305 to 350 swap

[c1500deathtrap]

Actually the 305 exhaust will not work with a 350 tune. 02 sensor placement and number of cats are different for a 305 and 350 tune. You need someone with Tunercats OBD2 to correctly configure the cats and sensors. HP Tuners and EFILive cannot do it.

EDIT-Disregard just remembered we were talking a TBI truck not Vortec. i will leave the info above for anypne considering swapping a Vortec 305 to 350 and vice versa.

For that you need a knock sensor, injectors and prom chip from the same year 350 truck with the same trans. EGR is usually the same.

93 is obd 1 you shill.

 

[L31MaxExpress]

93 is obd 1 you shill.

I already corrected my statement. I thought I read 98 year model in the OPs post.

Nothing in my response makes me a shill either. Merely stated a fact.

 

[Gramps]

I do not have a copy of the Tahoe one at hand but the L30 can be woken up very well. I tuned a stock 100k mile L30 long block with a few bolt ons and a 350 exhaust years ago that I had in my Express van for about 2 years. Stock cam, 1.6 full roller rockers, shorty headers and a 350 dual cat exhaust. Not hard to know a fresh almost no mile engine, with thinner head gaskets and .020" milled heads, 24° @ .050 more intake duration, 22° more exhaust duration, .073" more intake lift, .059" more exhaust lift, a ported lower intake, cold air intake, underdrive pulleys, and electric fans would be 42 hp more.

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Again, machining the heads and new cam is not simple bolt on modifications.

 

[L31MaxExpress]

Again, machining the heads and new cam is not simple bolt on modifications.

Depends on your definition of bolt ons. To me it is a job that takes less than a weekend to do regardless of the vehicle.

 

[NightRunner]

I'll ride the "if you're not looking to go fast and you're decently happy with the 305, stick with it" train. It's a capable little motor on it's own. You won't hang with any 350's but it'll get you where you need to go and still be a V8 in the process.

Now if it was a 4.3 on the other hand...

 

[89GMCJOHN]

I'll ride the "if you're not looking to go fast and you're decently happy with the 305, stick with it" train. It's a capable little motor on it's own. You won't hang with any 350's but it'll get you where you need to go and still be a V8 in the process.

Now if it was a 4.3 on the other hand...

305's ...I have 2.02 heads on my 305 in my camaro and around 9:7 to 1 ....I have a 280 .480 lift cam in it and its more of a "poser" than a runner but it runs really well for what it is and will hang with the 350's lol .....and before anybody pipes up YES you can run 2.02's on a small bore 305 as long as you dont go over .480 lift ... also 305's have the reputation of not being able to kill them - they will last a very long time ..FWIW......

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[NightRunner]

I bounced around the idea of throwing a 305 into my S10 since you can find them for dirt cheap around here. Anything would be better than the tired old 4.3 that's currently in it and cmon, who doesn't love a V8 S10 anyways? Lol

 

[df2x4]

Now if it was a 4.3 on the other hand...

I resemble that remark...

I'd argue that the 4.3 is a plenty capable engine for a daily driver. After my recent 4L80E swap though I do find myself looking around for used LQ4s...

 

[89GMCJOHN]

I resemble that remark...

I'd argue that the 4.3 is a plenty capable engine for a daily driver. After my recent 4L80E swap though I do find myself looking around for used LQ4s...

Agreed the 4.3 is a great engine in an s-10 ..plenty capable as you said...

 

[df2x4]

Agreed the 4.3 is a great engine in an s-10 ..plenty capable as you said...

My 4.3 even lugs my long bed C1500 around with a 4L80E behind it just fine. Slowly, but fine. I'm definitely going to swap it out for an LQ4 at some point, but probably not until the V6 gives me some kind of major issue. Which it is showing no signs of. 150Kish miles and it still runs 40PSI of oil pressure at hot idle.