t/a-speedfreak

Hey guys, I am going to order the First intake system for my 69 camaro.

I currantly have a RPM cam which sounds mean as hell but since the cam isn't computer friendly I will have to change it. I will buy roller lifters and cam to go with the system but I would like to have a choppy idle or at least something you would expect from a 69.

I've narrowed down the cams I am interested in to either the comp XFI268 or the CC503. The videos of the CC503 sound great. The cars all have that choppy idle that is expected from a 69. Not sure they make a CC503 for the early style block.

The engine is a street driven 355 with 9.5 to 1 comp, edelbrock 739 heads, 1.6 rollers, and of coarse, long tube headers backed by a 4 speed and 411 gears.

I don't have too much experience with cams for the TPI's, mostly I have dealt with LSx cams, so a little help as to which would sound better would be welcome.

Air_Adam

The GM#847 is pretty popular with the LT1/LT4 crowd... good power and torque, sounds raunchy. GM#846 is a little bit tamer, but still a very healthy cam.

t/a-speedfreak

Thanks, I'll check them out.

t/a-speedfreak

Listened to some cam clips and the 847 sounds mean.
I don't think the RPM range is really great for the first system but for my type of driving it might be ok. I noticed they are ground by crane. The 847 is made for the 86-9x something blocks and I have an early block. Crane carries them so its not a big deal.

Air_Adam

They are listed as '87+ because they are designed to be used in the factory roller cam blocks, like the L98 and LT1. I don't see why you couldn't use it with a set of retrofit roller lifters on an old style block?

The 847 is a personal fav of mine, I've driven an LT1 car with that cam and it sounds gnarly, and makes tons of power from about 2500rpm and up. Not the best powerband for a TPI car, but you could make it work with the right heads and intake mods.

The LT4 hotcam is also a popular choice of the TPI crowd and it sounds really nice too. Has a better powerband for a TPI engine too. Doesn't sound as rough as the 847, but still has a fair bit of lope.

Orr89RocZ

iTrader: (20)

847 is huge for a mild 355 with TPI. I'd go 846 cam. Comp does have the 503 cam for old blocks i believe, basically XE276HR grind. they have it in retrofit as well for non roller block conversions to roller. They also have it on 110 lsa for more lope

GTA Sammy

iTrader: (1)

Mines a little choppy...... LPE 211/219 it's a roller cam with .536/.560" lift
The car is not quite warmed up yet....on the first vid (in the driveway)
The second vid (@ the dyno) the car is completely warmed up.

http://www.youtube.com/watch?v=iZl4g...e=channel_page
http://www.youtube.com/watch?v=nATv0...eature=channel

t/a-speedfreak

GTA sounds nice on the dyno and not too tame. Looks clean too.
I looked into the CC503 but so far it looks as if it is only for the later blocks. They have a similar cam that is retro fit but the rpm band is a lot lower as well as shorter. The reason you can't use a later cam in an early block is the difference in the nose of the cam. The cams for the roller blocks are steaped or something like that.

As to the gm cam being huge for a tpi, the first system is a lot bigger than stock but I hear what is being said.

I like to drive my car and put my foot on the pedal. I enjoy occasionally racing my shadow and smoking the tires. Peak performance won't be too much of an issue.
Thanks for sharing your time guys!

GTA Sammy

iTrader: (1)

Thanks....

Your Camaro looks very nice!!!
I've always had a place for those soft-tops

Good luck with everything, and welcome to TGO......

87transGTA

hey on either one of those cams would computer tuning be necessaryy?

Orr89RocZ

iTrader: (20)

yes tuning would be necessary... its necessary for any cam really even tho mild cams can run off stock MAF setups ok at times. But stock motors benefit from a tune so a cammed motor would benefit even more

The FIRST system is huge compared to stock TPI and even aftermarket big tubes but its still a long runner design and wont support high rpm like a LT1 motor. GM847 is a big cam. Trust me. I run a similar cam in my 383 stealth ram and its a big cam. Runs pretty good in a 383 but a 350 with lower compression it wouldnt run well at all.

Leave the 847 cam for the LT1's and 383's. 846 is nice but both of these cams are newer style cams anyway and wont work inthe old block

you'll have to get a retrofit cam regardless. And dont worry about the advertised rpm bands on those cams. the XE276 is the same as the 503 cam but just different lobe seperation. I'd run that XE276 224/230 retrofit cam on a FIRST injected 355 anyday. its the largest cam i'd use on a TPI setup

Air_Adam

Absolutely. The 847 is a huge came for an engine smaller than a 383, and the 846 is only one 'size' smaller than the 847. If I remember correctly:

847 - 236/242* @ .050, 112LSA, lift around .575 though I cant remember exact figure.

Thats even bigger than the flat tappet XE274 in my '83 350. Lift bigger by almost .100" and duration is bigger by 6* on each side. And that XE274 is a pretty big cam in my 10:1 350. Most smart 6-spd LT1 guys won't use that cam with less than 11.5:1 compression and a 4.10 gear, whether 350ci or 383ci, because the low rpm power does get soggy. That cam needs to spin to make real power.

[michael caine voice] But it does sound bloody fantastic... [/michael caine voice]

t/a-speedfreak

Just noticed the Michael Caine voice. Slick man, Slick.

bart91406

"Racing my shadow", I like that, now when I take my car for a drive I can tell my wife what I was doing!

t/a-speedfreak

Your wife will still have her doubts unless she's with you!