New carb time...

[Boss 351]

I currently have an old Holley 650cfm double pumper with mechanical secondaries. I recently did a rebuild but noticed my base plate and throttle body is warped pretty badly. I will try to even it out by sanding on a glass plate but I do need a new carb.

My current setup is as follows:
- flat tappet .500/.500 lift , 224/224 durr Compcam
- Performance products Crosswind intake (dual plain)
- E7 heads (removed thermacular bumps, mild port job)
- KB flat top pistons
- 9.6:1 compression ratio

However this winter, the engine will see the following upgrades:
- Roller cam X303 or something simular (.542/.542, 224/224 durr)
- Aluminum heads, not sure what yet... ARF185's or whatever
- Performance products Hurricane intake (single plain)

So I was thinking a small 570cfm street avanger but I'm not sure if this carb will be good for an engine that will see 5500~6000rpm redline, maybe a 670cfm would be better for the new setup?

But I think I'm leaning towards a speed demon carb, I like the smoothness of it. So with that I was going to go with a 575cfm of this: http://www.barrygrant.com/demon/default.aspx?page=10

I need to buy one next week because my current carb is hardly working and whistles like a SOB!

 

[crazypete]

Well, I just put a 600 cfm double pumper in the classifieds.

http://classifieds.stangnet.com/showproduct.php?product=21578

The smaller 570 and 600 cfm carbs are preferable for throttle response. For a stick car, I might try a dp race carb but the vacuum secondary only for an automatic. I run the 570 avenger myself and I love it. You tap the key and it starts right up with a fury. Idles with a passion for life. Never ever bogs. The avengers and all holleys are just good carbs. I had a 670 avenger and it lacked quite a bit in the idle, starting, smoothness, throttle response department. For such a low redline, go smaller.

 

[Modular2v]

everone i know who has had a street avenger has had trouble with them gumming up

 

[crazypete]

Everyone minus one person then

You need to clean ANY carb. The avengers are so well built that most folks forget this and dont clean them regularly.

I usually spray carb cleaner down the snorkels into the fuel bowls then run the car. This cleans it from inside out. Toss some fuel system cleaner in occasionally.

I took my 670 off and it was squeeky clean after almost 2 years. I guess they have good gas in mass.

 

[maverick0716]

That 570 will be too small for your future mods. If you're looking for a vaccuum secondary carb then step up to a 670 street avenger (it won't be too big for AFR heads) Remember Vac. secondary carbs act smaller than double pumpers. I would even consider a Speed Demon, or Road Demon.

 

[Boss 351]

Well I just bought a new carb, it's a 750cfm Edelbrock. Well it wasn't new but only a couple months old and I got it for dirt cheap. It isn't tuned yet but I can feel the difference. It may be a little much carb for my E7's but it will be okay with the new heads

I sometimes test my "mods" by going up a hill at WOT and check what speed I'm going when I'm in front of a marker.

 

[Dean85GT]

that carb should be fine with a 351 and AFR heads.