stroker cams

[99BlackW68]

lately ive been thinking about cam compatability with a 4.2L stroker. does a custom grind cam need to be used with a stroked 3800? or would..say a ZZP XPZ cam work well with a stroker

[97rs4life]

Re: stroker cams

needs to be custom ground as a part of it has to be reduced to work with the COME stroker. A XPZ would not work unless you had the extra work done to it

[99BlackW68]

Re: stroker cams

yeah thats what i thought. thats a drag...oh well though, custom grind if done right will be better than a mass produced cam.

[Firebirdkid96]

Re: stroker cams

exactly.

by stroking the motor you're decreasing valve clearance by however much you're adding to the stroke, assuming a flat top piston.

two options= custom cam or pistons with valve recesses

[ProStreet1]

Re: stroker cams

exactly.

by stroking the motor you're decreasing valve clearance by however much you're adding to the stroke, assuming a flat top piston.

two options= custom cam or pistons with valve recesses

What actually takes place when you add stroke to the engine is that the pin height is moved up in the piston. The piston still comes to the top of the bore the same as it does with a stock stroke crank. The camshaft is special because of cam to rod clearance. The camshafts are generally ground with a .040 smaller based circle... Hopes this helps.

[Firebirdkid96]

Re: stroker cams

i don't know what i was thinking when i said that...lol

[IDoVoodoo]

Re: stroker cams

Swan racing recommends a .030 to .040" smaller base circle. The XPZ cam will have plenty of clearance w/ a .070" smaller base circle (fwiw, even my GT2 was .034" smaller). ZZP doesn't list the specs on the XPZ cam. I'm sure it would work w/ a stroker kit but probably wouldn't be the best. You'd want to run a bigger cam to take advantage of that extra displacement.

[99BlackW68]

Re: stroker cams

does Come Racing make a cam designed for use with a 4.2 stroker (or anyone for that matter)? that'd make life easier. I just threw out XPZ because its ZZP's largest FI cam.

[IDoVoodoo]

Re: stroker cams

yeah, they have their own cam grinds