LS4GXP

iTrader: (2)

So Finally after 2 long months of waiting i received my AFR heads. The short block has been sitting waiting to get paired to these lol

I just got off the chat site with Comp Cams. I know we have discussed a cam/rocker/intake before for my build, but i just want to see what you guys think about what they had to say. Atilla ( am pretty sure your going to chime in ) you said the 230/236 was a good base to start off from.

They recommended these lifters, i was also looking at the vmax oe lifters, http://www.compperformancegroupstore...&Category_Code=
but if those short travel lifters are worth the extra $200+ i would need a good explanation why i should buy them
And heres the spec on the cam: part # 08-443-8
http://www.compcams.com/Company/CC/c...?csid=191&sb=2
And the rockers, Ultra Pro Magnum 1.52
http://www.compperformancegroupstore...&Category_Code=

Ahhh 1 week to order the rest of the parts, what a long stressfull process! by the time am done i should have just bought a new LS1 and thrown in the damn thing

Orr89RocZ

iTrader: (20)

Depends on what you want out of this motor but I think its a good base to approach 380-400whp and probably peak around 6000rpm. I had a pretty big cam in my 383 that I possibly could give you the lobe/specs information for comp to regrind it. It was only 230 in the intake but 245 on the exhaust. Made a great wide powerband up top peaking at 6250 and holding that power to well over 6500 rpms. Tight 109lsa with over .600 lift. Car ran mid 11's at 119mph on motor alone. Worked pretty good on nitrous too.
Not sure why the big lobe split in duration but my car had a very unique exhaust note to it and gave a wide powerband. I kinda miss that sound. I had a lot of people give me compliments on it.

For cheap lifters that work well go with LS7 lifters if this is an OEM style roller block. 120 bucks for a set. My buddy has taken these to 7500 rpm in a 4.8 LSx turbo motor making 700whp. I've been to 6800-7000 with my 383. AFR's have light LSX style valvetrain so you can get away with good rpm with hydraulic lifters if the spring pressure is well matched. But you dont need to on your build if you arent looking for a high rpm screamer

Mr. Notorious

iTrader: (1)

I pretty much just went through the exact same thing. Just got my parts in last night.

The biggest difference is the cam. What RPMs were you looking for your power band to fall into? I bought the same lifters, although I heard good things about the LS ones I didn't feel like tracking them down.

I went with a small base circle custom grind cam to increase the clearance for the rods since I didn't assemble the rotating assembly and don't feel like re balancing it after grinding on the rods if needed.

LS4GXP

iTrader: (2)

97' roller block

Picked 1.52 just based of what others have said here. how much more gain we talking with the 1.6's? anything different i need to get to run those?

Power band originally i wanted 6500, but then came to realize i dont want to spend a fortune on valvetrain system so i settled for 2800-6200rpm.

Goals are non daily driving street/strip, 118-120mph traps on motor, Orr hit it on the nose, mid 11's. Hoping i can manage it, if not oh well, i tried lol

how streetable was your car orr? And yes, next year the bottle will go in, probably a 100 shot.

Orr89RocZ

iTrader: (20)

My car idled very mean, but was very stable. Drove like a baby. It was very streetable. Only problem i had was that the exhaust sat too low under the lowered car and scrapped on alot of stuff limiting where I could take that car It was a decent high compression motor and pretty loud. With 4" single exhaust you cant do all that much to tame it down.

It was all MAF based tune in open loop. That car actually got very good mileage. Ran 180 deg on hot summer days with 170 T-stat thru the stock radiator. Stealth ram intake and AFR 195 heads.

3600 stall with lockup so it drove like stock once locked up. No bucking surging or anything. Lock up converter at 25 mph and lug up a hill at 1200 rpm with 3.42 gear. No problems at all. The tuning makes the difference. Spend some time on it and it will treat you well.


