355 SBC DYNO TESTS 1.5 VS 1.6 Rocker Arms and Holley VS Quadrajet!

Quadrajets are great carburetors, unparalleled driveability....the one thing the dyno won't show. Anyone wants to know all there is to know on them, pick up Cliff Ruggles Quadrajet book, the literal Bible.

I’m a Quadrajet guy so I was happy to see it hold its own! I love this kind of subject matter. You have found your niche, Mr. Gold!

Quadrajets were/are one of best in my view, and so easy to work with.

Thank you all for working together.

When I watched Super Stock D class going 10.20s in the 80s with a Q-jet I learned they were fast.

I run 1.7/1 full roller rockers in my 350 Chevy. The cam timing stays the same but the lift goes from .486 - .512. It will pull from 1,000 in high gear, and has a Comp Cams cam in it. I did the Riggles modifications to my Quadrajet, new plug wires and now it runs like a bat out of hell. This is in a 1969 Chevy G10 van. It amazes people as to how fast without revving the motor I can leave a stop light without burning rubber or such. If you run a flat tappet cam always run DIAMOND COATED LIFTERS (DLC). The plasma coating is almost as hard as a diamond and since out of carbon is slippery. They do not wear the lifters or cam. No more flat cams and destroyed tappets as I went through 4 times until DLC lifters. You can get them through Comp Cams and Summit Racing.

A friend had issues with his Q-jet on his Pontiac T/A.. I offered to let him borrow my Thermoquad which i newly refreshed with a carb kit, full pump travel, new jets and proper air valve adjust. Bolted right on(same bolt patterns). He was floored by how well it performed!!

Yay! My rocker arm idea worked! Appreciate the video. Keep em coming

Thankyou for these video's im from the uk 🇬🇧 we dont get these kind of engine's here, Im learning lot's thanks to youtube. I will own an old American car one day!

joe mondello used to work miracles with quadrajets i put a bushing into the throttle shaft to stop the howl and do a few small mods and they wake right up

Quadrajet is my favorite, the thermoquad has worked well for me as well.

Thanks for a great educational video guys, I'm pretty sure Austin knows as much as I do, he's been hanging around me for 30 years, as for the rocker deal, if the ramp speed was too slow the rocker would increase it basically getting it open faster, and helping blow down and scavenging, I doubt it was the actual lift.....a more modern cam like an XE series wouldn't have liked the 1.6 as much...... the stronger the initial exhaust pulse the more velocity in the exh pipe early on, that's why it helps in the early phases of overlap, I would bet one of Dave's trick 650 Holley's would have been a bit better possibly, I know they accelerate like crazy from my experience, again great video, Austin's race carb would have been better,but not streetable,nice job on the build Alan, that's a decent little powerplant!

I`ve had pretty good luck with Promaxx heads, a lot of bang for the buck.

Hey AG, Tim here, ANOTHER great Sun morn vid!!......that little SB makes GREAT hp/tq.....the cam and heads like each other!!....as the tq curve is nice......which shows VE......i didnt expect to see 420 lb ft.....and the carb exercise was SO neat to watch....(yes i'm a holley guy) but showed a Q-jet can hang.....TY sir for another enjoyable Sun morn coffee vid!!!....i ENJOYED!!

Love this channel. Keep up the great work

the hp gain would not show on a time slip nor the TQ for the money spent I did the same on track test made no improvments in time or mph in a dragster ,SBC. thanks for the information always.

Those are some impressive torque numbers for a 355 💪🏻 Those Promaxx heads ain’t no joke! They are probably the best of the budget heads, along with the AFR Enforcers. When you can get brand new aluminum heads for around $1,000 it’s a no brainer. To correctly recondition factory heads would be way up there.

This is excellent

I was one of those asking about qjet comparison. I find with modern pump gas most qjets need a little more jet than stock. With most mild to moderate street builds the qjet works better for frequent use. I’ve used several qjets rebuilt by Lars grimsrud and they work flawlessly. I don’t think anyone would debate for a more aggressive build then the Holly is a more popular choice and for good reason. The bowl in the qjet isn’t big enough to provide the fuel volume for a more aggressive build.

It appears that the engine was happy with everything Those Quadrajets work pretty awesome , 1 issue with the Quadrajet is they have a small fuel bowl They are pretty much equal to anything out there , they work very good on the street Thank You for the Video