Heads

[Brian_e]

[KitS]

Off road, sand rail. Stock sedan swing axle. 29" X 10" rears or 30 X 15 paddles. Rarely hitting 4K RPM.

I have a set of heads that Brothers did for me. They are standard German 35.5 X 32, have had their combustion cambers blended and opened up to 58CC. The ports and passages were cleaned of all casting artifacts and smoothed out. The guides, springs, keepers and locks have all been replaced. A three angle valve job was done. They have the stock rockers but have had a solid rocker shaft kit from Empi installed. They were bored for 92mm thick wall cylinders.

All in all, a good chunk of change. I will buy another set of heads if needed but really want to get it right the second time if I do.

Help!

KitS

[Dusty1]

[KitS]

Thanks for that Smurfy, I've been leaning that way. I guess it's always easy to pull the motor and swap the heads later. You were quite close in your estimate: it's a 76 X 92 engine with a W110 cam. The car is a tubular framed sand rail, never weighed it, but I'd guess less than 1200 pounds.

The engine in it now is a 1600 (or so I was told when I bought it) that is getting tired, oil pressure light comes on at idle when warm and pressure drops to under 10psi. It has a lot of leaks. But it still runs and pushes the car quite well.

This 2 litre build I am doing is a ground up. All new parts except the case, head castings, rockers and some of the valves. It's at short block stage now. I'll probably take it to long block today.

The case came to me thru Brothers, I had taken a case to them to work and it turned out to have cracks. So they sourced another for me and worked it to my specs. I can't say enough good about them, they do superior work and go the distance to help their customers.

KitS

[Teeroy]

For a smaller engine you will make more torque with small valve heads over big valve heads. I just proved this on my 1776 Friday. Same engine, same car, same dyno different heads. Went from Berg P&P big valve heads 81whp 93 ft lbs torque, to Tims Super Stock P&P small valve heads 89 whp (did not expect this increase) and 100 ft lbs torque (expected this increase).
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[modok]

NICE result!

DUSTY....
The mexican 043H heads had smaller ports which almost look like somebody used a flow bench finally, (no spring bump in intake port)
They were......I assume replacement heads for mexican taxis
Some had 3/4 reach plugs, others had 1/2 reach, some had small valves some had regular valves, some had big valves.
The spark plugs and valve sizes were whatever they put in the raw casting when ordered for sale to OUR market.
popular 10-20 years ago, when people speak of 043 heads they mean the mexican 043H

but not all heads with 043 casting number are the same, there are many, probably 10 different kinds. Different plants in different countries. There are even things like mexican 311 heads, i have a pair now.

Autolinea is in brazil, vw of mexico was in mexico, I doubt they are the same molds shared between countries, the molds are probably all worn out anyway, but these days it's not hard to copy things. I could be wrong. who knows what happens down there.

[Brian_e]

Another thing to add is the last few castings usually go the small chamber, and the .055" step. This really causes all kinds of problems when trying to re-use old heads on larger engines. Once you get rid of the step, you end up with a 48cc chamber. This really sucks when you are trying to use the heads on a 1904cc bus engine.

You can hog the chambers to add volume till you are blue in the face, and all you will end up with is sore hands and a really crappy semi-hemi chamber.

This is why the newer casting heads like aa500 are great. They used to come with a 61cc, no-step chamber so you had all kinds of options. They recently switched to the stock valve aa500 only come with a 54cc chamber, which is still lots of room to work on bigger engines, while still keeping a nice tight deck height.

Brian
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