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Thread: 308 build

  1. #16
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    Quote Originally Posted by CrustyHK View Post
    Thanks for the info guys I do appreciate it.
    What if I tackle this slightly differently then. The current pistons are standard dish tops. What if I throw some more $$ at it and fit new big ends, mains and a new set of flat tops. Then said I have 2k to spend. Disregard extractors in that 2k.
    I’m then left with what to do with heads manifold and cam. It’s got a quadrajet now and there seems to be a real love hate relationship out there for them. I get that a holley is a big chunk out of that budget but if the consensus is I’m wasting time with a quadrajet and need a Holley I’ll find the $$ for the Holley.

    I’m an old bloke and don’t need to be shredding tyres but would like a strong reliable engine.

    Cheers
    If you intend changing the pistons to flat top, source some 304 pistons as they have a different compression height which raises the piston in the bore and can eliminate the need for decking the block,,,,assuming the block has not been previously decked.

  2. #17
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    Quote Originally Posted by CrustyHK View Post
    Thanks for the info guys I do appreciate it.
    What if I tackle this slightly differently then. The current pistons are standard dish tops. What if I throw some more $$ at it and fit new big ends, mains and a new set of flat tops. Then said I have 2k to spend. Disregard extractors in that 2k.
    Iím then left with what to do with heads manifold and cam. Itís got a quadrajet now and there seems to be a real love hate relationship out there for them. I get that a holley is a big chunk out of that budget but if the consensus is Iím wasting time with a quadrajet and need a Holley Iíll find the $$ for the Holley.

    Iím an old bloke and donít need to be shredding tyres but would like a strong reliable engine.

    Cheers
    Another option is to buy a complete running efi 304 and put the entire efi top end on the red bottom end (ideally with flat tops and a small cam). This would give you an extremely reliable package with a fair bit more poke then the existing red and will be a pleasure to drive. By using the existing red bottom end you won't need things like catalytic converters for registration.

    If you're not really after much more power, raise the comp on the existing engine (flat tops and/or skim the heads) and fit a small cam. Fit a set of headers along with a factory HEI distributor and get someone to tune the QJ to suit.

  3. #18
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    By using the existing red bottom end you won't need things like catalytic converters for registration

    this is a good very point,,, by not changing the block, there is no need for Gumbyment interference....always a great thing!

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    Ok so Iíve picked up a pair of VN heads and will use flat tops. What manifold should I be looking for?

  5. #20
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    If you want to keep it under the bonnet you can use a Redline single plane or an Edelbrock Performer RPM Air Gap (dual plane) The Edelbrock is the cheaper of the 2. Harrop and Torque Power both do dual planes as well that will fit but they are considerably more expensive than the Edelbrock. If you're not worried about having it come through the bonnet (or you have a scoop) you have plenty of other options although a lot of them won't be really well suited to a mild 308 IMHO.

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    Quote Originally Posted by CrustyHK View Post
    Ok so I’ve picked up a pair of VN heads and will use flat tops. What manifold should I be looking for?
    304 flat tops?

  7. #22
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    Quote Originally Posted by hq308 View Post
    If you want to keep it under the bonnet you can use a Redline single plane or an Edelbrock Performer RPM Air Gap (dual plane) The Edelbrock is the cheaper of the 2. Harrop and Torque Power both do dual planes as well that will fit but they are considerably more expensive than the Edelbrock. If you're not worried about having it come through the bonnet (or you have a scoop) you have plenty of other options although a lot of them won't be really well suited to a mild 308 IMHO.
    starting to get the thought that this one is leaving the ''mild'' category build

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    Quote Originally Posted by desoto30 View Post
    starting to get the thought that this one is leaving the ''mild'' category build
    Yep.

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    Quote Originally Posted by desoto30 View Post
    304 flat tops?
    I havenít ordered flat tops yet. Iíd need to be sure this block hasnít already been decked before ordering the 304s. I couldnít find a great deal of info on the 304s in a 308 either

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    Quote Originally Posted by desoto30 View Post
    starting to get the thought that this one is leaving the ''mild'' category build
    Yep

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    Quote Originally Posted by hq308 View Post
    If you want to keep it under the bonnet you can use a Redline single plane or an Edelbrock Performer RPM Air Gap (dual plane) The Edelbrock is the cheaper of the 2. Harrop and Torque Power both do dual planes as well that will fit but they are considerably more expensive than the Edelbrock. If you're not worried about having it come through the bonnet (or you have a scoop) you have plenty of other options although a lot of them won't be really well suited to a mild 308 IMHO.
    Yes needs to stay under the bonnet if possible.
    Are the single plane manifolds designed to produce power at high rpm and the dual at lower rpm?
    Iím being told to flow these VN heads to determine the manifold and carb but I would have thought all the VN heads would flow the same.

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    Quote Originally Posted by CrustyHK View Post
    I haven’t ordered flat tops yet. I’d need to be sure this block hasn’t already been decked before ordering the 304s. I couldn’t find a great deal of info on the 304s in a 308 either
    I don't know that you will but I can tell you they work and put the pistons up about 0.020" in the bore from a std 308 piston.

  13. #28
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    If theyíre stock VN heads thereís no need to ďflowĒ them. As far as manifold choice it depends on what you want most, the dual plane should give you a little more torque down low where as the single will give you a little more top end hp. The Edelbrock Performer RPM Air Gap is a good all rounder in my experience.

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    Quote Originally Posted by desoto30 View Post
    I don't know that you will but I can tell you they work and put the pistons up about 0.020" in the bore from a std 308 piston.
    I did find a little info in the end and youíre right they are right on .020 taller. I checked the deck clearance yesterday and the existing standard piston is .040 down the bore so with the 304 pistons Iíll still need to deck the block

  15. #30
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    maybe, depends if the pistons compression height is where it should be now. a 0.020'' shim gasket [if they are available for holden] and the theoretical 20 you deduct puts you where you need to be.

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