[scooter1966]

Has anyone tested the flow difference between the factory individual port 4 barrel intake vs the Clifford open port intake manifold?

[camerjeff]

I haven't flow tested them, but I know my car slowed down 2 tenths and 4MPH in the 1/4 mile when I bolted on the Clifford Intake over the stock 4bbl Intake.

[scooter1966]

Goes to show the factory intake was build right.

but i wonder if the Clifford would do and better in a boosted application.

[camerjeff]

Possibly, but after doing some research on it, I think the biggest restriction was the carb, adaptor plate. To run the stock Q-jet on it was restricted on both the primary and about 1/2 the secondary flow was cut off.
Also the larger runner volume probably hurts the intake charge velocity. I ended up using the headers, but selling the intake. It looked to me to be designed as a replacement for the stock 1bbl intake, not the 4bbl intake.
With a blower it may be a good intake, but you would still need to feed it more fuel than the 500-600 cfm Holley it seems to be built for.

[GTOWAGON]

This Clifford intake works great

[camerjeff]

I am sure it does, I have never ran a Clifford 6 port intake! I was just very disappointed by the 4bbl version. I expected it to at least run as good as the stock intake, or at least make it up with the weight reduction like a Edelbrock Pontiac V-8 manifold. they are a wash with slightly less performance than stock but weighing about 45lbs less than the cast iron stock manifold, the car usually runs about the same times in the 1/4.

I always wanted to try a Webber set up, but the only intake I ever found was slightly fire damaged, and the $1000 price of the needed carbs and the expensive tuning parts always made me back away from the set up. I am a notorious cheap bastard!

[GTOWAGON]

Clifford still makes the intake at about 300.00 your right the carbs are the big hit but now there a couple places making fuel injection setups that bolt on in place of the weber carbs

[camerjeff]

Originally Posted by GTOWAGON

Clifford still makes the intake at about 300.00 your right the carbs are the big hit but now there a couple places making fuel injection setups that bolt on in place of the weber carbs

I stopped ordering anything from Clifford back in the late 1980's. It was not the products when or if they arrived they were mostly Chevy 6 cylinder parts they would send me, sometimes with the P/N ground off. I sent them a Check for a set of Pontiac Long Tube Headers in October, I had not received them by the new year so I called and they said that they "were out of stock and they would be making some as soon as they had an order for 10 sets" I asked how many years that may take as they had cashed my check as soon as they had it.
Well it took 6 more months to get them, and when they arrived they looked nothing like the previous set I had, the tubes were smaller and bent differently, I later found out they had lost the Pontiac Jigs, and had used the Chevy Jigs and welded those tubes to Pontiac Flanges. They did not fit the 67 Tempest I was attempting to put them in, and I was skeptical about performance compared to the older larger set I had on my 67 Lemans road race car.
Sent them back for a pair of "shorties" that fit even worse. They would not take them back and I ended up selling them for 1/2 of what I paid for them to a guy putting a OHC-6 into a 38 Pontiac Coupe.
I did try to buy a webber intake from them, but had learned to ask if they had a Pontiac version in stock, they said no but I could send in a check and they would ship one as soon as they had 10 orders. I never sent the check, they then said I could use a Chevy webber intake without the divided ports and only have to redrill the 2 outside holes. I again did not send a check.
After that I only purchased header gaskets.

From my experience in the 80's the quality had gone down hill from the early 70's. I do like the set of headers on my Firebird, and the set that was on my 67 Tempest were even better, but they were both made in the early to mid 70's. I have no Idea what the customer service is like now that Jack's Son runs the place after his passing.