How many rpms do you guys think is safe on my 383
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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
thanks
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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
I'd say 6500 rpm should be fine, IMHO
Derek
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Originally Posted by Villain281H
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
I'd say 6500 rpm should be fine, IMHO
Derek
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
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Originally Posted by 68birdls1
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
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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
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
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Originally Posted by Villain281H
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
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
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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.
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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.
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Originally Posted by slow trap
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.
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Originally Posted by rcfast
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.
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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.
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.
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Originally Posted by 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.
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Last edited by rcfast; 05-12-2005 at 10:06 PM.