What?! I'm shocked. I figured you be all for EFI.
Seems like the "best" current bolt-on EFI's are still iffy. Friend works in high end shop that uses EFI on most builds. Last one was simple no-brainer build. Way overkill engine shop and Holley Sniper was not right on dyno. Holley was even present. Holley sends out another new unit and it worked. But still nothing impressive at all on dyno.
I'm sure when the magazine article is published, the EFI issue won't be mentioned.
That's exactly what I used to do. But in the off-season I stuffed a 318 into it and still had a lotta lotta winter fun.No I'll only have the car on the road from May through to the end of September. They don't clean the sand off the roads from winter until mid April and October is to hit and miss to keep the car insured so no the car will only be fair weather driven.
Hey guys I think that I've got all the pieces together now, flow numbers on the heads and Cam's been ordered from Racer Brown. Here's a quick rundown of it all;
- 340 .030 over
- 10.5-1 compression
- W2 heads w/ valve job & bowl blend - 263CFM
- MP single plane intake manifold
- Headers
- 4 speed
- 3.91 gears
- Racer Brown cam, 242 @ .050, 542 lift, 276 duration, 106 separation
I'm decided to go without a choke so just need to sort out what size carb, a quick comparison of the Holley Street HP carbs (or QF Street Q line) reads the following but I'll after some help from you gents sorting out the numbers. I don't have a great understanding of the numbers so advice is greatly appreciated.
650 carb, 69 Primary jet , 75 Secondary jet, 1.250 Venturi, 1.688 Throttle
750 carb, 77 Primary jet, 84 Secondary jet, 1.375 Venturi, 1.688 Throttle
Thanks for the help guys!
So you already have the Carter style 750?I know this is an older post, but I'm keen to find out which carb the PO used in the end.
I have a mild 340 with a Comp XE274H hydraulic stick, my car's a 67 Barracuda, 4 speed with 8-3/4" sure-grip 3:23. I plan on running an AFB competition series 750, what do you guys think about this carburetor for this application?
So you already have the Carter style 750?
If you do, run it it’ll be good.
Otherwise, a Holley would be just fine as well. A bit better in tunabilty. Something like a Brawler.
A 750 will shine better on the top end. I wouldn’t go past a 750.
What Holley model/list number?
If you have an air GAL intake definitely a chokeBump, I'd like some input from the guys on the board about going with a choke or not, appreciate any help.
Thanks, Mike N.
An excellent base Holley to start with. You can apply all sorts of upgrades to it.rumblefish360, the list number on my Holley 750 vac is:
LIST - 3310-4
Only when it gets a good bit chilly.If you have an air GAL intake definitely a choke
Old post I know. I guess pumping the carb multiple times to get it to run without a choke is not washing oil off either. My only issue with electric chokes is how fast they come back on when the car is still warm. Divorced chokes definitely do it better there, but are slow to come off when the car is really cold. Later 70's models had the divorced choke with an electric element to speed up that come off.Unless this is a street only car the choke is useless. The choke is the single biggest piston ring killer there is. These engines only need a very rich mixture for the first 10-20 seconds after fire up. Any longer than that and you are using excess fuel that does nothing but wash the oil off the cylinder walls and increase ring and bore wear.
I know this is an older post, but I'm keen to find out which carb the PO used in the end.
I have a mild 340 with a Comp XE274H hydraulic stick, my car's a 67 Barracuda, 4 speed with 8-3/4" sure-grip 3:23. I plan on running an AFB competition series 750, what do you guys think about this carburetor for this application?