5.0 block with 4,7 heads - Performance gains?
#1
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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
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
#2
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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
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
#3
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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.
Guess what I'm running in my track car
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
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.
#4
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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
Best Regards,
Marc
DEVEK
#5
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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.
Thanks.
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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!
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!