upnorth

I have a 1976 vette. had some carb problems and have never been happy with the one I have its a 600 holley on a torker intake . thinking of trying the holley 625 street demon . the block is decked 40 is 40 over on cylinders and 20 on crank shaft .done 25 years ago .was told I bought dart heads but they have the NH 1613 6 1037 on them so I think there world sportsman . there 64cc angle with 202 , 160 or 190 . last time i checked it was running 215 compression . i was told to put a performer rmp on it what do you think would give it the most without spending a bunch . have a 350 350 kit on it with crane roller rockers .

The13Bats

In general the "torker" intakes are not correctly named,
They are open plenum and hurt low end off the line torque, the are good for 2500-6500
But the performer is idle to 5500.
rpm is 1500-6500 so where do you desire that power,
When I swapped a torker for a performer on my 454 I could feel a off the line difference.
A 600 working well be it holley or edelbrock or any clone of them would work but of course you could go up to bigger cfm if desired.
Do you just cruise the streets or do you hit the track?

upnorth

no track . live I the country looking for more off the line . just like to jump on it once ina while .

The13Bats

swap in a base performer ( not rpm ) add something like a quick fuel carb and you likely will be happy

upnorth

I will look into that thanks . its been 25 years since I put the engine together . can someone tell me what the marks on the heads stand for . they were suppose to be dart 64cc with 202 190 or 160 with angle plugs . the marks ive found so far are on the top they are top middle NH right side 1-037 left side w 1613 6 side marks are covered with paint and brackets will had to get a mirror and look more for them .

The13Bats

I do not know by how much but the performer is a little taller than the torker that was on my bb, keep in mind for hood issues.

Haggisbash

Performer EPS is about 5/16" to 3/8" taller than Torker at least that is how much I had to lower the air cleaner to get the hood shut on my '70. The Performer made a noticeable difference at low rpm.

upnorth

if I go with the performer is my holley 600 enough?

keithinspace

A 600 carb is enough. Like Mr. The13Bats, I'm a fan of the QuickFuel variant of the Holley formula. They are just awesomely constructed carbs.

If you don't have a whole big pile of engine, the non-RPM version of the Edelbrock Air-Gap would be a very good selection. The dual plane intake will augment your bottom end and the non-RPM variant reaches even lower into the bottom end with the sacrafice of the over-5,500 RPM band that you're probably not even using. The Air-Gap aspect of the intake both lengthens the runners and decreases the heat soak from the coolant to the fuel charge.

The single plane Torker you are using will, by its very nature, rob from the bottom end and amplify your power band. It will, by design, flatten your engine power from idle to 2,500 RPM. Probably not the best match to a mild build on a street vehicle. Nothing wrong with the World heads if properly built, but you're only taking advantage of the extra breathing with a real step in your cam profile.

Some additional information about my car for color: My next engine upgrade will be the Performer RPM Air-Gap. It has all the attributes of the non-RPM version, but is freer flowing, upping the power band to between 1,500-6,500 RPM (versus Idle-5,500 RPM). I have a pretty aggressively built 350 that I regularly spin to 6,000 RPM and while I dearly value my bottom end (hence the dual plane manifold), I don't want to completly rob its free-spinning power-producing nature up top.

I've been dealing with decision for a while and I thought I'd share my thoughts. I hope this insight is helpful.

upnorth

how do I know which performer to get for my combo . its not the original engine . but it has the different heads and the block was decked 40 thou . my brother also told me he has a holley 650 double pumper that I can have that's just been rebuilt and has brass floats .