Senior Tech Team
Join Date: Feb 2002
Location: Howard Lake, MN, USA
Re: any drop in valve springs/retainers for vortec heads..
wow... i posted this a year and a half ago...
to button this up: after getting bored one day, i popped a few springs off the vortec heads and measured the retainer to seal clearance. they were all between .540 and .560, which was way more than i needed and a LOT more than everyone said it would be on stock unmolested vortec heads. so i got ambitious one friday afternoon and pulled the 305 heads off the 355 in the car, swapped the springs over to the vortecs, and slammed them on with some head gaskets i had laying around.
going from the 305 heads to the vortecs was like going from a 4 cylinder to a V8: i don't know how much power i picked up, but the car will actually make power up past 6000 rpm now where it would die off at about 4500 before. it has better throttle response, better fuel economy, and is a whole lot faster. the exhaust even sounds a whole lot meaner. it's like a whole different car.. i can't wait to get the 5 speed swapped in sometime in the next month or so. that should be fun until that trans (non WC t5 out of an 85 Z28) pukes it's guts all over the road..
"Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut"