Which would you go with?

[DRIVEN]

Just make sure it's an actual vortec engine and not a swirl port engine that someone thinks is a vortec simply because it has center bolt valve covers. Too much of that going around.

Excellent point.

 

[othtim]

we had vortec heads on the engine in our oss car and that engine put out 575 hp and would run at 8000 rpm all day. Vortec heads can be reworked...I dont mean to get off topic but were those stock castings or the aftermarket 2.02 vortecs

they were aluminium so they had to be aftermarket but the engine builder is very tight lipped when it comes to the engines he builds, especially the heads if it's not a spec engine. This is the builder..

http://www.leitchperformanceengines.com/

You sure they weren't the aluminum "fast-burn" heads ? Coulda been, if they were alum. Either way those are good numbers. I think 400ish is pretty reasonable expectation for more stockish vortec heads.