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350 TBI GURUEZ NEEDED

 
BadBowtie0727
I love my Chevy Chevette!
Posts: 16
Joined: 01/13
Posted: 01/29/13 10:06 PM

I have new 350 tbi in 89 p/u....stock block and will upgrade heads in future. I'm installing cam, roller lifters/rockers, high rise intake w/ tbi adapter, fuel psi. reg in tbi, high flow fuel pump, ecu chip. Now a few questions....wanting above average cam w/ rough idle if possible. Cam choice? Lifter choice? Probably using alum roller rockers...will I need to change valve springs? All help is needed and appreciated  

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pepsi1
Big Block power for the win
Posts: 940
Joined: 03/11
Posted: 01/30/13 02:34 AM

BadBowtie Welcome to Super Checy:

Bob  

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pepsi1
Big Block power for the win
Posts: 940
Joined: 03/11
Posted: 01/30/13 02:36 AM

I listed cams you should think about but thread disappeared. I'll try it again.
Bob  

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pepsi1
Big Block power for the win
Posts: 940
Joined: 03/11
Posted: 01/30/13 02:38 AM

There were (3) questionsyou really need to answer.

1.Rear Gear Ratio

2.Automatic or manual trans?

3.How tall are your Rear tires?

Bob  

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pepsi1
Big Block power for the win
Posts: 940
Joined: 03/11
Posted: 01/30/13 02:38 AM

There were (3) questionsyou really need to answer.

1.Rear Gear Ratio

2.Automatic or manual trans?

3.How tall are your Rear tires?

Bob  

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pepsi1
Big Block power for the win
Posts: 940
Joined: 03/11
Posted: 01/30/13 02:53 AM

Comp Cams has one Hydraulic Roller:

P/N 08-306-8 Grind # 290HR12
Good cam for power and torque.

2.Lunati Voo-Doo
P/N 10120641
Fair Idle RPM Range 2,500-6,200 230/240/ dur.@.050 489/520 lift
Fair Idle and good torque

3.Lunati Cams
P/N 20120710
Good Idle Mild Mid Range Power
Use all stock accesories

4.Lunati Cams
P/N 20120678
1200-4500RPM
Stock replacement cam

5.Crane Cams
Grind #2032 P/N 104224
Used in '87='89Corvettes and Camaro's

6.Crane Cams
P/N HR-284-2S-121G  P/N 109831
200-6200RPM  220/230 Dur @.050 509/528 Lift
Fair Idle mild Bracket Racing use with 2500 Torque Conv.

7.Crane Cams
P/N HR-224-345-2S14.041G  P/N109871
2200-6400 RPM Range 224/232 Dur @ .050 518/539
Good Performance Cam Needs 2500 Torque Conv.

Bob  

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BadBowtie0727
I love my Chevy Chevette!
Posts: 16
Joined: 01/13
Posted: 01/30/13 04:56 PM

All great cams but a little pricey...motor parts store can get me a roller cam for 75$ with my core...I don't know if they re grind or what though...can I tell them scecs of comp or luniati cam and expect same performance? Guess ill get a stall converter also...transmission was rebuilt w/ "homemade" shift kit (drilled valve body bigger and used bigger springs or something) I don't really like it bc it shifts too soon...thinking about tras pac shift kit if it will improve...ecu chip should also change shift points I think. Stock rear end gears now but thinking about lowering ratio...want to run 90 mph on hwy but low end torque also....4 11 do the trick? Running 275 50 15 tires which threw speedo off. Auto trans  

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BadBowtie0727
I love my Chevy Chevette!
Posts: 16
Joined: 01/13
Posted: 01/30/13 08:04 PM

sry 295 50 15 rear tires...timing chain and gears need changed to roller also?  

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pepsi68
I love my Chevy Chevette!
Posts: 5
Joined: 02/13
Posted: 02/02/13 07:15 AM

The Price of going Fast. The faster you go the more it will cost! If they are regrinds, and the cams aren't hardened they will be junk in a Heart Beat. A Roller Cam for $75.00 ground to Crane, Lunati, or Comp Cams specs, what can anyone say?

