GMC V6 fellers

[JAKES 68GMC]

I know there's a few of you guys on the board with 305 and 351 V6's in your pick-ups. And IIRC I said I'd do a report about the Holley 500 as soon as we got the truck going, but I can't remember.

Anyway, the Holley 500 works flawless on my V6. I usually don't use fancy words like that, but in this case I will. It will rev up a lot faster, accelerate a lot quicker, and have a lot more power. With the old Stromberg, you could tap the pedal, and the truck would go. Just kinda putt along. But with the Holley, it's a whole other story. If you tap the gas, now the whole truck will rocket right off (for a truck engine, anyway).
The other side of it, is that it's pretty much a bolt on ordeal. The Rochester 2bbl-Holley 2bbl adapter is idiot proof, since it only works one way you bolt it on. (wonder how I know that ) The only things you may have to change is the choke cable, and your fuel fittings/line to the carb. You also have to drill a hole in the throttle bar, so you can slide a cotter pin through to keep the bar attached to the carb. Other than that, it's straight forward. You do need a 4bbl Air cleaner (if you dont already have one), and maybe a 1/2in air cleaner spacer, to clear the float adjustment screw/bolt. Other than that, everything works great. You may have to adjust the idle a bit, but no other adjustments needed. I think the total cost of the upgrade is about 315 bucks, give or take a few bucks. Well worth every penny IMO.
Carb-$250
Air-cleaner-$30
carb adapter-$20
choke cable-$10
Air cleaner spacer-$5

[Bob B.]

Good to know because I just bought one for my 351E. For the record, you have to make an adapter to install a Holley on a 351E due to the odd bolt pattern the larger Stromberg's had. You didn't have to change the jetting or power valve at all?

[TP from Cntl PA]

Whatcha doing with the old Carb? I wouldn't mind having a parts source for mine.

[JAKES 68GMC]

Originally Posted by Bob B.

Good to know because I just bought one for my 351E. For the record, you have to make an adapter to install a Holley on a 351E due to the odd bolt pattern the larger Stromberg's had. You didn't have to change the jetting or power valve at all?

Nope. I did have to adjust the idle down a bit though. Like I said, works great. Perfect bolt on and worth every penny

TP, I still have the Stromjunk but I'm keeping it for my own parts stash. I'm keeping everything original that I take off the truck. Seems like a good idea to me. If your Stromjunk is truely junk, I'd throw a Holley 2bbl on and enjoy the power. Guys like you that actually work your trucks pretty hard would love it. Trust me.

[TP from Cntl PA]

Originally Posted by JAKES 68GMC

Nope. I did have to adjust the idle down a bit though. Like I said, works great. Perfect bolt on and worth every penny

TP, I still have the Stromjunk but I'm keeping it for my own parts stash. I'm keeping everything original that I take off the truck. Seems like a good idea to me. If your Stromjunk is truely junk, I'd throw a Holley 2bbl on and enjoy the power. Guys like you that actually work your trucks pretty hard would love it. Trust me.

I love my Stromberg..............Hasn't given me a wiff of trouble in all the years I had this truck. Haven't had any reason to change, and as long as it is working well, I won't..........I'd just like to have some parts on hand incase something would happen.

[67_C-30]

Originally Posted by Bob B.

Good to know because I just bought one for my 351E. For the record, you have to make an adapter to install a Holley on a 351E due to the odd bolt pattern the larger Stromberg's had. You didn't have to change the jetting or power valve at all?

I have a 351 Magnum that has the trapezoidal base. Is this the same intake that is on the 351E?

[Bob B.]

Yes, I think a 351E manifold is the same as a 'Magnum'. BTW- you guys know GMC was using the 'Magnum' name 2 years before Dodge ever thought of it?

[67_C-30]

Originally Posted by Bob B.

Yes, I think a 351E manifold is the same as a 'Magnum'. BTW- you guys know GMC was using the 'Magnum' name 2 years before Dodge ever thought of it?

Yes, and GMC was using a 351 before Ferd ever thought of it.

What do the manifolds look like on a 351E? Are they smooth like the 305E, or are they ribbed like the bigger cu in V6's?

[JAKES 68GMC]

I assume you mean exhaust manifolds. Pick-up V6 engines (305 and 351) are smooth and restrict down to 2 1/4 in on the outlets. Bigger trucks are ribbed and are 3in at the outlet.