Originally Posted by wilf
Hi Wilf, the 500 is OK for even a bog stock 3.5 lump, Jim of JRV8 fits them to his turn key engines. I think that the priamries are smaller than the holley 390 so the motor "see's" it as a small carb until the the secondaries come in. The secondaries as you know are half mechanical, half vaccum. (I removed the vac bit on my carb and went for a spin....it was bloody terrible!).
I would definately do the "drill mod" to the manifold just behind the stat and also fit a 74 degree stat. The lump will then run at 80 degrees.
The 500 really does need a thicker set of needles, 67x55. Once that lots done (30 minutes work in total including the drill mod) you can fit then manifold, an insulator, and then the carb and "bobs your uncle"
The Thunder series 500 looks very interesting....more knobs to fiddle with!
Sideoilers post is interesting, everyone quotes figures over 200 BHP for the 3.5 but mine which also had typhoon (hotter than the hurricane) fitted and it only made 177 at the fly. (It was a bit knackered though and the timing was probably miles out!)
Real steel really take the pi55, they quote something daft like 254!
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If it's fast and cheap then it's not good.
If it's cheap and good then it's not fast.
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