91RS5spd

Ill start off by saying that the car I now have is differen't then what my screen name says, What I have now is a 1991 z28 350/auto. ( I didn't want any confusion)

This is what im planning on doing. Soon id like to rebuild my motor and upgrade the heads and cam. I don't want anything too extream, all im looking for is improving the preformance to lets say...... the upper half of moderate level preformance. So in my mind getting a LT4 hot cam and AFR heads will do that for me.


So here the question with the cam, will I NEED tunning if I run just the cam? Also how will this cam behave regarding cam loop and drivability.

Head question, Whats the rigth AFR head for me? Ive been out of the 3rd gen relm for a little while and don't remember what works best. I want to get the proper heads for the aplication ill be running. Remember, im shooting for the upper half of the preformance bar but still want to keep my TPI set up.

Thanks

KiLLJ0Y

iTrader: (1)

yes you will need tuning... big time..

side note.. what rocker ratio are you going to be using? if you use 1.5's with the hot cam. your lift should be .492 .492 1.6 gives you .525 .525

its a lot bigger than a stock L98 cam so tuning is needed with just the cam.. the heads just allow it to breath better


my opinion is AFR's are nice.. but over priced.. im looking at the CNC ported TrickFlows that can handle the .550 lift for $1,300 from jeg or summit... $1,999 for AFR's.. which are still on back order, just seems too high..

gmgod

I paid $1300 for AFR's shipped to my door from www.tenperf.com. If your going to keep tpi (especially stock or ported) stick with somthing with a little less duration, like around 210 degrees intake and close to that on exhaust. Also, I think the trickflows have only the chamber cnc'd while the AFR's have the runners done as well.

91RS5spd

So between the trickflow and the AFR's which one is the better head? Sounds like the AFR's

As for the hot cam I will be using the 1.6rrs in conjunction with the head/cam set up.

Im really not too worried about what kind of power this set up will produce but would it be safe to say it would put my car somewhere in the 300hp ballpark?

One more thing, I know more about OBDII tunning so proms are a little bit of a forgine thing to me. Where would be the best place to have a prom burned that will be close to if not exactly what I need for this set up. Im not really interested in burning my own at this time.

91RS5spd

Also thanks for your input guys!

91RS5spd

Found these AFR heads for $1,324 Seems to be what im looking for. Would the hot cam be the proper cam to go with these heads?


83-AFR-1038 AFR 195cc SBC Cylinder Heads CNC Street Ported with 74cc chamber assembled with 2.02" / 1.60" Valves, Dual Coil Valve Springs(.550" max lift) and Steel Retainers. (L98 Angle Plug)

91RS5spd

got some specs here between the LT4 hot cam and a Comp Cam, cam.

LT4 hot cam 218/ 228, .525 / .525 112 LSA
CC..............230 / 244, .510 / .540 112 LSA

heres a question, which one is the better preforming cam? which one will have more loop at idle?

gmgod

The comp will make much more power, but neither one is suitable for tpi.

91RS5spd

Ok, suitable isn't really a big concern. As long as it isn't TOO big im fine with it. Acutally im ok with loosing some drivability to a nasty sounding cam (call me crazy).

Pretty much im not trying to get max potential. I have a modded LS1 that takes care of my need to go fast. All I want is to spend some money to bring up the preformance of the TPI to make it stop getting in the way of it's self. So what concerns should I have with the cams im looking at?

KiLLJ0Y

iTrader: (1)

is that 1300 for a complete set of AFR 195's??? i thought that was for the 180's?

the CNC trickflows are better than the 180's, but the 195's are better than trickflows , and last i checked the 195's are 2k


or am i wrong and the prices have since fallen and i didnt know about it?


91rs if you dont care about how much power it will make.. get a set of corvette aluminum L98 heads .. which are better than your stock heads.. and use those..

if you're going for serious power then do the AFR's or something along that line... no sense in spending a crap load of money if you dont need too. the HOT CAM is a good cam for TPI... there is a guy in the socal board using aluminum vette heads, LT4 hot cam, and tuning and ran 12.80, he's also the moderator on the CA board.. his car still is CA legal and has all the smog crap on it too.

91RS5spd

From what I under stand there are two 195 heads for AFR the street and compitition. The Comp 195's are about $2,000 but the street are $1,300

I don't consider money to be a issue. Im spending a year in Korea and coming back $12,000 richer so $1,300 for a new short block and what ever the heads and cam are is no big deal.

gmgod

Yeah, the street heads are $1300....... 180's or 195's. I just don't understand the difference in the two, the 180's I received are cnc machined throughout all the runners. Is the compitition series just a different program or what? That would'nt make much sense monitarily from their point of view.

KILLJOY, Is the guy running 12.80's using stock or stock type tpi, or is he using a super, stealth, or miniram?

87TPI350KID

AFR Have heard nothing but horror stories.

gmgod

Like what, being the best

1989GTATransAm

iTrader: (3)

To GMGOD

He is running modified TPI like I'am. I know him too as we are in the same club.

Slow89Iroc-Z

I would not go with the74cc chambers.....you will lose a bit of compression....get the 68cc version

Guest

AFR has had issues of all sorts over the years, pick the item and I'm sure they have covered it. I think the biggest 'mistake' was the cheap rocker arm studs. Not what you'd expect on a relatively expensive out of the box head. That and their 'finish' work leaves much to be desired. I spent 2 hours on a mill cleaning up their leftovers. Havent heard anything bad lately about the parts, but all it takes is one bean counter.

Results are an entirely different subject. I havent heard a complaint there yet.

Doug Gulley

I've got a 383 with the AFR 195's and a Comp cam very simular to the LT4 Hot cam. The Comp cam is 218* 224* .495"/.502 on 112* LSA with 1.5 roller rockers.

My AFR's are 66cc (I think) to match my 2 valve relief flattops. I ordered mine directly from AFR. Total price: Just a little over $1500.00 as I had a few other items added to mine.

I replaced the stock rocker studs with ARP's before I even bolted the heads down. That's all I've ever done to them.

I ordered a custom chip from TPIS before I even knew mere mortals had the ability to custom burn chips.

It's my daily driver and it pulls down 20+ mpg when I can manage to contain my right foot.

I'm very happy with this setup!!!!