Rxmfn7

Im now ready to purchase some parts for my LS1 thats going into my '94 Rx-7. I have been researching on this forum for the past few months, and have posted a few questions, but now Im ready to roll and want to get serious with some parts. 1st off, I dont care too much at all about low-end torque. this is going into a 2700lb rx-7 with 4:10 rear end and the 6-speed manual transmission, Im going to be fighting blowing the rear tires off as it is. Im more into road-racing and looking for something that pulls all the way to however high I can safely go. Id also prefer it not to idle like the way most of you guys like it ( no offense, just not my style), but I realize it may be a tradeoff Ill have to accept to make the big power up top. Also, not to throw numbers out randomly, but Im looking for at least 450RWHP from this setup. Im willing to spend the money on quality parts that will last, so any recommendations of what I should be looking into as far as heads and cam? Also, please let me know what else I should be looking for as far as pushrods and valvetrain upgrades. Thanks guys..

PREDATOR-Z

I take it you do not want to lope too hard, if so check out a CheaTR cam and AFR 205 setup. Can make 430rwhp+ and stay smooth while reving to 6800+

Rxmfn7

If I were to get a more aggressive cam/head setup that would make the idle lopey, would putting on a slightly more restrictive muffler to quiet it down choke it enough to negate the gains Id get from the setup? Example say I can make 430whp with the setup you suggested, and went to something larger that I can make 450whp and get a few more rpm from, and then threw on a quieter muffer, would that choke me off badly enough to be about the same power?

LS1IMPULSE

iTrader: (42)

Honestly I didnt know the cheatR could make that much power, but have never researched it, and predator is usually right so i would go with what he said. Of course you can keep going after that with bolt ons 90/90, pulleys etc... and im sure you can make it to 450

Rxmfn7

Yes i understand he knows his stuff about cams and I respect his info alot. That being said, the cheaTR looks like a pretty mild came with the 117LSA, just worried it wont have the pull up top Im looking for. How do you feel about the TRAK cam, which is specd at 231/234 .640/.590 112 LSA . I understand the 112LSA is going to give me the lope I dont really want, but it should make alot more power? Is this cam going to be too hard on the valvetrain, and will I have to do any flycutting?

I am also going to be using a FAST 90 intake with a 90mm TB, longtube headers and pulleys.

PREDATOR-Z

The CheaTR will make the power up to without ill effect of too much overlap.
It also makes nice power under the curve.
AFR's will have to be milled with the right gasket thickness for proper SCR/DCR. This is very important.
The TRAK say it in title, it is more of a track cam and has more lope (much more).
Now there are other options in between like 224/228 or 228/232 etc...
If you wish to find out more about CheaTR or Track cam combo, PM PatrickG he has pioneered both.

Rxmfn7

Thanks for the info. One more quick question about the heads you suggested. Are those AFR 205 heads comparable to the PRC LS6 CNC ported heads? Just wondering why the PRC LS6 heads are about $1000 while the AFRs are double that. If there is a huge difference, could you give me a quick rundown of why?

PREDATOR-Z

Yeah, AFR are aftermarket custom castings with only 205cc intake runners, velocity is very good as well as quality, increase deck height etc...
PRC are stock castings, ~235 cc.

Apple to apple swap has not been done yet so to say 100% that one will out do the other is pure speculation, BUT in general AFR setups have been consistant in flowing advertised numbers as well as power outputs.

Search and you'll find Tony Mamo's post about a 224/228 cam/AFR combo putting over 480rwhp on stock cubes/ M6.
I've yet to see a stock cast head duplicate that.

now if you're looking at bang for $$ then yeah PRC's and Patriots are some of the best deals around.

Another contender is the new Edelbrock Terminator heads but they are close to AFR price. Those have yet to be fully tested on multiple setups (not enough feedback) but the results so far look very promising.

allngn_c5

iTrader: (3)

AFR 205's milled to 59cc (MUST FLYCUT) and G5X3, but you will have a bit of a lope unless you set your idle to 1000 rpms and then she's quite smooth. The AFR's are definately worth it. I have watched other people do similar H/C setups and not make the power I am making. AFR's port velocity is unmatched, and flows the numbers that the hogged out ported heads flow, but the mixture is rammed into the cylinder because of the shape and design of the ports. AFR's are beautiful and worth the money especially if you ever want to spray. Good luck on your choices.

allngn_c5

iTrader: (3)

Almost forgot to post a plug for the boys at LG. They have a sweet *** Head/Cam pkg for around 2995.99 The pkg includes AFR 205's w/62cc milling extra and your choice of the G5X series cams. X1,2,3, or 4 I'd suggest the X3. Its like another 1200 or so for all the necessary valvetrain upgrades. Titanium seats, Comp 921's, Hardened Push Rods. Might as well get the Comp R lifters for another 200. Give Bobby a call and tell him Doug sent ya for the best pkg price available.
Again good luck.
**************Prices subject to change***************

Patrick G

iTrader: (14)

Sounds like you want the AFR cam made specifically for a 346 running AFR 205 heads. Tony Mamo spent months developing this grind to make exception power without harsh lope or poor drivability.

224/228 .581/.588 114LSA +1 advance

It's what you'll want. It will make more power than the CheaTR cam if you're running a good exhaust.

Rxmfn7

Thanks for your input, much appreciated. Is there anywhere that carries that specific cam or will I need to call and have it made?

eamador11

I agree...

Rxmfn7

Was your car tuned after your head/cam install? Are you using stock injectors? Do you happen to have a dyno sheet or WHP number?