rv1890

iTrader: (3)

I recently spun a bearing in my 305, and acquired a 350 to replace it. I would like to know what kind of performance i should be expecting out of this motor, and if its a good idea to swap it.

Bloc id - 10054727 shows its a 86-up 350
head cast - 14102193 - shows its 305/350......1.94"/1.5" valves
The motor has the GM 1.5 aluminum roller rockers, and a mild cam although I dont know what kind.

Currently its on an engine stand - is there anything I should check and/or replace while its easy to do?

P.S. I keep reading on this forum that the heads are garbage- are they really all that bad??

Boosted_SS

i would go with the world sportsman II heads. 160 exhaust valves/2.02 intake valves. i would go with the 72CC chambers. i would also go with 1.6 full roller rockers and a GM hot cam. i would say with that setup you should be between 350 and 375 hp. if you don't want to swap out the cam you NEED to know the cam profile to get a chip made for your car to run. DO NOT attempt to run the 350 on the 305 chip!!!

rv1890

iTrader: (3)

Yeah - ill be replacing the chip with one for a 350. What if I dont know my cam profile? then what - how and who can make a chip for me??.

Boosted_SS

http://www.hotrodlane.cc/

go to that website and call them and they can make the chip for you. they need the cubic inches of the motor, cam specs (lift, duration, and lobe separation), injector size, transmission, rear gears, tire diameter, and type of car. i had my chip made by them and it's awesome. hands down the best I've had made. it was even better than the one i had custom made for me on a dyno. they charge 200 for the chip and tune and the one i had made on the dyno was 800 bucks.

five7kid

iTrader: (14)

The 193 heads are pretty poor. The 72cc chamber Sportsman II's are also a poor choice, unless you have plans for some sort of power adder. Even then, dished pistons are better than large chambers, every time.

The 305 PROM will run a 350 without problems. It may run a little better with the more aggressive 350 PROM, but then most any TPI runs better with PROM tuning. But, the MAF isn't as sensitive to displacement changes as the SD systems are.

Do-it-yourself PROM tuning makes a whole lot more sense than paying for somebody else's guess. The equipment and software won't cost you much more than the first wrong try by somebody else.

rv1890

iTrader: (3)

as i research a bit about chips most companies want specs on the cam, and all i was told is that it has a mild cam. is there a way to get it made without knowing the specs, or how can i find out what the specs of the cam are. id rather not remove it from the engine if thats whats involved. also how about a stock 87 chip? im looking for mild performance.

btw - with the setup i have whats the performance numbers i should be expecting?

rosco88ta

iTrader: (3)

Does your car have auto trans? You could always get a new stock cam a get a stock gm chip
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I guess it all depends on how much money u want to spend on it too. How many miles on the 350?

rv1890

iTrader: (3)

yeah auto trans. motor has 70k on it. id rather not mess with taking the cam out or anything.
Specs
heads - 1.94/1.5
1.5 roller rockers
mild cam
5.7- auto
2.73 gears- factory 16" wheels

Theres no way I can get a "general" chip that will make my car run going off these specs?? I really dont know what cam it has in it.

five7kid

iTrader: (14)

To get the engine running, your stock 305 chip will do the job. As long as the cam doesn't have a lot of overlap, you won't have any problems - "mild" cams don't have a lot of overlap.

Put the engine in, start it up. An '87 L98 350 chip might get a little more out of it, but that's about it - a little more.

It should run low 15's, maybe high-14's with the setup you describe.

rv1890

iTrader: (3)

Tnaks five7kid- thats what I needed to know.

One more thing...I have my old 305 which has a map sensor under the air intake, and the new 350 I got came with a MAF sensor rigged with a bracket near the ignition coil. I also have (2) fuel rails to choose from - my 305 which had the cold start injector, or my 350 rail with the cold start plugged on the rail, and plugged on the runners. Which should I use? I know either rail will accpet the 350 injectors, but if i wanted to get the 87 l98 chip then should I use the map sensor or the maf sensor, and should I keep the cold start plugged or use the 9th injector?? thanks.

p.s. dam i hope that made sense

five7kid

iTrader: (14)

I would use all of the 305 TPI parts except use the 350 injectors and knock sensor.

91 355 z28

well only the vet for a few years had the maf setup.. nd theres no way to make that work with a regular computer.. as far as the cold start injector goes its for just that cold starts.. on the late modle 3rd gens the injectors all pulse a few times b4 start up to get some extra fuel into the cyl to make it easyer to start.. thats wut ur 9th injector is for.. i would sugest using it.. but i have no experiance with the cold start style in the winter to say for sure..

rv1890

iTrader: (3)

Ok. all said and done.

Im keeping the existing MAF setup thats in my car now.
Make sure the engine has a 350 knock sensor.
The 350 injectors already came with the engine.
And changing to an 87 350 chip.

Anything im missing??

Oh what about the ESC module. Do I need to change that to one for a 350??

five7kid

iTrader: (14)

WRONG, WRONG, WRONG!!!!!!

'85-'89 f-body TPI was MAF. Went to speed density in 1990 model year.

rv1890

iTrader: (3)

So am I right when I say this???

rv1890

iTrader: (3)

ttt

five7kid

iTrader: (14)

That's the right stuff.

The ESC module goes with the knock sensor. Both need to be 350 parts.

Later TPI put the knock control within the ECM, from what I understand.

rv1890

iTrader: (3)

Thanks guys - Ill let you know how it goes. Should be a few more days!!

rv1890

iTrader: (3)

Alright - swap is complete. havent driven yet, because it still being tuneed and timed and everything. The motor sounds real strong and good.

One problem though - I ordered a prom adapter from tpi parts, and had them set the factory 350 settings. I had a problem with the fans staying on, and the engine throwing a code 41 (faulty or incorrect memcal). I reseated the adapter, and that took away the code, however the fans still stay on. The mechanic told me to return the adapter because its bad. I highly doubt that. Could it be anything else. The fans would operate fine when my 305 was in the car. The fans wil turn on when the car is started, and they stay on. Dual electric.

five7kid

iTrader: (14)

Just a guess, but they probably made an error in the programming.

rv1890

iTrader: (3)

WOW !!!!!. Thats all I got to say about chevy power!!.

The swap is complete. Fresh 350 - performance 700r4 - tuned.

I just drove it home, and I think I already need a new set of tires, and brakes . This thing has gobs of more torque.

Word to wise - If you blow a 305, swap it with a 350 - you will love it!.

thanks guys - especially five7kid for answering my questions.

five7kid

iTrader: (14)

Great, ain't it?

I was wowed when I souped up the LG4 from stock to ported heads, cam, exhaust, and higher stall converter. I was double-wowed when I put the heads, exhaust & converter (similar but slightly different cam) on a 350 shortblock.