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  1. #1
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    Calling Rover V8 experts.

    I want to build a 3.9 hi comp engine for a daily driver , manual gearbox probably std. camshaft. What way would you go- 390 Holley or Rover Fuel Injection? With the ever rising cost of fuel I need something not too thirsty.

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    Official RnS Addict fozwanger's Avatar
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    Ask v8ian......

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    Off the Xmas card list kapri's Avatar
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    Not an expert but I've always gone with 390 Holley on a decent dual plane manifold ( like Edelbrock Performer or JWR ) NOT Offy . With the right gearing ( 22 mph /1000 rpm ) I used to see 30 on a run on a 3.5 with Hurricane cam , headers ,and mild port job.

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    Quote Originally Posted by kapri View Post
    not an expert but i've always gone with 390 holley on a decent dual plane manifold ( like edelbrock performer or jwr ) not offy . With the right gearing ( 22 mph /1000 rpm ) i used to see 30 on a run on a 3.5 with hurricane cam , headers ,and mild port job.
    just curious kev why not the offy in your opinion

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    Off the Xmas card list kapri's Avatar
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    The Offy is a 3000 rpm upwards manifold, low end flow is poor, the other 2 feature split inlet runners meaning better air fuel velocity / atomisation .This leads tobetter bottom end pick up and economy.

    The Offy gained popularity because it was once the only manifold you could buy and are fairly readily available secondhand. The other 2 will pay for themselves with the performance gain and better fuel return.

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    Official RnS Addict farncombe pop's Avatar
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    Should make it clear that Kev is saying stay clear of the offy 360 as the jwr duel plane was still an offy but much better,
    Here to help !

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    Official RnS Addict v8ian's Avatar
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    injection, its easy to wire only 4 wires once the loom has been seperated, better performance on a stock engine, the only extra thing you would need is a return line to the tank,

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    Off the Xmas card list kapri's Avatar
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    If you want an injecton set up a mate has a complete one for sale for £70 ,no idea what it came from but could get pictures if it matters.

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    Official RnS Addict harris66's Avatar
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    i used the webber carb set up on my last rv8, brand new 4 barrel, with edelbrock manifold was superb, fired straight up out the box, minimal tweaking to get the mixture spot on and never faultered

    injection as said above is simple to set up and looks good i reck, for an everyday user probably the cheapest and best way to go
    i want cubic inches! lots of em!!

  12. #10
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    Thanks for the info guys ,I assumed in my ignorance that the lower profile manifolds were about the same. I'm thinking that the holley would be best for me as I'm used to them and injection might give me problems I can't fix myself. Looks like a 390 on top of a dual plane manifold for the lower RPM range would do me for now and if it can do 25 MPG that will be a bonus













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