306cid camshaft?

Black95GT_Kid · Apr 10, 2006

im building a 306 with stock heads and intake port matched or possibly a cobra intake and i put a thread on here sayin that i was goin to use a e303 cam and was told to use a different cam so i found a crane cam with a Duration of 276/ 282, and a Lift of .513/ .529 is this better?

Joes95GT · Apr 10, 2006

Black95GT_Kid said:
im building a 306 with stock heads and intake port matched or possibly a cobra intake and i put a thread on here sayin that i was goin to use a e303 cam and was told to use a different cam so i found a crane cam with a Duration of 276/ 282, and a Lift of .513/ .529 is this better?

Those are the advertised duration numbers. What are the duration numbers @ 0.050"?

Joe

Black95GT_Kid · Apr 10, 2006

the duration at .050 inch is 214/220

Joes95GT · Apr 10, 2006

That cam would work pretty well by the sound of it. What is the LSA?

It has decent ramp rates with 1.6 rockers, but if you wanted more performance, you could throw on 1.7 rockers. The only problem is that you are going to need a GOOD spring. Probably something with about 130-140 on the seat and 360 open. They are probably going to be kind of hard to find because I believe the spring pockets for the E7 heads aren't that wide....

Joe

Black95GT_Kid · Apr 10, 2006

i already have cobra rocker and new springs i put on a few months ago but thanks for the advise. im not entirely sure what the LSA is but i think it is 112

95snoozer · Apr 10, 2006

better put a cobra on it or you are gonna slow down with a cam and stock intake/stock heads

I would just leave your stock cam in there and maybe retard it 4 degrees with the cobra intake

of course i ran a stock piston 302 with stock e7s and an e cam 1.7s and cobra and rpm intake. it worked well for me, but you will have much less headaches and the same results with a stock cam

Joes95GT · Apr 10, 2006

95snoozer said:
better put a cobra on it or you are gonna slow down with a cam and stock intake/stock heads

I would just leave your stock cam in there and maybe retard it 4 degrees with the cobra intake

of course i ran a stock piston 302 with stock e7s and an e cam 1.7s and cobra and rpm intake. it worked well for me, but you will have much less headaches and the same results with a stock cam

This is true!

I was assuming that he had all the supporting junk too....may have been a bad assumption on my part.

Joe

84convertablegt · Apr 10, 2006

Im a big believer in the stock cam. Im running afr 165's, 1.7 rr, ported cobra intake, and accufab 70mm, and a tune, all with the stock cam. great manners, no computer issues, and pushing close to 290 at the wheels. this is all on the stock 302 bottom end. just a thought. people dont give the stocker much credit, but it can save alot of headaches and is pretty darn good for a street driven car.

95snoozer · Apr 11, 2006

84convertablegt said:
Im a big believer in the stock cam. Im running afr 165's, 1.7 rr, ported cobra intake, and accufab 70mm, and a tune, all with the stock cam. great manners, no computer issues, and pushing close to 290 at the wheels. this is all on the stock 302 bottom end. just a thought. people dont give the stocker much credit, but it can save alot of headaches and is pretty darn good for a street driven car.

did you ever retard your cam?

84convertablegt · Apr 11, 2006

95snoozer said:
did you ever retard your cam?

Nope. What would that do?

wytstang · Apr 11, 2006

IIRC advancing the cam gives more top end power (or moves the power curve forward) while retarding it moves the power back for more lowend grunt. I could have this backwards so don't take it to heart, hopefully some one will correct or confirm this.

Black95GTS · Apr 11, 2006

wytstang said:
IIRC advancing the cam gives more top end power (or moves the power curve forward) while retarding it moves the power back for more lowend grunt. I could have this backwards so don't take it to heart, hopefully some one will correct or confirm this.

You do indeed have it backwards. That's why Snoozer suggested you retard the cam. Its a common and effective trick used by those limited to the stock cam in class racing.

Retarding the cam RETARDS when events occur, thus making them occur later then they "should," higher in the RPMs.

The reverse is true.

Camshafts are retarded for higher horsepower, advanced for low end.

Adam

95snoozer · Apr 11, 2006

84convertablegt said:
Nope. What would that do?

move your powerband a lil higher. It will pull higher, peak higher and make more power. you could see 300 rwhp

I would definitely do it

95snoozer · Apr 11, 2006

If you want you can pick up a "STOCK" cam

one that is made by crower or AFM to the maximum tolerances of a stock cam.

This is what class racers use to maximize every bit of hp

Black95GT_Kid · Apr 11, 2006

i dont want to use my stock cam and i also do not have it. the car came with a cam but i dont know what it is that is why i am putting a new one in when i rebuild it

SVTCobra306 · Apr 11, 2006

Black95GT_Kid said:
im building a 306 with stock heads and intake port matched or possibly a cobra intake and i put a thread on here sayin that i was goin to use a e303 cam and was told to use a different cam so i found a crane cam with a Duration of 276/ 282, and a Lift of .513/ .529 is this better?

Crane 2031 cam is what you listed. I have this cam. Very very drivable untuned. Caused really no issues with the computer.

Few facts: This was originally designed as a blower cam. It will hurt you compared to a custom or even some off the shelf cams with an N/A car. However add a power adder and the wide LSA brings the car to life (I saw nearly 200 RWHP and over 220 RWTQ on a 150 HP shot of nitrous with this cam). The exhaust valve closes earlier on this than an E cam, but the lope is very very similar to the E cam. It's really kinda in between the E and F cams.

This grind was designed for 1.7 RR's (was actually designed with the '93-'95 Cobra motor in mind). It will also typically require longer pushrods, somewhere between 6.300 and 6.310" pushrods.

As for springs Crane sells a cam/spring kit with this cam and specific springs for it. IIRC the closed pressure was like 117 or 120, open around 350. . I personally run FRPP springs on mine, shimmed to a higher spring pressure (don't remember specifics but it was kinda high). No issues with valve float.

SVTCobra306 · Apr 11, 2006

http://www.cranecams.com/?show=brow...=302 C.I.&partNumber=444225&partType=camshaft

Here's crane's link. I was a bit off on the valvespring specs...

306cid camshaft?

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