[77 cruiser]

Will this be much better or any over a cheap Mr. Gasket bolt on & go deal?

 

[Schurkey]

I'm not sure I understand the question. In the first picture, there's dual bolt patterns, but a squarebore carb won't be able to open the primary throttles.

In the second picture, there's only one bolt pattern.

What are you trying to accomplish?




IF (big IF) you have hood clearance and you can get the throttle and kickdown cables to connect, I'd prefer an adapter spacer for most applications.

A spacer adds plenum volume just like other carb spacers.

You can open the plenum divider in the spacer and you haven't had to carve metal out of a manifold that costs 10X or 20X as much as the spacer.

The spacer can be nicely blended to the rest of the manifold--some folks complain about flow losses, but I'd want to see proof on a flowbench.

Your results may vary.

 

[Tom Mobley]

yes. the rear openings on the square bore manifolds are way too small for a Q-jet. Sure you can run the adapter but it kills flow through the secondaries.

I have seen visible reversion from this setup on the dyno more than once.

I have an 800 Q on a Performer RPM Q-jet manifold on my car. Works for me.

 

[Tom Mobley]

Schurkey types faster than I do. Of course, most everybody does.

 

[77 cruiser]

The 1st pic is with the adapter on the intake & the 2nd is just showing how I opened & blended the squarebore RPM. I got the man. & spacer fairly cheap so I thought I'd try & work with it a little.
My ? was if it would work better than these Mr. Gasket deals.

 

[77 cruiser]

Schurkey types faster than I do. Of course, most everybody does.

I don't know I've got to be slower than you Tom, took 45 sec. just to do this.

 

[Guest]

77's spacer is the one to use either way!!

Spread-bore to 4-hole OR turn it over and go 4-hole to spread-bore..

Or at least the one I have out in the garage can be mounted either way...

pdq67

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[SoCalRat]

Waa thinking of doing this myself as I got an RPM reasonably cheap.
So how bad is the flow interference for a street only application? I have the Edelbrock 800 I'm running and was going to use theMr Gasket adapter.