Stroker 1500

iTrader: (1)

I was told by a couple people they thought 6800 and a couple others said 6500 was probably safe but not much more than that. I know my valvetrain will handle that high the only thing i have in question is the bottom end. The bottom end is a 4340 callies stealth crank, crower 4340 sportsman rods, and kb hyperutectic pistons on a 2 bolt.. The cam im running is the cc306 so its going to like a little bit of rpm, just wondering what your guys thoughts where.

thanks

Villain281H

iTrader: (5)

I'm not sure what the specs on a cc306 is, but I have a crane solid 518/536 lift 228/238 duration that I shift at 6500 rpms. My bottom end consists on eagle cast crank and sir rods, TRW forged 2-valve relief flat tops, canfield 195cc heads, victor jr intake and 750 hp carb. The cam is the limiting factor on my combo, but I'm waiting to upgrade my suspension and get my convertor re-stalled to allow for a bigger cam.

I'd say 6500 rpm should be fine, IMHO

Derek

Stroker 1500

iTrader: (1)

your running a 383 on your nova? also is it a 2 bolt?
Cam specs are:
Valve lift .544 I .578 E w/1.6 rockers
290/307 duration at .006
229/245 duration at .050
112 LSA

68birdls1

iTrader: (46)

on my cam: 260 duration at .050 with a .555 lift on intake and exhaust with a 110 lsa, shift it at 6400 rpm. hypereutic pistons aswell but mine is in a 1970 350 4 bolt

Stroker 1500

iTrader: (1)

ok, i guess i will just have to see where mine makes power. if your shifting at 6400 with a 350 that means my shift points should be even lower since its a 383 and it has a smaller cam on top of that.. still wondering what the thoughts of the safe rev limit would be for my lower

68birdls1

iTrader: (46)

well i could probably shift mine at about 7000, but that is the absloute most! i would not wanna go any higher than 6900.

Mangled03gmc

iTrader: (95)

67 68 tops all though i have seen people around my way with them shift at 7k-7200.That is with all the goodies though.

smask04C5

iTrader: (1)

See where power starts to fall off, shift 200 rpm below that value.

Villain281H

iTrader: (5)

Yep, a 383 (actually 388 inches b/c of a .060 overbore) is what currently sits in the Nova, but it a 4-bolt block.

I'd say you could easily see 7 grand based on the cam, but the other limiting factors will be the heads intake and carb. I shifted the same cam I have now in a 355 combo at 6700 rpm, and we even dyno'd it to find where the power dropped off. The 6500 rpm I shift at now is based on a combo of time runs and dyno information.

Make some runs and see what it likes.

Derek

Stroker 1500

iTrader: (1)

Alright i will have to see how it runs. Its fuel injected btw but its not going to have the stock fuel injected manifold on it.... also Im running vortec heads on there with bigger exhaust valves that are under cut along with under cut intake valves. Has a full pocket port and ported exhaust ports I know it could probably see 7 grand. My only concern is can it see 7 grand and still have all 8 rods ... Ill let everyone know how it does, i plan on getting everything in hopefully in 2 weeks. Might be a little longer because im waiting on a couple parts that im dependent on to get it done. I hope to get the cam tuned in within a couple weeks after that and hopefully some dyno and track time after that.

ProStreetZ28

iTrader: (2)

It's been my exp that the CC306 will pull to about 6500, but the hyd. roller lifters don't like to spin higher then that, I know they will but it takes a a strong valve spring or a hydra-rev kit. After installing the hydra-rev kit it'll spin 7K no problem with the CC306, but that is on a blower car, the CC306 on an NA engine might not pull that far.

Wnts2Go10O

iTrader: (12)

with a 2-bolt id be scared to go past 6500 but a splaayed 4-bolt with your setup and a niice valvetrain you could easily see 7k trap rpm

slow trap

iTrader: (22)

i'd say with that size cam you shouldn't have to shift past 6500 so i wouldn't worry about how much rpm can you turn but how much rpm you need to turn.i had a 406 with a cc 306 solid roller that i shifted at 6000 so 6500 should be close for a 383.

Stroker 1500

iTrader: (1)

thats the reason im asking. i want to make sure what i need to turn isn't passed what the bottom end would like. for example if my bottom end wasn't safe to spin past 6000 but i made peak power at 6300 and shifted at 6500 there could be problems.. i mean my rods have a power range of 550 hp and a rpm range of 8200 and I belive the crank also has the same rpm range with a higher hp range, but i know if i ever tried to get there parts would be all over the ground.

terr1bleone

iTrader: (1)

well my sbc goes to 8200, lol. but hyper pistins can last up to 7k for breif periods, and after about 6500 in a 2 bolt you start to get crank walk. so i wouldnt go past 6300 for safe measure. i wouldnt be worrying about your rods or crank. mabye valvetrain float of you have a hydraulic roller cam/hydraulic flat tappet cam. also if your going to that rpm its better to build up to it in a higher gear, dont just rev it that high in a burnout or something. i broke a kb piston when reving to 7k on stock rods/crank.

blue66

Your bottom end will handle 6500 no problem, only limiting factor is the 2 bolt block.
Used to shift a 2 bolt 350, stock botom end cast flat tops @ 7500 for 2 yrs, never a problem. Had a solid lifter cam though. Unless your are spraying your engine I would not be worried at all.

Mangled03gmc

iTrader: (95)

speed-o-motive sells a blown 383 stroker that is still makin power at 7200. go figure

FastRedChevy

6500 is probally ok but not needed. That motor is done making its power just under 6000 RPMs, 5000 or so if your using the l31 intake for the vortec heads.

Stroker 1500

iTrader: (1)

key word... if your using the stock l31 intake , also did you see the size cam thats goin in?

FastRedChevy

what intake are you using then?

A l31 would kill the power of that engine.

Cam size dont mean a damn thing if you dont have the right stuff to back it up.