Modification advice wanted!

[magna_swede]

Hello friends!

I'm in need of some good advice. In the end (two years from now) my engine will look like this:

Donor Engine 1987 5.0 EFI HO
High comp pistons + better camshaft + heads with roller rockers + perfomance intake manifold + injectors & mass air conversion (Speed density is present).

Now I'm rebuilding the engine in order to pass Swedish registration, that means low power engine is required for passing the test. So, I will prepare the engine body (block + rods & piston) for tuning after registration, camshaft and others will be done afterwords.

So here comes the questions:
1: Advice on pistons, +0,030, that will work with stock cam, head and intake, but also will work well with above describen modifications. (I don't want to lift the engine for tuning after registration)
2::Reboring of engine, what's max boring of stock block? +0.030 or more?
3: What's size of the combustion chamber on stock heads?
4: Does the tsock ignition system cope with +350 bhp?
5: What sparkplugs is recommended for this level of modified engine?

That's all for now, but I'm convinced that more question will occure..

Best regards Roy
http://drive.to/roys

[PSB]

Roy,

I'll try to answer the ones I know:

1. Buy pistons that have valve reliefs that will work with your new heads and camshaft. These pistons will work fine with your stock heads and cam. Most of the aftermarket piston manufacturers offer pistons that have valve reliefs. You'll need to talk it over with whoever you are buying your pistons from. Tell them what heads and cam you are using and they should be able to recommend the right pistons. Your best bet is to buy your pistons, heads and cam from the same place so they can set you up with a good combo. A couple places that I've had good luck with: AD Performance and Total Engine Airflow .

2. Don't know

3. I think it's 58cc, but I'm not certain on that.

4. The stock ignition will handle 350hp, but you can gain some horespower by adding an ignition box like an MSD 6AL or a Mallory HiFire. These boxes also include a rev limiter, which is cheap insurance against over-revving your engine.

5. Most aftermarket head manufacturers recommend specific sparkplugs to use with the heads, so this will depend on what heads you buy.


Pete

[SFfiredog]

Hello,

The '87 5.0 HO came with excellent forged piston from the factory easily capable of handling your horsepower requirements.
Depending on the milage and condition of the short block, you may be able to use your original pistons with a fresh hone and new rings.
If not DSS www.dssracing.com offers excellent replacement pistons that will fit most any aftermarket head/camshaft.

I would never bore a late model 5.0 more than .030"

Stock cylinder heads (E7TZ) have a 64 cc combustion chamber.

The stock EEC IV ignition system is more than capable of handleing 350 hp

I believe the stock spark plug is a Motorcraft AWSF-42C If you change to aftermarket heads, which will be required for your horsepower goals the type of plug may change from a tapered seat to a gasketed seat. The gasket seat plug to use with AFR heads (which I highly recomend) is an AGSP-32C

HTH,
Mike