Do your AFR's have the 8019 spring? If not you can upgrade to those springs and ship the 8017's or whatever spring is on there back to AFR. I did that for 100 bucks. Shimmed them up a slight bit for 165lbs on the seat to better control the rpms. Bought ARP rocker studs to replace the 3/8" ones on the AFR's. I think i have 7/16" now which are stiffer/stronger but i'd have to check. Its been awhile.

Dont need much in the valve train to control 6500 rpms. Cam it to match 6200-6400 rpm peak and shift by 6500-6600 you will be fine.

Now the proper designed cam will handle the rpms without problem and without the need for high spring pressures. I'd talk to a custom grinder like bullet, mike jones, maybe even cammotion, or UDHarold over at speedtalk.com. Give them the combo and goals and spring pressures you intend to use and see what they come up with.

1989GTAtransam has a 369" motor going to near 7000 rpms with a mike jones custom grind 233/233 duration cam with AFR 8019 springs i believe and LS7 lifters.
My friend has taken LS7's to 7500 rpm with a 4.8 LSx motor running a double spring of similar specs and thats under 20 lbs of boost.

The lightweight valves in the eliminator heads make it possible.

LS4GXP

iTrader: (2)

your talking TPI cams, am going carb.

Yes i upgraded the springs with the heads when i bought them.

Am liking the reviews for LS7 lifters, and there 1/4 the price of comp cams. I dont want to rev the motor to 7 grand lol i think ill be happy with low to mid 6k.

140#@1.930 sound right for spring pressure? all greek to me when things get this technical. that cam they chose is a lift of .540 right? make sure am looking at the right spot.

Orr89RocZ

iTrader: (20)

I need to edit my post... I saw 230/236 in your post and assumed you were talking about the XFI cam by looking at that part number. The one in your link is much different Let me start over here.

With a carb, 108-110 lsa is probably what will be recommended. The actual durations wont change all that much for those heads/cubes and rpm range. Just the overlap will change more then likely.

The cam you listed is abit large for this motor. It would work good but it really wants abit more rpm than what your looking for and what you really need to hit your goals. I'd go a step smaller, like the 288 cam which should be 236/242 on a 110. That should work pretty good and still be streetable. The carb tune is going to make or break it. A good quality carb and time spent tuning will make it streetable. I'd still go custom grind if you can because you can taylor the lobes to the exact intake and heads you are using and dial in an exact rpm range.

140lb should be enough. Not sure what spring that is, as the two main hydraulic options are installed around 1.800" height. Not sure if AFR has been quoting different springs but they have the 8017 and 8019 listed. 140 at 1.93" sounds like the 8016 spring which is a fat 1.55" diameter spring. Good for hydraulic roller and maybe even solid flat tappets. 365 open pressures. Will work ok.

LS4GXP

iTrader: (2)

So UPS dropped the package off today at my co-workers parents house. His parents are in there late 60's, so all i exspected them to do was sign the paper. Well the UPS delivery person was a female She used the dolly to bring the box to the steps, then pushed the box off the dolly onto the cement sidewalk. From what the parents said, it crashed pretty good. The problem is the lady didnt want to lift the 60 pound box off the dolly. Now i just prey everythings ok. I called UPS and let them know that they might be replacing my $1600 heads if theres anything wrong with them. I checked them over visually and i dont see any cracks, so hopefully am ok, time will tell

back on topic. the spring upgrade part number is, AFR part #8605, 1.290 O.D. dunno where i got the spring specs i listed before from, thought it was a different upgrade number. I cant find specs on this spring

So your saying the cam they suggested if probably good for upto 6800rpm? confused why there rpm states 2800-6100. I was looking at there dyno sheets with there cams, and i wasnt seeing any impressive numbers for hp, unless my heads are gonna wake it up alot more then what they used. If i can get away with valve float i wouldnt mind bring the rpms up a bit, i just dont want anything to fail. Also note i plan on spending quite a bit of money at a dyno shop to get it perfectly dialed in, spending all this money on good parts and not having it tuned professionally seems like a waste of money to me lol

Orr89RocZ

iTrader: (20)

