I know that the tpi heads are better than the TBI 305 heads. I was wondering if there was a difference with the 305 TPI cam shaft compared to the 305 TBI cam shaft?? Is it worth change the cam when I switch the heads??

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Godti
'89 Trans Am (Red)
305 TBI 5spd

 

The 305 TPI automatic has the same cam as a 305 TBI, stick or automatic. You would want a 350 TPI cam, preferably 88-89, or 90-92. Even better would be an LT1 or LT4 stock cam. (not the LT4 HOT cam). Or check out the cam article on here for more suggestions. I'm not a TBI expert, but for a stock 305 TBI, you'd want a cam in the 195-205 intake duration range.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Ok, I read the cam article. If I read the charts right, I would have the Cam model #10066049 (I have a 305 TBI 1989). The article states "Most street cars work extremely well with a cam of 112 degrees seperation." So, from the chart, should I try and find the LT4 motor cam, model #24502586?? (It has 112 degrees seperation). Could I use the '87 305 auto cam model #10088155?? (It has 109 degrees seperation)

The reason I ask, is there is a shop in Toronto that deals strictly with f-bodys new and second hand parts. So I can try and get the LT4 cam from them, but I doubt it. Thats why Im wondering what cam I could use out of a stock fbody motor?? It will cost me a 3rd of a new cam. I dont want to sink real money till I start my new motor.

Sorry I missed one, should I try and find the cam model #10111773 (90-92 350,305). Basically I wanna know if these applications will work okay?? I dont want to strip my engine down, put this cam in and find that it wont run! Any advice or info is greatly appreciated.

Thanks

[This message has been edited by Godti (edited January 11, 2001).]

 

No no, that LT4 cam in that article is mislabeled. Thats the LT4 HOT cam, and you DONT want that. Also, the 87 305 AT cam is the same one you have now. The 90-92 cam would be fine, or better would be any LT1 stock cam, or the LT4 stock cam, if you can find them.

 

Ahhh....I can probably get a LT1 cam from that place in toronto. How will my car act with that cam?? Will it idle okay??

 

I have no idea, I've never used an LT1 cam with a TBI. I am however using an LT1 with my TPI right now, and it runs just fine and has decent power. That LT1 cam should be small enough to run fine with the TBI, but I make no promises.

 

Don't forget the 305 TPI 5spd cam-87-89
It's almos thte same as the 350 TPI cam.
(or 90-90 5spd with the dual cats)

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88 IROC the best RS ever made!
well except for the B4C

 

I said use the LT1 cam because it has the same duration, but more lift. Lift is good.

 

Do you have the specs on the LT1 cam?? And would it be a simple switch if I got one?? Will I have to mod alot of other things??

 

Check http://www.f-body.org/tech/ in the 4th gen section for the specs on the LT1 cams.

 

Will a Lt1 cam go straight into my car?? Do I need new bearings and other parts?? Also, if I port and polish my intake, would that be pretty good, or should I get an aftermarket one.

Is there a tech article anywhere about replacing your cam shaft??

[This message has been edited by Godti (edited January 15, 2001).]

 

port and polish a TBI intake!? honestly now, the '97 LT1 cam and a new edelbrock TBI (or equivelent) intake.....dont wastetime with L03 dogsh*t.

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 226/230 duration and .477/.480 lift. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter.
13.24@104

 

Well obviously I dont want dogsh!t!! Does anyone have the part number for the edelbrock TBI intake?? I found one on Summit, but it says it does not have the egr and stock alternator bracket does not fit. Would like somemore info on intakes.


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Godti
'89 Trans Am (Red)
305 TBI 5spd

 

Kevin why are you spreading this misinformed filth? It's already been proven that 91/92 305 TPIs, G92 and non G92, have the L98 cam. The ****ing GM factory manual proved it. You just can't wrap your mind around the truth can you?

 

MrJ, are you going to follow me around with that filthy mouth and correct me everywhere I go? I see you didnt correct me about the 85 305 TPI automatic not having the peanut cam. If I really must be thorough to please you, here:

85 305 TPI automatic: good cam
86-89 305 TPI automatic: peanut cam
87-89 305 TPI 5-speed: good cam
90-92 305 TPI automatic and 5-speed with single cat: could have either cam, results are not conclusive yet. Nobody has pulled their 90-92 305 TPI cam and checked it.
90-92 305 TPI 5-speed with dual cats: good cam.
87-92 350 TPI automatic: All have the good cam for that year.

There, are you happy now???

 

You just don't get it. You post a lot, on every section of this site. People look to you as a repository of knowledge. You knew what you said wasn't 100% true, yet you said it anyway. Maybe it's just because that's what you are used to saying. Whatever. My point is, you should know better.

I didn't correct you about the 85 cam because it's already 100% established, proven, documented, verified, and known among the Thirdgen community that the 85 TPI 305s have the better cam profile.

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91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

Built on Wednesday

 

Ummm....Not to inturupt, but, if I get a set of 350 heads of a tpi engine. I know what they are 64cc, could I get them milled to 58cc?? So I can strap them on to a 305 block?? Reasoning being that the valve sizes are different between the 305 heads and the 350 heads, right?? And that would be a good thing right, to increase the valve sizes on my engine.

Big question here is: Would it be worth my time and money ($200 for the heads, and what ever to have them machined)

 

Yes, I am used to saying it. And until its been proven, I am going to keep saying it. You want to prove me wrong, check your cam. Ask other people with speed density 305's to check their cams too. Until then, I am not 100% convinced like you are. Sorry.

Dont put 350 heads on your 305. Its just not worth the hassle. Save up, buy an 87+ 350 engine, and put heads on it.

 

This might be a dumb question but, the cam in my Lo3 is a roller cam, right??

 

right! Just my opinion but 350 L98 or
Iroc B2L heads still would be a big improvement over the factory swirl port crap.
I'd do that to my car....someday

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88 IROC the best RS ever made!
well except for the B4C

 

I don't need to check my cam.... I'll just go to the strip and rack up more mid 14 second timeslips. That, and the GM shop manual are all the proof I need.

 

Umm..not to bring this back up again, but under the new Tech Data ( https://www.thirdgen.org/newdesign/tech/techdb.shtml )The cam for a 89 5spd is not what I was told. I was told I had the 87 305 AT cam. Which conflicts with the new data. I want to know, cause there is not much difference between the one I want to buy and the one that the new article states I have. I dont wanna buy a cam that is similiar to the one I have, you know!!

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Godti
'89 Trans Am (Red)
305 TBI 5spd

 

If you have a 305 TBI, then it has the peanut cam. If you are looking for a cam to buy, the LT4 cam can be had for as little as $135... I forget the place that was selling it for that price, look around the boards, there was a post about it in some thread recently.

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91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

Built on Wednesday

 

D-mn. Wouldn't u have to do other modifications to the engine if u go from a peanut cam to a LT4 Hot Cam?

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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

I was told not to go with the LT4 hot cam. I think it was too much for my engine? Anyways, which one from the tech data charts is the peanut cam??

 

From the Tech Data charts, does anyone know which is classed as the peanut cam??

 

I didn't say "LT4 hot cam". I said "LT4 cam". The regular, non-HOT version. It's a lot milder than the other one.
Oh and for the peanut cam, just look for the one with the lowest specs.... something like .350 intake lift and sub 200 duration.

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91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

Built on Wednesday

 

Thanks

 

The one thats listed as the 87 305 AT cam is the "peanut cam".