Just wondering what I should pay for a 750 holley double pumper with manifold that's just come off a 351C ED Falcon that was fully worked by it's owner but only done about 80 kms total road milage as it's still an incomplete project. Carby's in pretty neat condition, not sure what kind of manifold, so rough prices please if possible?
Price on a new 750DP is pretty extreme - AUD$800+ I think, and a decent manifold these days is AUD$450+. So I would pay $500 secondhand for something like that if its near new.
Thanks for the prompt reply STROKEXD, it's much appreciated. Out of curiosity, can anyone give a rough estimate (see: educated guess) as to what horsepower rise I'll get out of a 750DP contrary to the stock carby on the engine?
I don't think anyone has really bothered tuning the thermoquad as they are hard to get bits for. If parts where available people would be fiddling with them. On a stock engine a 750DP will drown it. Within about 5 mins the plugs would be toast. If you looking at drag racing and simplicity of tuning go the holley.
I would reckon the Holley 750DP jetted to suit would give you much better mid range response, but on a stock motor the gains over the Carter thermoquad wouldn't be huge.
If you are doing more work on the motor then the Holley would become an essential part.
Thanks again for the help guys. Don't know how much work has currently been done on the engine but it's the 400 HP model from ford muscle parts, it's got a holley on it, but no idea what size but definately not a double pumper.
Bit concerning about the flooding and frying of plugs comment, care to extrapolate a bit more on that for me?
What Brenden is saying is the Holley 750DP out of the box is set up for a pretty hotted up 351. Primary jets are around 71 and secondaries around 80, with a fat enrichment circuit as well.
So fitted 'out of the box' to a stock 351 it will run hellishly rich. Just reducing jet size is not always the answer because this can cause over lean spots as the fuel delivery curve is no longer linear.
But I wouldn't worry too much if you have a 400HP crate motor, it would probably be about right with minimal jet changes.
I can tell you for a 400hp engine the jets should roughly be 74 in the primaries and 79 in the secondaries. Fouling plugs is caused way too much fuel. I wouldn't go below 750DP for a 400hp engine.
What Brenden is saying is the Holley 750DP out of the box is set up for a pretty hotted up 351. Primary jets are around 71 and secondaries around 80, with a fat enrichment circuit as well.
So fitted 'out of the box' to a stock 351 it will run hellishly rich. Just reducing jet size is not always the answer because this can cause over lean spots as the fuel delivery curve is no longer linear.
But I wouldn't worry too much if you have a 400HP crate motor, it would probably be about right with minimal jet changes.
Jetting is automotive wives tale #352
A carburettor doesnt care what size engine is underneath it. A Carby gives a metered air/fuel ratio. Ie at 750cfm it delivers "X" amount of fuel.
Jetting is merely to fine tune and match specific engine characteristics.
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