Holley Sniper

[AndrewA]

I've got the car that was Mr P's - I get 18 mpg running around locally and around 25 mpg on a run.
That's with a 318, the gearbox with overdrive and lock up, new Edelbrock 500, rebuilt top end, electronic distributor, 2.8 rear, flat as a pancake cam and a fair amount of time on rolling road getting it all spot on.
Good luck with the efi!
Cheers
Andrew

[Thor]

That is a good result. By today's standards a 410 is not a heavy car and the relatively small frontal area of a Bristol makes it (quite) aerodynamic, but a 5.2 litre petrol engine has certain limitations ! With a good deal of fiddling about a Sniper OUGHT to be able to do a bit better, but it is quite a challenge.

[AndrewA]

Thanks - when the heads were off the chap that did them spent a lot of time getting them to flow as well as possible. The engine's quite poky - I'm apparently getting 245 brake at the wheels but have spent enough time with various cars on different rolling roads to know some are more generous than others!
The flat cam suits the car well btw - although the hot rodder part of me wouldn't mind a bit of lope!

[Green411]

A bit of lope on a cam does sound good in the right car, but as you say a Bristol may not be the right home for such a cam! Didn't Comp cams do a ' Thumpr' series which had the lope at idle but with modern lobe design?
If I had a 318/340/360 then I'd probably have a 518 in it now, on the basis of the overdrive improving cruising more than efi would. But as discussed earlier a 383 will need an adaptor, which then opens up further debate about whether to stick with Mopar and the A518/46RH or go GM TH700R4/4L60E for it's relative availability, affordability and ease of getting replacement parts.
Lots of useful specifics in David C's post - thank you!

[Green411]

Hi all Just a quick update - well I bought the Holley Sniper, plus a drop-in fuel module with a 255 lph in-tank pump. Started work after getting home from a New Years Day local car show - where my car attracted a lot of interest.
Have taken my time and am now most of the way through the install. I have tried to disguise the update as much as possible so it looks original. Am writing about the job for Bodacious, and will post on here again after the big day. Will it still run? Ulp................

[Thor]

That's brilliant Mr. Green411, I am so looking forward to hearing how it goes.

[Green411]

Thank you Mr Thor (Is 'Mr' a suitable title for a God of war? Discuss...)
My current problem is trying to find a 1/8 NPT temp gauge sender with the same resistence as the standard one - the ECT sensor has to go in the top of the waterpump, where the temp gauge sender used to be. The only other available wet port for the gauge sender is a1/8 npt one on the front face of the pump, just below the old 1/2 NPT port. A £10 item that's driving me nuts......