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Old 06-14-2009, 11:25 PM
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Chevy T.B.I. Cam upgrade

Im looking to change out the cam in my k-5. However i would like to keep the TBI fuel injection set up . Most people I have talked to just change over to a carb when they modify.

I researched my stock cam and got :

194/202 - .385"/.403" - 112

I was looking at Comp Cams Xtreme 4x4 Hydraulic Flat Tappet Camshaft

250°/258° -.432''/.453'' RPM Range: 600-4600

I wasnt sure if this would be too much and if I would need it tuned
and if so would i be able to do it my self

* Also how heavy should the valve springs I get be ??????

---Thanks---
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Old 06-14-2009, 11:49 PM
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My truck stock makes 210 hp and i thought it could use some help breathing !!!!
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Old 06-15-2009, 03:18 AM
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Msd makes a good product for TBI chevys stay with the TBI in my opinion..... u runnin track or just streets or bothÉ
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Old 06-15-2009, 09:05 AM
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Quote:
Originally Posted by MY88K5BLAZER
Im looking to change out the cam in my k-5. However i would like to keep the TBI fuel injection set up . Most people I have talked to just change over to a carb when they modify.

I researched my stock cam and got :

194/202 - .385"/.403" - 112

I was looking at Comp Cams Xtreme 4x4 Hydraulic Flat Tappet Camshaft

250?/258? -.432''/.453'' RPM Range: 600-4600

I wasnt sure if this would be too much and if I would need it tuned
and if so would i be able to do it my self

* Also how heavy should the valve springs I get be ??????

---Thanks---
Think more like XE249H, this is made for Throttle Body engines. TBI is very sensitive to manifold vacuum, cams for it will say they are "Computer Compatible". To use a cam that isn't computer compatible, you will get into a tuning nightmare requiring a modified chip or in some instances there is no help from the chip as the sensors simply aren't sensitive enough to provide reliable information in small enough increments.

The 249 cam will use stock TBI springs.

Your heads are very limiting, this engine uses the Swirl Port which is quite intake flow restricted. While many people prefer the Vortec head, it requires a special and expensive intake to adapt to TBI. Factory heads that will be a flow and power improvement and bolt to your TBI intake is casting number 10088113 which is the aluminum L-98 it comes with 72 or 90 degree center manifold bolts, you want 72 degree. In cast iron 14101083 or 14096217 will work.

Your computer has a governor that shuts off at 100 mph, the only way around this is a custom chip.

Bogie
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Old 06-15-2009, 04:47 PM
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I have already looked into vortec heads and the gm performance parts intake was over 300 and each head was 299.
So i didnt want to spend a 1000 on everything.

I do know that the stock late 80s heads are very restrictive but with a light cam i dont think that they will need to flow like crazy. But if there are cheaper heads i can get i would still change them

All that I am trying to do is get a little more horsepower but still keep it an every day driver. And not destroy my mpgs completly.

I do like the TBI because of its reliability my truck is great but it is so slow.
I have a 700R4 tranny and 3.42 rear gears on 31x10.50 R 15 tires

I also think my computer stops the truck @ 95mph because even down hill i havnt gone faster then that at full throttle but once again im not looking to be doing any insane speeds

* I was also looking at TBI spacers, does anyone know if they work????
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