S10 Hop-Up - Page 2

jwvess00 · 03-22-2008, 01:37 AM

Hi there!

Canyonero, boring the intake to match the TBI is done for a couple of reasons;
1) On a stock 2.8 TBI intake, the 4.3's butterflies will hit the intake when you open the throttle. Your choices are to bore the intake or put a spacer under the TBI that has a bore size that matches.

2) Boring the intake lets the intake flow more air to match the additional air from the TBI. The 2.8 needs more air, and a larger TBI combined with the intake machined to match helps. Without machining the intake, the intake becomes a restriction.

jwvess00 · 03-22-2008, 01:40 AM

Hi there!

I bought the Holley 502-3 2.8V6 TBI used several years ago, and ran it without any problems until I took two years to do paint/bodywork (I'm slow. and lots of things jumped ahead in line over those two years). After sitting for two years, one of the injectors stopped spraying. As far as I can tell, it just needs a good cleaning (i.e. LIndertech ) but I haven't gotten around to it. I have the TBI and the injector connectors (Holley used a different connector than GM) but not the adapter plate that allows it to be bolted to an unbored intake. If memory serves, I have tried it on an unbored intake and it does not have the same issues with the butterflies hitting the intake like the 4.3 TBI does. It has the "old" style 3-pin inline TPS connector. I am not using it, and do not plan to use it in the future. If someone is interested in it, ping me.

Canyonero · 03-22-2008, 01:50 AM

Quote:

Originally Posted by jwvess00

2) Boring the intake lets the intake flow more air to match the additional air from the TBI. The 2.8 needs more air, and a larger TBI combined with the intake machined to match helps. Without machining the intake, the intake becomes a restriction.

Yeah, that's what I was getting at. You don't HAVE to bore your intake to use a larger throttle body, but if your intake is still restricting you will only get partial benefit.

daytonxx · 12-02-2008, 04:54 AM

i have a 1987 2.8 v6 can i get more horse power out of this

jwvess00 · 12-02-2008, 08:04 PM

Hi there!

The easiest upgrade is the 3.4V6 crate engine from GM, or a '93-'95 3.4V6 Camaro long block. It is a bolt-in swap.

Otherwise, all of the standard hotrod methods work -- headers, cam, head work, different rocker arms with a higher ratio, bigger throttle body, machine work to the intake, etc.

daytonxx · 12-04-2008, 04:10 AM

what do i have to do to make it fit? and how much power cani gain ? and if i fix up my 2.8 how much power could i get u think?

betterthanyou · 12-04-2008, 02:57 PM

You don't have to do anything to make it fit. Externally it is an identical motor. Remove your old motor. Swap over your old accessories, intake, exhaust and the rest of the bits and drop in the 3.4L. Without doing anything special you get about 30hp and 50lbs more torque give or take. There are some details to doing it right so read the swap guide. You will find it on this site and on my site.

daytonxx · 12-05-2008, 02:38 AM

cant find your site can you tell me where to find it and how much would a 3.4 motor cost?

daytonxx · 12-05-2008, 11:29 AM

i have a 2.8 1987 s10 how much power can i get out of a 3.4 v6 its stock with 160hp if i buy a crate motor

betterthanyou · 12-05-2008, 03:17 PM

http://members.shaw.ca/betterthanyou/

The Crate is rated at 160HP with the old 2SE 2bbl carburettor and stock cast iron exhaust manifolds.

A few years back a guy named moneyclip on s-series.org measured 187RWHP with a 3.4 Camaro motor and Edelbrock headers and throttle body injection. If you were to use the Crate engine you should do a bit better since the crate engine cam is pretty nice and should get the power up a bit more.