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87 square body short wide engine replacement/swap

September 21, 2025, 08:53:14 pm by steve bloom | Views: 2688 | Comments: 4

Hi all, I am new to the site, I have a stock 87 short wide square body GMC, the engine is tired and I’m looking at doing either a factory rebuild with perhaps performance upgrade or an LS swap? I would like to hear, opinions and thoughts, both pro and con. My understanding is they are not too many performance upgrades for the factory 350 TBI with the 700 R4 that is in the truck at present. I have been considering an LS swap that I am not sold on it just yet. I’m sure some of you have had experience in this and I’m trying to learn more about the process of doing a LS swap, or trying to rebuild the factory TBI and get better horsepower and performance. Thanks for any comments or suggestions in advance.

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Using 87 C20 frame for a 87 V20

September 08, 2025, 09:28:22 pm by dc7432 | Views: 9516 | Comments: 4

Our 87 V20 (4wd) frame needs to be replaced and we found a 87 C20 (2wd) frame. Looking for advice on what modifications the C20 will need to convert to 4wd. Our plan is to use everything on the V20 just need a frame, thanks in advance.

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Vortec spark plugs

August 31, 2025, 01:42:07 pm by Chevygold | Views: 11882 | Comments: 4

My '76 C10 came to me with a Vortec 383cu in crate engine which was a good incentive to purchase I thought, whilst idly browsing Summit racing site for Vortec information came across spark plugs and realised they were taper seat long reach and although I need to check tomorrow I'm pretty sure the plugs in the engine currently are short reach!
Anyway like I said I'll pull one in the morning if it ever stops raining and see whats in there.
Could explain why my truck is so thirsty!

Graham

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Holley Street Avenger jetting

August 24, 2025, 02:57:34 pm by Chevygold | Views: 11311 | Comments: 2

Hi all, haven't done much to the truck for a while so thought I'd have another go at setting up my carb, it's a Street Avenger of I think 670cfm the numbers on the upper body are 80670-1 and 1682.
The engine is a 383 crate engine which it came to me with but beyond that I don't have any build details, I think the heads are Vortec as the centre bolts of the inlet manifold are at an angle to the joint face with the heads, no idea what the cam is although there was a Crane Cams sticker on the slam panel until I painted it but just the California info.
I have an AFR gauge and have the idle set at around 13 at a 750 rpm idle with the engine warmed up until the electric fan cuts in.
Distributor is an MSD high energy coil in cap electronic unit with vacuum advance.
I have 75 jets in the primary which seem to give good AFR readings across the revs, you can see the power valve opening as the revs climb and AFR is 13 ish all the way.
This is all running light on my driveway as it's blocked in by our Moho just now so don't know what will happen when the secondaries chime in.
What size mains would you suggest as a starting point for the secondaries? I have a pair of 85s to go in or would another size be better?
What colour springs would you suggest to go in the secondary vacuum pot?
Transmission is auto TH400 which went in after the original TH350 went bad and would only drive in reverse!
Sorry it's a bit long winded but wanted to give all the information I could to help.

Many Thanks
Graham

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Relocating Parking Brake Cables Because of Exhaust?

August 14, 2025, 01:38:51 pm by devildogmech | Views: 11258 | Comments: 2

Hey all,

So, I have a 1979 C-10, Bit Ten. Trying to finish up my LS Swap and I'm at the point where I can get the exhaust finished up.

The truck, of course, was originally a SBC 350, and the exhaust was in just a different place. My Exhaust runs just over or just under the parking brake cables and rods. I don't think 1/8" clearance is enough..... Have any of you relocated your Parking Brake gear to clear exhaust?

Thanks in advance,
Will in Chicago.

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