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post #1 of (permalink) Old 08-27-2001, 10:44 AM
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Question about my heads...

Hey guys,
I was wondering if anybody had any information about the heads on my truck. Its a 1987 GMC full size with a fuel injected 350 and I plan on doning a cam job to it soon and I was wondering what cam I should use. Any suggestions or information??? Thanks

Kimball

1987 GMC 1/2ton 4x4
350 FI Daily Driver
1970 Camaro money pit
project car

If ya can't be good be careful...
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post #2 of (permalink) Old 08-27-2001, 07:48 PM
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Re: Question about my heads...

The heads for an 87 350 with TBI are nothing special, and there is nothing bad with them either. The main concern with changing cams with a TBI is the vacuum signal. A cam with to much lift or to much duration will not make enough vacuum for the computer to work correctly. There are several aftermarket cams that are computer friendly. I like the cams from Competition Cams. I'd suggest using the mild Xtreme 4X4 cam from Competition Cams.
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post #3 of (permalink) Old 08-27-2001, 10:57 PM
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Re: Question about my heads...

edelbrock and crane make good cams for computered trucks.

check out http://www.mortec.com for more casting info

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post #4 of (permalink) Old 08-28-2001, 06:14 AM
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Re: Question about my heads...

I'll check those cams out and figure out which is best for my truck. I'm also planning on replacing the throttle body with the holley replacement unit anybody heard anything about it.

Thanks again fellas

Kimball

1987 GMC 1/2ton 4x4
350 FI Daily Driver
1970 Camaro money pit
project car

If ya can't be good be careful...
post #5 of (permalink) Old 08-28-2001, 07:12 AM
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Re: Question about my heads...

I think hollleys TBI IS JUST A RPLACEMENT unit so there wont bet tomnay gains with it.

http://www.turbocity.com reworks stock tbi units to flow more air and also flows it smoothere they also nhave balanced injecters to throw in the unit, thats the route itd take if I was doing it.


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post #6 of (permalink) Old 08-28-2001, 07:32 AM
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Re: Question about my heads...

I've had the throttle blades of a stock TBI increased in diameter. Check with http://www.turbocity.com for current prices of modifying a TBI with larger throttle blades and other TBI performance upgrades.
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post #7 of (permalink) Old 08-28-2001, 09:42 AM
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Re: Question about my heads...

I think dave nailed it well... not that good, but not that bad on the heads. You can look into the new GM performance parts TBI HP heads. I know SDPC has them on their site. That would give you a bolt on replacement, that or go Vortechs.

Almost every major cam manufacture makes computer cams now... I personally like Crower and Cranes. The Holley TBI isn't worth it... go w/ the modified turbocity unit.

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post #8 of (permalink) Old 08-28-2001, 10:30 AM
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Re: Question about my heads...

Thanks alot for the input. I never heard about turbo city before so I went there and I think I will order the high flow TBI unit besides its cheaper than the holley too. As far as the heads are concerned I wont be replacing them in the near future, but I think the cam, throttle body, prom chip, and jacobs ignition system should wake it up pretty good for now since it isn't real slow to begin with.

Thanks alot guys,

Kimball

1987 GMC 1/2ton 4x4
350 FI Daily Driver
1970 Camaro money pit
project car

If ya can't be good be careful...
post #9 of (permalink) Old 08-28-2001, 11:21 PM
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Re: Question about my heads...

If you have a good flowing exhaust system, the hi-flow TBI will really help the engine performance.
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post #10 of (permalink) Old 08-29-2001, 06:21 AM
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Re: Question about my heads...

I do have a high flow exhaust, but I just got an email back from turbocity and they said I would have to use a cam that had 204-206 degree intake duration
at .050 with 112degree lobe centers. Now I'm not saying they don't now what they are talking about, but I would assume I could use a bigger cam. Any thoughts...

Kimball

1987 GMC 1/2ton 4x4
350 FI Daily Driver
1970 Camaro money pit
project car

If ya can't be good be careful...
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