Ian928

Thank you all for your info on welding the block.

I am still wondering if anyone has ever put 4.7S euro heads on a 5.0 block? In reality, I will keep everything from the 4.7 except block and pistons.

I am wondering what performance gain I could expect?

Is there any known problems with this?

Ian

Erik - Denmark

I have no experience with this, but there must come a problem with the compaction ratio.
Either you have to machine the pistons or enlarge the combustion rooms in the cylinder heads.
I am also looking forwards to hear what the experts are saying to this
Regards from Erik in Denmark
928 S2 - 1984 - Euro - Aut - Black/black

John Veninger

Ian,

Guess what I'm running in my track car
You can use your Euro heads and intake on a 5.0 block, but you must use pistons from an 85-86 US 32V motor. S4 pistons will yield to low of a compression ratio. You also need to machine the pistons for the 2 valve clearance.
The results is a motor with a compression ratio of 10.3 to 1 and about 290-300HP to the rear wheels.

Fastest928

We have built that exact engine...without headers and with cats acheived 303rwhp using the stock CIS system. We are now using a our DTA fuel and ign system and expect to gain about 20 rwhp.

Best Regards,
Marc
DEVEK

Kevin in Atlanta

After some procastination I am going to mate my '85 Euro intakes, etc to my '86 5.0 block, too. How did you know how to modify the pistons for the Euro valves? Is there a template or something? Or did you take an impression from the Euro pistons.

Thanks.

Jack '84 928s

Of if using the s4 pistion is to low of compression, that could be good using a supercharger. How low of compression would it give?

Jack '84 928s

Ok if S4 pistions give 8:0 then with a 4 core intercooler its coool... im so drunnnk right now lol

Rich9928p

I purchased a drive train that is a 5.0 - liter block (1985 32 valve block) with 1983 Euro S heads and cams. The engine had one strange thing, US L-Jetronic injection mated to the larger Euro throttle body and intake runners. The previous owner had dyno reports of 280 - 295 HP at the wheels. I changed the injection and intakes to K-Jetronic and haven't had it dyno'ed yet. It runs real strong.

The pistons did have small grooves cut into them.

The downside was the "donor" car went into a wall. After installing this fine drivetrain I suffered the following problems that I presume were caused by the stress of the crash:
- broked driver side cam
- three gears damaged when transmission went
- required an entire new clutch

SO, even if a deal sounds good, beware of parts from wrecked cars!