What cam to use

Asked by Jul 25, 2015 at 12:44 AM about the 1983 Chevrolet Blazer

Question type: Car Customization

I have a 83 k5 blazer,was a diesel but
blew motor and put a 350 in it.bone
stock...trying to get a little more
power out of it.but not to much
because it's an everyday driver..I'm
trying to find out what cam would b
best for it and if I should go with 1.6
or 1.5 roller rockers
The truck is on 35's with a 6inch
lift,has aftermarket
exhaust,Edelbrock intake and
carb,and 486 gears.any help would b
much appreciated....

10 Answers

27,805

here.. go with a big rv cam +/-.. after change to 1.6 intake rockers on intake first..see if its better or slower... then change the exh..to see the same..what that does is tell you if you intake/carb is good/close.to small/to big...same with exh... anyway heres a start ..without your comp/year engine ..will you degree your dist to put in all the timing by 3000 rpm ??? try is link if to big go down 1 size..you can always beef up the stuff.. run a wood spacer under the carb... tune the collectors....>http://www.compcams.com/Company/CC/cam- specs/Details.aspx?csid=1&sb=2

1,595

Try Crane Cams. You're limited to a mild street hydraulic cam because of low compression flat top pistons. A cam & kit is recomended with hyd roller lifters & valve springs. Go for a torque cam (longer duration cam like 384 degrees duration) & not high lift cam. Unless you plan to change the Pistons to high compression type & notched because the valves will hit.

1,595

RV cams are OK because they are duel profile, more duration on the exhaust lobes. Good for towing. Buy some tube headers.

27,805

well any cam that makes TQ for his set up we call RV..go for a rv cam for the TQ.....and think james above said to go with a 384o cam Duration @ .050" Lift:.. i think he meant 284o ..and even at that if thats the speck Duration @ .050" Lift: its still to big....anyway >Xtreme 4x4™ X4262H; Hyd. Flat Tappet; '58-'98 Chevy Small Block >Part:comp cams 12-239-3... go with a cam like below..you should get new rockers,,even hp stock 1.5 are better than the factory cause one might be 1.35,one might be 1.54, one 1.48 ..this is why you blueprint... so just order a set of 1.6 rockers.. also you can call herbert cams...best grinds for the price..tell them what you have and say i need something a little smaller than a 30-30 gring for solids or cross over for hyd... here a little picture of my 280z im putting together..350 ci street dot class 10.0 car

1,595

I didn't say a 284 cam was a RV cam. I used it for TQ in a 440" Barracuda with outstanding results! I used a duel profile RV cam in a 307" Chevy pickup truck.

27,805

you said >Go for a torque cam (longer duration cam like 384 degrees duration) i think you just hit the 3= 384o instead of the 2= 284o...im just trying to keep him in the under 240 @50 duration range.. here again is the cam he is asking for>Part:comp cams 12-239-3.

27,805

also after the fact if he puts on 1.6 rockers and it runs slower..than the cam is to big...if he puts on 1.6 rockers and its quicker...than the cams to small...but in a good way..

27,805

james i was not/did not mean you any disrespect..so u a dodge or chevy guy...u know that makes a lot of difference here...

1,595

Both, short answer. I'm 65 now & had over 40 cars in my lifetime! I raced a big block 440 Baracuda & a 69' 427 L-88 Camaro and everything inbetween, trucks too. Latley I'm into sports cars like a Cooper Works Mini-S and a turbo Fiat Abarth. I love small 4 bangers with 200-250 hp & 40 mpg.

27,805

wish we still had them .. your L88..yum...i have modified L88 ZL1 heads on that chevelle...like my second car a 64 ford thunderbolt...yep .. blew 2nd gear 2 times and the last time my dad put it together without 2nd.... .built an opal kadett,4 banger..lift the motor out by hand.... i now love big strokers..that get 4 mpg...

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