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Discussion Starter · #1 ·
Hello all, I need your help regarding math :barf: lol. I've been searching the web looking for the specs of the 1975's 350 factory cam but nothing has turn up. I wanted this information so that I can figure up the new lift I'll have when I install my new cam and 1.6 roller tips.

Any info provided will be much obliged :beer:
 

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If you're trying to determine lift, all you need to know is the lift of camshaft that you're going to use and the rocker ratio. The camshaft that came in the motor back in 1975, means nothing.
 

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.. intake lift .390 ex lift .410 intake dur. 310* exhaust dur. 320* rocker ratio 1.50 part number 3896929 casting number 3896930 casting symbol horizontal diamon, This is for 350 ci 145,155,165 hp and 400 ci at 175 hp.. Now the 3896962 is rated at 205 hp in 350 ci. { .450 intake lift .460 exhaust lift 346* dur.on intake and 360* on the exhaust side casting # 3896964 casting symbol; Vertical diamon}..:dontknow:
:beer:
 

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Discussion Starter · #4 ·
.. intake lift .390 ex lift .410 intake dur. 310* exhaust dur. 320* rocker ratio 1.50 part number 3896929 casting number 3896930 casting symbol horizontal diamon, This is for 350 ci 145,155,165 hp and 400 ci at 175 hp.. Now the 3896962 is rated at 205 hp in 350 ci. { .450 intake lift .460 exhaust lift 346* dur.on intake and 360* on the exhaust side casting # 3896964 casting symbol; Vertical diamon}..:dontknow:
:beer:
THANK YOU VERY VERY MUCH SIR!!!!!!! YOU'VE MADE A YOUNG LADDY VERY HAPPY :nanawrench:

If you're trying to determine lift, all you need to know is the lift of camshaft that you're going to use and the rocker ratio. The camshaft that came in the motor back in 1975, means nothing.
I wanted the old cam specs because..1) I wanted to document the before and after cam specs and..2) I saw online that i had to put in my old lift numbers, then multiply them by the rocker ratio or something along those lines..
 

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Discussion Starter · #7 ·
see! your teachers were right! You will be using math your whole life!!

unless you run a cash register :let_it_all_out:
LOL keyser, as i was multiplying and dividing my lift specs, i said "God, im glad im out of school" lol then i checked the thread and you posted that lol made me laugh.

well, my cams specs are Int.-0.420 and Exh.-0.442 (with 1.5 rockers)
i divided each with 1.5 and got Int.-0.280 and Exh.-0.294
i then multiplied that by the new 1.6 rocker ratio and got....DRUM ROLL PLEASEEEEEEE...................

my new lift of Int.-0.448 and Exh.-0.471
 

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Discussion Starter · #8 ·
Yes you will, coming from a High School Geometry teacher. lol
GEOMETRY!!!!!!! >CAT HISSSSSSSS< (puts up fingers in a cross formation) lol just kidding
 

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Discussion Starter · #10 ·
LOL :nanawrench: thanks everyone :You_Rock:
 

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Yes you will, coming from a High School Geometry teacher. lol
Sorry, not to hijack the thread but.... Funny story you will appreciate ZerberFert,, 1970, Guidance councler stuffed me in a class called "Geometry / Introduction to Trigonometry". Second day I was smarting off in class (the typical I didn't understand so I was being the class clown) Teach shut me up with "If you don't 'WANT' to be here I'll sign of on a transfer to ANY other class you want." Being 16 and smarter than everyone else in the world I thought,, HA, what the hell would I ever need this CRAP for!!! I'm outta here!!!!!

Fast forward a couple of decades... I've been in / running my own Land Surveying business since the mid 80's,, You know, since before computers did all the trig calcs!!! Yeah.... what would I ever need that crap for <LMAO>
 
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