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  1. #1
    Casual Smoker V8ME's Avatar
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    Default 304 with stock cam rpm limit.

    Just wondering what a stock 304 can rev to with better valve springs. My car feels like it could pull more revs but it valve bounces at 5700-5800rpm. Will lt1 springs let it rev a bit more. It still feels like its pulling well then it starts valve bouncing. It has a single plane manifold and 600 holley, pacemaker extractors.

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    Do you ever leave? paulzig's Avatar
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    Well if it isnt losing power and all its doing is valve bouncing there is a good chance it could go more.... The single plane and extractors will help it rev out more than the stock intake/exhaust.

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    Is it a VK-VL or VN-VSIII engine? VK-VL are all the same cam except for VK Group A from memory, and IIRC VN-VSIII are the same cam all the way too except for the final roller cam engines (and the HSV versions of course). Stock heads if earlier engine?

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    Casual Smoker V8ME's Avatar
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    Its a vs engine with carb on it. It pulls pretty good then just hits a brick wall at about 5800ish i assume its valve bounce, the motor just starts sort of stuttering and fluttering at those revs. Or could it be lifters not handling high revs.

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    It's probably peaking before 5k if it's stock. No real point revving it more.
    But with your single plane, carb and headers it would definitely have more with a cam (and spring) upgrade.

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    It could also be the fact that with the stock cam and the really low compression these have (about 8.4:1) that 5800rpm is about all it can manage. Remember that in earlier carbied Holden or Torana 8.3:1 was regarded as the "low compression" or standard fuel engine. A HG-HJ or LC-LJ 173 low comp was 8.3:1, and a HD-HG or LC 161 low comp engine was 8.2:1. Your VS engine was designed to run on 91 ULP which isn't far removed from the old standard fuel. If you are running it on 98 and make it operate at higher rpm you really want more compression and a bigger cam (and springs). Others here are far more knowledgeable on these engines that I am though, and you'll get good advice.

    What ignition are you using on it? Hopefully at least a VC/WB-VL HEI with a HEI coil and 12V run to the coil. It is possible your ignition is compromised in some way.

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    Do you ever leave? EH179's Avatar
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    If you get 5800 out of factory springs, you done well. That will most likely be the problem.

    The lifters should allow 6000 rpm easy, so cross them off.

    What fuel pump setup?

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    I have a factory (read totally stock except for exhaust system) VS V8 Series 2 sedan, factory 5 speed manual and although it will hit the rev limiter (5750rpm) after 5000rpm itís just making a lot of noise (Grouse V8 noise) and not pulling as hard....

    If you want more rpm you need to upgrade Cam and valve train, compression, intake and exhaust.

    I reckon you are already getting the most out of what you have, give the thing a break mate.

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    Casual Smoker V8ME's Avatar
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    I got a vp calais thats about the same rev limit 5700, it was all over at 5000rpm then i got an ace performance tuning chip in it and it still has pull to nearly 5500rpm. The banana manifilds kill em. My hq has the same motor with a single plane manifold, 600 holley. And early bosch style dizzy. And it pulls heaps more than my vp after 5000rpm.

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    Casual Smoker V8ME's Avatar
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    It feels like it could keep going to about 6000rpm. But it starts doing the valve bouncing sounding stuff at 5700-5800. I dunno, maybe i am expecting too much. For $100 i guess it wont hurt to put lt1's in it and see what happens.

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    Do you ever leave? EH179's Avatar
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    How do you know it's not running out of fuel?

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    Quote Originally Posted by V8ME View Post
    I got a vp calais thats about the same rev limit 5700, it was all over at 5000rpm then i got an ace performance tuning chip in it and it still has pull to nearly 5500rpm. The banana manifilds kill em. My hq has the same motor with a single plane manifold, 600 holley. And early bosch style dizzy. And it pulls heaps more than my vp after 5000rpm.
    What is it in? An early Bosch distributor is a points dizzy, and they were never designed for anything much over 5500rpm. GMH made a dual point twin coil version (2 x 4cyl dizzys essentially in one) for the L34. Only much later did they put a HEI dizzy on the Holden V8's.

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    I had a harrop and carb on a stock vr 5.0l with little cam 218@50 . according to the cam card it was supposed to make power to 5200 but on the dyno it peaked at 5700. go figure?

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    Quote Originally Posted by 355OVB View Post
    I had a harrop and carb on a stock vr 5.0l with little cam 218@50 . according to the cam card it was supposed to make power to 5200 but on the dyno it peaked at 5700. go figure?
    They figure the RPM ranges usually with stock or whatever intake they have a result for. Not knowing what you have they put an RPM range out there as a best guess.

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    Quote Originally Posted by HK1837 View Post
    What is it in? An early Bosch distributor is a points dizzy, and they were never designed for anything much over 5500rpm. GMH made a dual point twin coil version (2 x 4cyl dizzys essentially in one) for the L34. Only much later did they put a HEI dizzy on the Holden V8's.
    Its an electronic vk vl type dizzy.

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