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Old 03-31-2003, 10:55 PM
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I am trying to get a little more go out of my stock pontiac 455 with low compression 4x heads about 8:1, 4 bbl Q-Jet, th400, 3:73 rear, in a 4100lbs truck. So I thought I would try a new cam. I got a recomendation from lazercamsand they suggested a cam @ .050: 243 243, lift 511 511, lash .026 .028, LS 106, with 102 intake center line. obvosily they reccomended all the related parts. I dont have alot of experience with cams and I was concerned that the lobe separation would give me a narrow power band? What other cams would work good? will this work with a stock converter? This is mainly for street use but I would like some tire smokin fun. Thank in advance for any input..

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Old 03-31-2003, 11:20 PM
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i would drop in a set of edelbrock perfomer rpm 87cc heads there about $1,700 dollars but u need to get that compression ratio up or try installing speed pro pistons will raise compression ratio to 11.7 and will run u about $270 bucks will add a good amout of hp if u want a cam go with comp cams magnum cam in summit $116 bucks
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Old 04-01-2003, 06:15 PM
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Brick, with todays gas stay with the low compression but change to a set of 6X heads from a 350 or 400 pontiac due to smaller chamber sizes and have a good 3-angle valve job done. Also if you can afford it have some port work done and have the heads flowed. Using the 350 heads with net a compression ratio of around 9.5:1 and the 400 heads will net you aboout 9:1. If this truck is street driven alot and requires alot of low and mid range I would recommend using an 068 Ram Air III cam. The Lazer has way to much duration for a low compression engine such as yours. Using this cam will cause you nothing but grief, you will have no low end torque and the Lazer will require a compression ratio of no less than 11:1 and a stall converter of around a 3200-3500. This combination would make the truck less streeetable and a bear in traffic. Also it would require using 115 octane racing fuel mixed with 93 octane pump gas. Another cam you could use is the Comp high Energy with .454 lift and 268 degrees advertised duration. This will work in a low compression engine such as yours and you use your stock convertor. This cam also provides loads low
and mid range torque and horsepower. I hope this helps. I have set up various cams in several Pontiac engines and build, drive and race Pontiacs exclusively and have for nearly 17 years. I can say from experience that high compression Pontiacs are not pump gas friendly without octane booster or adding racing fuel to give the engine what it needs and Pontiacs respond well to dual pattern cams.
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Old 04-02-2003, 09:05 AM
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Grusome Goat, thanks for the informative reply. I have been looking into a different set of heads such as the 6x. I have been doing alot of reacerch and 9.5:1 seems to be the majic number pontiac guys are looking for. I will look into the cams you suggested. Thanks again.
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