if it is above factory spec and/or crooked it could come into spec and be proper.
A step head hypereutectic piston would help kill off that dead area across from the spark plugs on a big block and raise the compression without breaking the bank.

 

[73 T&C]

Yes, it starts to make bastard parts. If the deck is at the factory spec I would leave it alone, if it is above factory spec and/or crooked it could come into spec and be proper.
A step head hypereutectic piston would help kill off that dead area across from the spark plugs on a big block and raise the compression without breaking the bank.

I was looking at that but the ones I was looking at stated that the heads would need machining to allow them.

I’m looking to get a little over 9/1 CR. Nothing too crazy. The agree that 7.8/1 sucks.

flat top with relief for valves as to insurance.

 

[cantflip]

damn! Would have brought the 73 RoadRunner....

We can do it again soon...

 

[70bigblockdodge]

I was looking at that but the ones I was looking at stated that the heads would need machining to allow them.

I’m looking to get a little over 9/1 CR. Nothing too crazy. The agree that 7.8/1 sucks.

flat top with relief for valves as to insurance.

Something like the KB 237, has over 2.0" compression height, so it acts like a six pack piston height in the bore wise. That should put you in the ~9:1 range.

 

[3175375]

The ATC not working is a bummer. I would think that I'm a pretty damn good mechanic but that ATC is enough of a deterrent to make me pass on a car with ATC. I have manual A/C in both of my Formals and it was a breeze to rebuild the A/C system in both of them and get them working.

I’d take an ATC car anytime.

 

[73 T&C]

I’d take an ATC car anytime.

Me too

 

[73 T&C]

We can do it again soon...

Let’s look to next month... restaurants are closed down here. Nap may be done by then.

 

[73 T&C]

Something like the KB 237, has over 2.0" compression height, so it acts like a six pack piston height in the bore wise. That should put you in the ~9:1 range.

That’s what I’m looking at. Waiting on the block to see if we end up at .30 over to order them.

the raised dome KB 137.... may be too much.

 

[commando1]

the raised dome KB 137.... may be too much.

Just back off on the timing and put on an Edelbrock.

 

[70bigblockdodge]

Just back off on the timing and put on an Edelbrock.

Nooooooooo!
Retarded timing sucks. My frankenstein TQ is performing well. I'm getting mid teens for mpg. I need to make a point of getting the A/F ratio guage back in before the Nats.

 

[73 T&C]

Hiccup from Summit .... They can’t get me the cam shaft I ordered two weeks ago til the end of August.... maybe

so I’m going to hunt around for a quicker delivery.

block has been stripped and went in the tank today. Original machine shop didn’t work out new one seems more appreciative of my work.

heads in today.

 

[73 T&C]

Just back off on the timing and put on an Edelbrock.

Thermoquad hater!

 

[commando1]

Thermoquad hater!

Absolutely and unashamedly.

 

[73 T&C]

Block out of the tank Clean as can be....and has checked out as good via a magnaflux. Hopefully they will machine it tomorrow and let me know what size pistons to order.