REAPER13

This is what I am thinking as well. I am trying to squeeze as much N/A performance out as possible before I go turbo. The turbo set up won't be too aggressive, but 1000rwhp will be possible, but will only be done for dyno/track purposses. 700-800rwhp should be managable for the street which is what the car mostly see's.

Thats the paln.

REAPER13

AirborneZ28 - I am no machinist or head flow expert but from what I have seen and heard the stock LT4 heads plus machine work seem to do as well as the AFR's for less money. Now I will duck and cover for the storm I just pulled down on myself.

I have to agree with you in a way. The AI LT4's are very comparable to the AI TFS's. There is only a 4.5 CFM intake increase in the TFS's over the LT4's, and a 2.9 CFM increase on the exhaust side. I don't think that would be much to relly make a difference. There is a $520 price difference in favor of the LT4's and the LT4's come with a cam. You just need a core for the heads.

The AFR 227's have a 24.6 CFM increase on the intake over the AI TFS 215's, and a 36.5 CFM increase on the exhaust side over the AI TFS 215's. If these numbers prove to be right I will be going with the AFR 227's. With only a $154 difference over the AI TFS 215's, the 227's seem like a winner to me.

There are other differences such as AFR's 3/4" deck and 60/40 valve spacing and slightly larger intake valve. The only downfall is that shaft mount rockers are almost required. Any other differences please let me know.

Michael

joelster

LT4 heads get a bad reputation for some reason, but they flow decent right out of the box. The problem with your way of thinking is that you are forgetting the initial price of them They aren't cheap at all. They are $1400+ to begin with, and then you have to send them out for work.

....and those cores are quite a bit of money.

LOL at the price difference. Don't be mislead by AFR's internet pricing policies. Basically they TELL their dealers how low they are allowed to advertise. The dealers can sell the heads for as low as they want to. Most will gladly send you a lower price through an email, but not on their website. Shoot me a pm and I will tell you exactly what I paid for my 227's. I will give you a hint....it was well under $2k.

You don't need shaft rockers. You can run regular rockers with frequent checks (not recommended). You can order special stud rockers with an offset for around $300 right from AFR.

WS Sick

Most people frown on the LT4 heads because first you have to buy the heads and new they are 1000$ then you have to have them ported to get to the mentioned levels. Now if you find a set cheap it is a very enticing route.

I have AFR 190s Old Old style on my 383 atm, I had them flowed new, with a valve job and later had some work done on them. They flowed within 3 percent of advertized (1995 numbers) numbers, but a valvejob and a back cut on the valves gave them 5 percent more almost accross the board. The set I have when new had CNC chambers and 1/2 CNC ports, When they were worked on by a local porter recently, they picked up a rediculous amount. They are in line with some of the better 200 cc heads I have seen here but with better exhaust ports. Total over the last 16 years of owning these heads I now have had them on 3 different engines and payed close to 3 grand ....lol (this is heads and head work alone, not springs etc.)

REAPER13

Yeah thats why I said you still need a core though. I saw that you need offset rockers. But from what I gather the shaft's are highly recommended. I sent you a PM hook me up.

REAPER13

16 years and 3 engines later and they are still doing it for you. That sounds like good quality to me, especially if you have a upkeep on them every so often.

Puck

iTrader: (17)

AFR heads have always had ridiculously strong exhaust ports...great for boost . Hell, if I was going to dedicate all that money to a TT build I'd spend the cash on some converted AFR 230s and have Tony Mamo or Craig hand port em .

Also, don't forget that flow numbers don't always equate to performance. Look at LT vs LS heads for example. You can have an LS1 head that flows less then an LT1 head, but still make more power with a similar cam because they are much more efficient and maintain higher velocities.

For a turbo build in the power range you want, I would make ported AFRs my first choice and ported TFS heads like what AI offers my second slightly cheaper choice. You could run them out of the box for now, then have them ported for huge gains when you get your new pistons for the turbo build.

REAPER13

I am assuming you are talking about AFR SBC 235's and having them converted to LT. If so what all goes into that and what is the typical cost to do so. If I was to do that why not go with the AFR 245's. AFR has been my first choice, just trying to get some good feedback before making the decision. I am also assuming that if I was to have SBC heads converted my Vic Jr. EFI intake would bolt right up.

Michael

speed_demon24

iTrader: (6)

I'm not saying the AFR's will make more or less power, but buying heads based off advertised flow #'s is pretty much the worst thing you can do.

WS Sick

Yeah they are quite meaty and much heavier than the stock castings. Ive had then trued up twice. The valve-job was redone this last time around along with the guides.

joelster

The typical cost is around $300 to convert a pair of sbc heads to LT1. Clayton Racing can do it for you, so can Advanced Induction. There are a lot more shops that can do it, these are 2 off of the top of my head and they are both site sponsors.
If you have them converted just tell them you are keeping a stock sbc style intake so they don't change the intake bolt pattern.

REAPER13

But what all needs done, just bolt hole pattern,etc.,etc. Aything else need done to the heads. This just became alot more interesting for me.

Bumper Dragin Bird

iTrader: (8)

I got AFR LT4 195s. HAvent had any problems with them only when my rocker broke, but thats not the heads fault. Can anyone give me a part number for those AFR 227 everyone is talking about. Cant seem to find them, only for a SBC. unless ur converting them

REAPER13

They are on AFR's website under SBC LT. Here is the link:

http://www.airflowresearch.com/index.php?cPath=27

Bumper Dragin Bird

iTrader: (8)

cool thanks

REAPER13

I was gonna start a new thread to ask this question but since I already have a thread, why start a new one.

Has or is anyone running a 4 bolt FRONT main cap from Pro-Gram. I was just curious because I have never personally seen this done. I always think the beefier and stronger the bottom end, the less problems. If it cannot be done nor is it that big of a dea,l then I will go with the Howard Billets for all 5 caps. Thanks

Michael

gregrob

iTrader: (8)

What about your setup would necessitate this? Not saying it wouldn't be beneficial, but there are some very high HP cars that haven't found it to be a "weak link".

The money and effort would be better spent elsewhere IMO.

Just something to think about.

Z8'S

iTrader: (6)

I run the 4 bolt front cap from Pro Gram in my lt1. There isn't really enough material to install it correctly in a stock LT1 block, it is designed for the Bowtie blocks. But I needed all the help I could get.

SS MPSTR

iTrader: (1)

What had to be done to your heads the second time around?

fex77k

iTrader: (2)

Some guy in a wheelchair went *** wild on them. He flowed them on his 600 and picked up significant gains on them, another 5hp a cylinder on the flow sheets, not that it means much.