I found these..
http://www.texas-speed.com/shop/item...d=667&catid=40


200cc/62cc chamber, 3.900" bore PRC heads.. I've heard mix stories about PRC products..

Does a smaller port mean more port velocity?? The flow #'s are ok... Who knows about CYL filling/swirl capabilities..

Any insight?? I'm thinking about saying f*k it and just get a set of Mongoose AFR heads..

 

you should get a great street car with those heads. the smaller runner wil make good power in the low and mid range. and the flow numbers seem reasonable for good power up top.

what cam are you gonna run?

i've looked at those heads myself. better than the Darts, but a bit cheaper than the AFR.

for me, i don't need a dyno queen or a track car. 5yrs and the car hasn't been to the track yet. so a good street setup is what i'm after. and those heads are in my list of "part to consider"

 

From the specs that they give it looks like they would do really well on a stock cube motor.

 

IMO, that's way too much money to spend on stock castings....especially LS1 castings..

It's not easy to make a true 300cfm on stock LS1 castings using the stock runner volume...in fact, I'd venture to say that it's nearly impossible unless you put tons of hours into the heads. LSx heads are VERY funny on the flowbench and are very very finicky when it comes to fixturing them to get accurate numbers.

Also, they don't post exhaust numbers..... why?

Also, they remain at near-stock combustion chamber volume... why you ask? Well, if they were decked to raise compression, they'd flow less and wouldn't be able to advertise them as 300cfm heads... actually they'd make more power with more compression... where are the horsepower numbers? Surely they had a test mule at the shop...

I'd spend my $1600 elsewhere IMO. Sounds kinda funny to me...

Mike

 

Those are CNC ported Edelbrock heads. And IMO, depending upon the build, I'd gladly run $2000+ ported stock head.

 

Ah... the OP said that they were PRC heads. So, they are Edelbrock ported by Texas-Speed? I haven't heard of anyone using the Edelbrock stuff.

I'd go with tried and true stuff over "new" combos.

$2000+? Maybe for LS6 heads. You're out of your mind if you go with LS1 stuff for that much. Meaux charges $1700ish for his full job LS6 heads (not including the heads, which you can pick up for $400-500 used). Those are pretty much the baddest stock casting LS heads you can put on your car.

Mike

 

Well, they are PRC ported Edelbrock heads... And PRC is owned by Texas Speed.

There are a few others besides Larry Meaux that can get an LS6 head to really work, and mostly in the max effort type builds. Last I checked all those porters were asking over $2000 for their heads with no core. But you're right, paying that much for a good 241 head is stupid today. I paid that much for my 241s many years ago, but that was all that was available at the time.

 

It's a TR/PatG TQR Cam, 224/228 .637 .639 110 +0 (5* OL)... It's not an advertised cam... I've talked w/ PG about this for a little while.. I was WANTING to go thru TR for all the parts.. Hopefully if I buy enough from them, they'll throw in a tune and the PR's... I REALLY don't feel like paying $400 for the damn tune if I spend $3000 thru them.. I was going to see if they could hook me up with their AFR H/C Combo price but with the custom grind instead of the CheaTR cam...

We'll see what happens..

I'm the same way bro.. I've had this car for 5 years too (JUST paid off!! ) and it's never seen the track.. I'm a street person..

good point.. I can't find the casting #, but they DO say LS1 based so it's gotta be the 241...

And, contact info on the $1700 243 heads?? Website??



Hmm... Good points. I should just get the damn AFR's.. The money should be in this week, so I'll try to do some wheeling and dealing w/ TR.. I'll keep posted..

I've also heard, from an un named source, that PRC sometimes ports their intake runners TOO much and the rocker stud/intake wall can be literally paper thin some times.. = dropped rockers and cracked heads..



But back to one of my original Q's, won't smaller CC runners give more port velocity??

 

The very first batch of PRC heads did have that problem. That was the old 237cc design. They have since revised the cylinder heads several times, and now run a 220cc port which believe it or not, flows substantially more.

Given a certain flow rate, the heads with the smaller cross sectional area almost always provides more velocity throughout the flow range. Cross section of the port is different from port volume, but closely related. Compare a traditional SBC 170cc port to a 210cc port LS1 head. The LS1 head will have more velocity due to the narrow port design - hence a superior cross section.

 

^ Hmm.. Good stuff..

Take a gander at the ports..

 

Meaux takes around 6 months to port heads.

The only person you can go through that I know of would be Futral.

It's not $1700 243 heads.. If you re-read what I said, I said it was around $1700 in labor.

 

PRC also has a set of 243 or 799 casting LS6 heads that are all cnc'd and whatnot called the LS6 Stage 1

http://texas-speed.com/shop/item.asp...d=649&catid=20

my question is what is the intake runner volume on LS6 heads???

 

Stock intake runner is around 210cc, but they can go upwards of 240cc with porting.

Mike

 

thanks

 

You're 2/3 of the way there so honestly, I'd spend the extra $600 and get some AFR's and make more power up top and under the curve.

I haven't been impressed with what I've seen from those PRC Terminators. People seem to have better results from their stage 2.5 5.3 head. If I decide to go with ported stockers, I'll probably go with TEA.