what have i got here guys. the guy i got them from states 64cc Vortec Gen 1.....
after researching myself all the info i can find say gen 1 gm 350..nothing about vortec. some other tech pages say they are swirl port truck heads that aren't worth anything for street/strip performance as the swirl port cuts down the air flow at 4500rpm and bogs the motor down. i have had this happen and couldn't figure out why.
Are these my problem?

thanks for any info!

date code is B 250

 

"Vortec" is beginning to supplant "from a Vette" as the latest hot-rod rip-of buzzword.

You are correct in your suspicions about getting lied to and stolen from; those are NOT Vortecs. AFAIK they are swirlies. They've been around for QUITE A BIT longer than Vortecs; since the early 90s AFAIK. Vortecs appeared in 96.

The ONLY 2 Vortec casting numbers are 062 and 906.

Another great word to avoid is "bog". That's one of those ones that doesn't really have a specific meaning; people use it to talk about just about any condition where the motor seems to run worse than it did a second or 2 before. You'd probably be able to get more hwlp if you can describe EXACTLY what the motor did.

The typical effect of swirlies on an otherwise strong-running motor, is the "tractor motor" effect. You get this great grunt off the line, sems like it takes off pretty good, but by the time it gets to the top of 1st gear, it has quit accelerating. Then it kind of hangs in gear, and eventually shifts; takes off good again, and kind of hangs when it gets to the top of second. It's caused by poor flow, which doesn't matter so much when the RPM is low, because the cyls have plenty of time to draw in their charge past the obstruction, and it can even work to a benefit. But then when the RPM gets too high, no further flow occurs, therefore no additional power is created, therefore it stops accelerating. Kind of like your typical LG4 car or something where you go to pass somebody and it kicks down into 2nd gear but goes exactly NOWHERE.

If that's how your car runs, then yeah, those heads could easily be the culprit.

I'm sorry to see that there's dishonest people out there trying to take advantage of the uninformed, and that you got vicitmized. Not much to do now except to write it off as an installment of the dumba$$ tax, and move on. If I could have back every payment of that tax that I'VE made, I'd be a wealthy person I'm sure!!!

 

Hey Sofakindom, are 081 heads from a 305 or 350 TPI. Can I use them on my 89 305 TBI to replace my 187 swirlies?. I hear they are a direct bolt on and a good substitute.

 

yes, those are 305 TPI heads.

 

probably they are for low rpm tork

 

This thread is now old enough, even since its last post, to VOTE in the latest round of elections.

I applaud your use of the "search" function to find interesting stuff, butt a bit of ... discretion ... goes a long way toward not awakening a post from the dead by posting useless DRIVEL about it. Necrophilia is kinda gross, even on the Interwebz.

We'll give you the benefit of the doubt and not call you an AI bot, since you misspelled "torque", which one of those would be highly unlikely to do.

That said, date code B250 means the heads were cast the 25th day of month B (the 2nd month, i.e. February) in a year ending in 0 (most likely, 1990). Since "Vortec" was introduced in 1996, that pretty much rules out this CRAP as being that.

Yes, generally, the TBI heads of this sort were optimized for low RPM torque, at the expense of just about everything else.