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View Full Version : picking a cam IS NOT GUESS WORK,



grumpyvette
04-14-02, 03:09 PM
picking a cam IS NOT GUESS WORK,BUT IT DOES REQUIRE YOU TO DO SOME HOME WORK!
the cams rpm range must match your intended use for the engine without going over the engines REDLINE (on any non-all forged chevy v-8s thats 4000fpm of piston speed and even on all forged engines its best to stay under 4500fpm of piston speed)
next the cam must not have valve lifts that cause clearance problems or have lifts much higher than the cylinder heads ports peak flow lift points,the dynamic compression ratio must be in the 8.0-8.5 range for best power and the the cams overlap must match its intended use too.read these posts.
http://www.c4board.com/cgi-bin/ib3/ikonboard.cgi?s=3cb9d124047cffff;act=ST;f=10;t=94
http://www.c4board.com/cgi-bin/ib3/ikonboard.cgi?s=3cb9d124047cffff;act=ST;f=10;t=88
http://www.c4board.com/cgi-bin/ib3/ikonboard.cgi?s=3cb9d124047cffff;act=ST;f=10;t=87
http://www.c4board.com/cgi-bin/ib3/ikonboard.cgi?s=3cb9d124047cffff;act=ST;f=10;t=80
http://www.c4board.com/cgi-bin/ib3/ikonboard.cgi?s=3cb9d124047cffff;act=ST;f=10;t=68

Scott81
04-16-02, 09:55 PM
OK, you just gave me a headache. :Silly

Note to self, something else to read up on.

Bullitt
04-17-02, 07:42 PM
I was always good at homework, but hated it regardless. I'll just write everything down, first. If all else fails, I'll ask someone more knowledgeable than me. There should be a 1-800-Camshaft line. :)

--Bullitt

Rowdy1
04-17-02, 08:29 PM
I have not had the time to be on our site as much as I like to because I've been working on doing a complete rewire of the 62 but I have to give a personel THANKS to grumpyvette for your last few posts. You're right on the money as is the gentleman who coached me through what to put where and why for my engine build up. The exact head gasket set for certain heads with the right lift ,duration, valve springs etc. It is a proven fact with results that speak for themselves. Take the time to read what he's saying if you want that engine to bark. Thanks grump;)

Jack
05-03-02, 09:55 PM
/ grumpyvette ... example
http://dab7.cranecams.com/SpecCard/...B1=Display+Card
here is a hot street cam that works well in carbed 383 engines
now the timeing is intake opens 29.0 btdc, closes 71.0 abdc exhaust opens 77.0 bbdc, closes 31.0 atdc so if we add the 29 to the 31 we get the overlap duration of 60 degs of which makes this cam fall in the center of HOT STREET

Great info grumpyvette ... but I can't get the spec card page to display ... so what cam (mfg pn) is that?

Also, what are your thoughts on these cams specs for a mild street-only 388 w/ iron 76cc 1.94/1.50 heads, 5.7" rods, 9.2:1 STATIC CR, .038" quench w/ zero deck::: specs= 28-84-76-32 (60 degs OL) and 292/288 adv dur OR 224/224 @0.050" and .450/.460 v lift ... cam's purportedly an L82 clone. Your thoughts on this cam application? Thanks ...
JACK:gap

grumpyvette
05-04-02, 12:22 PM
heres that cam, it works very well in carbed 350-383 engines with about 10:1 or better compression and with a good set of high flow heads, headers,intake mods, but it needs gearing (3.73-4.11 works well)and a stall speed that is about 300rpm and greater than stock valve train clearances to get the most out of it! but if you have a 383 in an old camaro this may be the cam your looking for!

http://dab7.cranecams.com/SpecCard/DisplayCatalogCard.asp?PN=114681&B1=Display+Card

if your looking for a kick butt cam for your TPI engine the CROWER #00483 roller works well, the COMP CAMS 12-262-4 flat tappet hydrolic works well but requires a chip and headers

Tom Bryant
05-06-02, 11:21 PM
Great series of posts grumpyvette. Camshaft techology is fascinating reading to me. Can't say enough for a matched component engine or someone that takes the time to help others to understand and make the right choices.

Thanks,
Tom