LOL....customer truck.
 

So a customer bring g me his 77 K10. Decent truck and he wants to clean it up and do some upgrades. It has 400 sb "509" block.
Previous owner decided to put 305 heads on it. Great so now it's 10.0:1 compression witha cam and falls on it's face around 3700rpm....
Sounds good at idle anyway.

LMAO

Dan

Re: LOL....customer truck.
 

why would people do this? lol

Re: LOL....customer truck.
 

I dunno man. The current owner is a great guy so I'm hooking him up with a 355 build that should take him just over 400hp and around 480tq.
It will be based on on a Vortec block for the 1 piece rear main and the hydraulic roller cam. Iron Vortec heads. 9.8:1.
I bet he will have more fun with the new setup and pump gas friendly.

Re: LOL....customer truck.
 

I have seen it a few times in my life, but usually they corrected the high compression ratio with a rebuild. The best example that I saw from beginning to end was a friend at the time.

He had a idea that if he put 305 heads which were mildly ported/cleaned up with a cartridge rolls on a 350. The idea was the high velocity would help torque, and thusly help improve mpg. At the rpm he drove 2200-2500rpm. It would also fall flat at 4300-4500 rpm, but wow it had some torque. Also it would idle at 600 rpm like a dream, and started almost like a fuel injected car. Quite a few of us got into the experience, and we were lending him various items to try out. Things like ram air intakes, velocity stack style, 4 inch tall filters, and Holley vs Q-jet.

I don't remember the details, but it did work out quite well for him. It was something like 9-1 comp, 1.5 inch long tube headers, advanced cam timing, and highly detailed build. The cam was similar to a comp 265 where it usually has a factory 4* advance, but he put it to 6*. The rear end was a 2.47 gear swapped into his 10 bolt. I don't remember what the final version ended up being as it went through a few variations, and parts changes looking to fully dial it in. In the end with a TH350 auto he could get 25 mpg highway doing 60, and 22 doing 70.

He lived in San Gabriel, and worked in Mira Loma as a diesel tech. His first real job, and starting out. Since it was a longer drive, and he needed a new engine anyways. The whole build started coming together. Back then overdrive transmissions we're very expensive so he tried this way.

Re: LOL....customer truck.
 

This one is a monster to 2800, but after that it goes away quickly. I don't think they have been ported and even so they would still be garbage. These are the 58cc "saddle" casting. 130 cc intake runners.
I've seen it before too, just been awhile.

Re: LOL....customer truck.
 

True they still flow like garbage, but if low speed torque plus a strong sotp feeling. Is what you want they will work. Depending on what size engine they go on they can really limit rpm.

In my friends case they worked because he went all in on the concept. Where as if you just put them on a traditional 4.11 geared 350 SBC powered truck. The gains wouldn't be there as your at the beginning of the choke point at the mph most drive now. Plus induce other issues that would come up on a basic head swap with out considering potential issues. Although it should start up great, and sound pretty mean.

Re: LOL....customer truck.
 

So, same truck. We are doing a complete front end rebuild in it. Recent had the diff covers off for inspection. Cleaned them up and coated them in KBS Rust Seal. The stuff is really durable and looks pretty dang good.
Won't just flake off like bomb can crap.

Re: LOL....customer truck.
 

How do you like kbs vs por15 or rust bullet

Re: LOL....customer truck.
 

Absolutely LOVE the KBS system, and I've been using POR15 for years. I'm so impressed with it and the customer service that I'm seriously thinking about becoming a reseller. I'm just outside Boise Idaho and the closest reseller is over 200 miles away.
Anyway, the stuff work often better than advertised. The pics of the diff covers were done with a 79¢ bristle brush. It flows out and self levels incredibly well. It can be sanded and recoated, top coated, cleared, etc.
I love the stuff.

Dan

Re: LOL....customer truck.
 

KBS is excellent stuff. Did my frame and rear axle in it.

Re: LOL....customer truck.
 

Why not recommend to upgrade the head to vortecs?

Re: LOL....customer truck.
 

Compression numbers and leakdown were out of range. Otherwise, that's exactly what I would have e done. With just minor machine work the Vortecs work great on earlier stuff.

Dan

Re: LOL....customer truck.
 

480tq ? 355 cubes? At what RPM? Naturally Aspirated?

Re: LOL....customer truck.
 

All the numbers are rough estimates. Any builder know that its just an educated guess til you get on a dyno, even with a repeatable build.
Now, 10.3:1/ around 5600, and yes naturally aspirated.

Re: LOL....customer truck.
 

those covers look great!!!!!

Re: LOL....customer truck.
 

Thanks, Customer doesnt know it yet but I'm doing the rest of the front suspension with that as well. He gonna be stoked!

Dan