Thats a different number than what is listed in the spring spec page on AFR's website. May need to ask AFR what the deal is. On the head page, they say for over 6200 rpm use that spring so definately a good spring. Only other spring listed on the site that matches that diameter is the comp 921's which is an ovate wire spring. VERY nice spring and pricey

That 242/248 cam on proper heads/intake setup should pull to 6500 rpm peak and probably hold out to 6800 fairly well. Its got more duration and overlap than my old cam did and my cam had some top end power. I had a custom grind spec'd out for my 383 for a 6500 rpm peak and I got 240/243 on a 108 lsa with high 500's lift. So that 294 will pull.
Comps power ranges strike me odd. 6100 rpms maybe if you used a superram longer runner type intake and didnt have good valve springs. Same with the XFI version 242/248 on a 113 lsa with good lift numbers. Some guys claim it peaks where comp says it does, 6200 ish rpm. One guy with an LT1 355 and good heads/valve springs pulled to 7000 and it didnt level off yet.... Its a big cam but does have decent driveability. LT1 guys claim its more driveable than the old CC306 which is 230/245 like my old cam but on a 112 with less lift. That cam pulls to 6600 on 350 LT motors with peaks in the 6200-6400 range.

That 294HR would be a decent cam for a victor type single plane. Probably be nice with 210 heads as well. I still think the 288HR is a better choice for abit more lower end and midrange, abit better driveability and the rpm range you are looking for.

LS4GXP

iTrader: (2)

so the 288hr, or the custom grind you had, yours was alittle bigger, Am liking your idea because your old 383 is exactly where i want to be.

By the way, love the car, watched the youtube video of it going down the track, Very impressive

Orr89RocZ

iTrader: (20)

My old cam would probably work well with a carb since its got alot of overlap. Most wouldnt run it with EFI and I did just fine. Plus the extra exhaust duration makes for a decent nitrous cam and holds onto top end power so you can extend shift points.

Check my vids for how that 383 ran and how it sounded on the dyno. The beginning of the dyno run you can hear the unique exhaust note alittle bit as he increases rpm around 12 second mark. Had a mustang modular motor sound at first but kinda mixed with a LS1 sound. My turbo motor with same exhaust did not have the same sound at all and I was disappointed. I have yet to hear a sbc car sound like that.

LS4GXP

iTrader: (2)

i like the tone

how did it make you feel that lifted ram was on your doors the whole way down the track lol

Am willing to try out that cam, if you would so kindly send me a pm with the info.

Orr89RocZ

iTrader: (20)

I'll see if i can find the cam card pic when I sold it, but I remember the specs.

It was intense...and sad at the same time...so I think a few weeks later I bought the nitrous kit Nobody was hanging with me then until i started seeing some fast imports and other nitrous capable cars running 10's...so I built the turbo motor

LS4GXP

iTrader: (2)

I suggest our part# HR73360-74341-108
284/296 @.006"
236/234 @.050"
.360"/.341" Lobe Lift
108 LSA

Your Cost: $336.84 +shipping

Just got an email back from mike jones. He suggested the cam above. Sooo many choices and different opinions lol

Orr89RocZ

iTrader: (20)

Thats probably your best bet... has about the ame intake duration and decent lift on a 108 lsa like I figured. The reverse split at .050 is interesting but I'd rock that cam too.

My cam was for an HSR, so it may be different with a good single plane intake and a carb.

LS4GXP

iTrader: (2)

Am gonna be very disappointed if this cam doesnt meet my exspectations lol but i did tell mike mid 11's 118ish was my goal.

wheres the victor jr intake like to be at powerband ya know? i was thinking sacrificing lower end grunt for upper rpm power, seeing my suspension wont be done untill spring.

Orr89RocZ

iTrader: (20)

I reallly dont think you will be disappointed with Mikes cam. The big thing is to have the intake ported out to even out the flow distribution. Victors seem to have some issues with this.

Vic Jr should be good to 7000 rpm and should work ok on that motor. I'm not exactly sure what the range is listed at.