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P30 7.4 chevrolet jeff gawley england 10-19-12  
Hi i am going to fit new exaust gasgets too my RV p30 chassis first what is the correct spanner size. ?? also should i fit the new gaskets dry or with some compound sealer ??the engine is 7.4 i have the new factory gasgets. should the engine be warm or cold. jeff gawley
Re: p30 7.4 chevrolet BUBBA THE BUS TECH 10-19-12  
Usually 9/16 or 15 mm depending on pre or post metric.

There is no way in heck you are going to do this on a warm engine. Its going to take several hours.

The exsauhst manifolds will be warped, every single time. You might get lucky and get them to seal, but I doubt it. take them off and machine them. HINT: I use a large wood working bed type belt sander to true them up well enough to seal, works great costs 1 X $8 belt per manifold and about 1/2 hour per.

Fianaly gaskets go on dry unlessyou are using spiffy aftermarket gaskets, then follow the included directions.

Good Luck
Re: p30 7.4 chevrolet jeff gawley 10-24-12  
Hi bubba. thanks for the info.i have renewed the manifold gaskets. all went well. sounds real good now.
Re: p30 7.4 chevrolet jeff gawley 11-4-12  
Hi bubba. i told you i replaced my manifold gasket. runs and sounds much better BUT after its been running for some time the temperature rises very high. so i stopped the engine. ?? i removed the radiator cap and water came out very fast. ??? can you tell me what is wrong. do i need new head gaskets also ??? jeff
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