largecar379

WOW!!!

just got my Euro heads (16V) back from Nickens Bros Racing.

They build engines for Erica Ender's Pro Stock HEMI Dodge.

they reworked the heads, including porting, polishing, 5 angle valve job, unshrouded the valve pockets and light milling (still within spec's). Basically staying with the parameters of building a bad *** street/strip motor for my Euro (no, it probably won't see any drag strip use, but you get the idea).

Absolutely wonderful to look at...they did a fantastic job on my heads.

the pics below are not great, it's hard to see just how big the ports are opened, but I can assure you it is great machining work.

Now if I can just get on with the rest of the motor----cams next.


-----Russ

6mil928

Awesome looking car. Jason

largecar379

Future Pro Stock Racer----- "Motorman"

500 cubic inches of HEMI motor, running about 1500 hp.

wish I had one----but it takes about 10 mil to run a competitive operation these days.....

Maybe Russell will "grow" into it......

---Russ

dr bob

Nice looking port work. It's always nice when the intake ports are big enough allow you to reach in and adjust the plug gap.

6mil928

123quattro

Those look pretty...

Out of curiosity, can US heads be opened up as much with porting as Euro heads?

slate blue

I don't see why you couldn't open up the U.S heads, then stick in some decent sized valves. I have 2.08" valves in one of my heads, or pair of heads if you like.

What are your flow numbers before and after?

Greg

kccampro

I have a set of US heads of an '83... what's the dissadvantage of starting with non-Euro heads? If you're going through the expense of all that machine work, what's the main difference? I'm just not that familar with the difference between the US and Euro heads outside of the cams.

mark kibort

euro has big ports and valves, US doesnt, but porting and larger valves fixes that. However, what do you do about the missing 7ccs of combustion chamber. I guess you could shave the head by 1mm, but that isnt the best way to get the combustion back, but it probably would be fine. is 1mm shaving a problem?

mk

kccampro

Thanks Mark... so it's port size, valve size and 7cc smaller chamber? I'm assuming the real effect of the smaller shamber is higher compression? When you say larger ports, do you mean that actual intake and exhaust passages or the ports where the intake manifold and exhaust manifolds meet the heads?

mark kibort

the ports are actually larger, cast larger. (im almost positive, but someone could chime in here if they are not.) so both the opening is larger, and so are the actual ports. they mate to the euro intake which also has a larger inner diameter.

mk

kccampro

Thanks Mark...

Are the smaller port US heads better for making low end torque???

I’m reaching way into the back of my brain here and recalling engine work (non-Porsche) I did in a past life where using larger rectangular port heads that make more HP actually produced less low range torque than smaller diameter oval port heads because the larger passages flowed air at a slower velocity, which impacted low range torque specifically.
It was the flow rate equation Q = VA where Flow rate (Q) = velocity (V) times area (A). The larger the port, the slower the velocity of incoming air at a given flow rate. Similar concept to diesels and other high torque, low hp, low RPM engines using relatively low lift cams, because by decreasing area (A) you are increasing the velocity (V) of the incoming mixture past in the intake valve… so after all that… are the smaller port US heads better for making torque at low RPMs?

LT Texan

Are those Euro or Euro S heads?

Here's a pic of my Euro S's

mark kibort

actually, the euro is better all around. in theory, that is correct, like with back pressure, but in actuality, i saw no loss of low end torque and only gains in power.

mk

kccampro

Well... that answers that. Thanks again Mark.