Can anyone post some numbers for the L31's bench flow data. I know it was in one of the recent Car Crafts, but I can't find it anywhere. Thanks for the help.

 

www.chevyhiperformance.com

They gloat that they have all the flow data for every aftermarket chevy head, but they dont have the numbers on Fast Burns ! But I am sure they have it on the Vortechs.

 

Thanks, that's an even better article then I was talking about in Car Craft. Next time somebody wants knock Vortecs, I'll just send them there.

 

Np.

It isnt a bad sight, eh? The format can be a bit confusing, and **** you off, but all and all some good info.

 

Flow numbers aren't everything.... The Vortecs require other parts to deploy them on most engines and upgrades to the valvetrain are a must to run any appreciable lift with them, which makes them less desirable depending on the end goals for the engine. I agree that they may be the best bang for the buck out there, but only by a little bit - and not if your plans include making really big power in the future or are looking for the benefits of an AL head.....

Laterzzzzz,
Matt

 

Matt,
I'm not trying to flame here, but most people using Vortecs use them for a budget engine. I used them b/c they came on 1 of 2 350's I bought for $500. You are correct in the parts needed for use. They do require a specific intake, self guided rockers, and are only compatible with centerbolt covers, unless a $130 adapter is used. Bottom line for me is they are good heads, but there are better aluminum, and even aftermarket iron heads out there. If your on a budget, I would recommend them. If you aren't, and are looking for over 375hp, look harder at some others.

 

True, true.

$200-300 for a 375 horse head aint bad. The true benefit of these heads are their 90s technology. The quench factor is the best of any iron head and let you run alluminum compression ratios, without much fear of detonation. And it is a nice, crisp, fuel efficient burn, secont only to fast burn heads. Both are based upon technology inspired by the Ls1 head.

Cant beat that for $250!!!

 

I wonder how the fastburns compare to the vortecs? definatly a sizable weight savings...
I'm wondering if a fastburn swap from the vortecs would give you a appreciable hp gain? changing nothing but the heads..

 

Hey, you are using Apeiron's avatar! He won't like that.

Vortec's are good for more like 450 hp. Chevy High Performance just did a 422 hp engine with them late last year.

 

And don't forget the swirl capabilities. That's what makes them so great. Just from that alone actually makes them happier with less advanced ignition timing. They're very efficient.

BTW, IIRC, they're based on the LT1 design.

AJ

 

Who's Apeiron?

btw I got this off an avatar site. :rockon:

 

He's a regular on this site. He's used that avatar since they've allowed them.

 

As I recall Aperion drew and animated that himself too.

 

Sitting Bull,
Your right. I have seen a couple build ups, both going over 400hp. I was just thinking that if someone wanted 450hp, they probably have the money for higher end heads.

 

I know someone would give me grief (not much) for that when I said that. It was inspired by the LT1, but the LS1 and Ls6 use the same technology.

Swirl? I prefer quench, and that is what I meant about the 90s technology. For you amateur engine builders, just because you dont have 90 heads, doesnt mean you should give up on quench.

 

Not nessesarily. If you can get away with Iron heads, than spend the saved money somewhere else. Put porting these heads for 450+ hp flow numbers would add up to alluminum head prices quickly.