The stall will be determined by your cam. The higher the lower RPM the higher your stall needs to be.

I have nothing against home brewed transmissions, but you need to check it out first.

Anytime you change rear gear ratios, the speedo gears need to be changed.

Is 90 MPH your top speed?

Note: The taller your rear tires the less gear you have.....
     The shorter your rear tires the more rear gear you have.....

4:11's that will be determined by your again how tall your rear tires are.

I'm not chasing down tire size to figure out your rear gear ratio. Just tell us how tall your rear tire is... You need to help us too.

Bob AKA Pepsi1  

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pepsi68
I love my Chevy Chevette!
Posts: 5
Joined: 02/13
Posted: 02/02/13 07:19 AM

It would be very wise to replace the timing chain and gears. With a Double Roller Cloyes set-up. There is also a high torque load on the cams gears, and chain... Grin  Cool

Bob  

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BadBowtie0727
I love my Chevy Chevette!
Posts: 16
Joined: 01/13
Posted: 02/03/13 02:02 PM

90 mph is not top spd now but didn't know if 4 11 gearing is maxed out about 90 - 100 mph...rear tires are 25 in. Tall...295 50 15  

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68scott385
I have an SS396 tatoo
Posts: 325
Joined: 07/09
Posted: 02/03/13 11:09 PM

speed is determined by rpm, gearing plays a secondary, but important role, tire diameter can have big effects too  
68scott385 68scott385 68scott385

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68scott385
I have an SS396 tatoo
Posts: 325
Joined: 07/09
Posted: 02/03/13 11:41 PM

Here is a formula that will help determinig top speed with various tire diameters and or gear ratios.

RPM = (168 x final gear ratio x mph) / tire radius

final gear ratio = transmission output ratio x rear gear ratio...

if you have a 350 or 400 trans without overdrive, third gear ratio is 1:1, and rear gear ratio is 4.11:1 >>> 1 x 4.11 = 4.11

if you have an overdrive, say 700r4, that has a .7:1 fourth gear ratio, and rear gear ratio is 4.11:1 >>> .7 x 4.11 = 2.877

5191 = (168 x 4.11 x 100) / 13.3  

I use 13" as tire radius because mathematically a 295/50/15 is 26.61" tall.

tire diameter = [2 x (section width / 25.4) x (aspect ratio / 100)] + rim diameter

[2 x (295 / 25.4) x (50 / 100)] + 15 =
(2 x 11.61 x .5) + 15 =
 11.61 + 15 =
 26.61

[2 x (275 / 25.4) x (60 / 100) + 15 =
(2 x 10.83 x .6) + 15 =
 12.996 + 15 =
 27.996

4932 = (168 x 4.11 x 100) / 14

5191 - 4932 = 259rpm less @ 100mph with a slightly narrower but slightly taller tire ... that doesn't sound like much but if you care any about gas mileage or running at freeway speed for any amount of time, it will be a noticable difference

Not trying to influence your combination, just help you figure what combination of parts suits your needs best.  
68scott385 68scott385 68scott385

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BadBowtie0727
I love my Chevy Chevette!
Posts: 16
Joined: 01/13
Posted: 03/07/13 09:31 PM

Installed vortec heads, 480 roller cam, intake, etc... Had to tap block nipples for lifter hold down plate...changed distributer gear to match cam. Distributer goes in smooth but won't drop into oil pump shaft!!! Tried bumping motor over while pressing down on distributer...tried turning oil pump shaft to line up...all help is appreciated.  

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BadBowtie0727
I love my Chevy Chevette!
Posts: 16
Joined: 01/13
Posted: 03/08/13 09:53 PM

I finally got it...I ended up pulling dist gear off to see if dist would seat in oil pump shaft...it did so I figured cam was too far forward or back...loosened rocker nuts and it dropped first stab...boy was I happy after 3 days of failure...finally heard the built motor run with ear to ear smile  

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