ive got a 307 laying around that I wanna throw in my daily driver '82 s10. car will not need to pass emissions. basically this is what it is

307
all stock internals
edelbrock rpm intake
edelbrock 600 carb
compression is at 8.5:1 , but I might add 305 heads later on to bump up
compression.
jegs 2300-2700 converter
4.10 gears
headers

im lookin at 3 cams

comp xe262h
Operating Range:1300-5600 RPMDuration Advertised:262° Intake / 270° ExhaustDuration @ .050'' Lift:218° Intake / 224° ExhaustValve Lift w/1.5 Rockers:.462'' Intake / .469'' ExhaustLobe Separation Angle:110°

crane 272h
Grind Number:272 H10Operating Range:1600-5400 RPMDuration Advertised:272° Intake / 272° ExhaustDuration @ .050'' Lift:216° Intake / 216° ExhaustValve Lift w/1.5 Rockers:.454'' Intake / .454'' ExhaustLobe Separation Angle:110°Max Lift Angle:105° ATDC Intake / 115° BTDC ExhaustOpen/Close @.050'' Cam Lift:Intake - 3° BTDC (opens) / 33° ABDC (closes)
Exhaust - 43° BBDC (opens) / (7°) BTDC

crane 274h
Grind Number:274 H06Operating Range:1800-5800 RPMDuration Advertised:274° Intake / 274° ExhaustDuration @ .050'' Lift:218° Intake / 218° ExhaustValve Lift w/1.5 Rockers:.450'' Intake / .450'' ExhaustLobe Separation Angle:106°Max Lift Angle:102° ATDC Intake / 110° BTDC ExhaustOpen/Close @.050'' Cam Lift:Intake - 7° BTDC (opens) / 31° ABDC (closes)
Exhaust - 39° BBDC (opens) / (1°) BTDC (closes)

 

Me personally, as far as budget goes, I don't think you can beat the specs for the Edelbrock performer RPM cam. I ran the 79 dollar rip off version (from PAW and Summit) with a set of 80 dollar .600 lift single valve springs from PAW with absolutely awesome results. I did use a 750 carb with a used performer RPM intake and some cheap 1 3/4 long tube headers from a swap meet. I just can't express how impressive that setup was...

Anyway, just my two cents!!!

 

with any of my choices will I need to replace the stock valve springs??

 

i think you will with the comp cam they probably recommend thier 981 springs

 

Im leaning more towards the crane's because of the price. will the 272h have much of a lope? and how would the 274h perform with the 8.5:1 till I get my 305 heads.

 

I have a 447" cam in my 350 and it has a slight lobe you can tell it has a cam and with a smaller motor like(307) that it will chop even harder and it will sound really good

 

of the three i think the comp XE262 is the best overall choice.

Live with it till you get the 305 heads.
Search my posts on home porting "416" 305HO heads. May even want to shave 'em a bit especially if the 307 has a dished piston. 52cc's is no problem.
You can use the 350 thin .015" steel shim head gasket if you want. Use a 1.94x 1.50" valve set in the 305 heads for the 307.
On a stock bore 307, with flat top pistons, finish the 305 heads to58cc and use the thin head gasket.
If it has dished pistons, shave the heads to 52cc. again with the thin gasket.
basicly you'll be right at the spark plug boss and intake valve seat. use champion RV8C plugs in these heads for max performance.

 

https://www.thirdgen.org/forums/tech...selection.html
there is a pic of a max flat milled 305 head in my post , within this thread. Finished chamber size was 52cc.
Notice the spark plug boss.

 

Well you've gotten suggestions so far for the 2 ABSOLUTE ALL-TIME WORST CAMS you could possibly use. The RPM cam; and the "151" from GM.

Don't use either of those. I can't think of any quicker way to a disappointment.

Given that this is ayou should stay away from buying a cam for its "sound". That's a very expensive way to operate a car.

I totally agree with the 305 heads and XE262 combo. The larger exhaust lobe REALLY HELPS with stock poor-flowing exhaust ports.

Screw the price. The difference in price is PEANUTS. You'll make it back in cash you spend on fuel within the first month of using it, and then it will continue to put that profit back into your pocket every month for the rest of its life. And that is in addition to your satisfaction with the results you get. Get the cam that will work the best, no matter what it costs, because chasing the bottom dollar cam will take you right straight to the bottom satisfaction.

 

Or just get a pair of 601 castings, they are 52cc out of the box. They have a small closed chamber, 1.84/1.50" valves, and flow better than the 416/081s in stock trim. They flow just as well as ported 416s if not better when ported. The chambers are also shaped just like the old 492 chambers are in the 350s.

Sofakingdom- I was honestly thinking a cam along the lines of the XE256.

If he didn't mind buying a new intake manifold, the 520/059 Vortec heads flow very well (only a few % less than the 350 vortecs) and have 56cc chambers. They off the same fast burn as the 350 heads.

 

I agree, the XE256 (the next step down from the XE262) would also be a good choice. The main thing you want to do is avoid over-camming it. Remember, there's no such thing as "too much cam", only "not enough motor"; and the 307 is the perfect picture of "not enough motor". You'll be happier with LESS cam than MORE cam, guaranteed. Those always were like that; they had low compression and poor flow, which when mismatched with a "big cam", is a recipe for a sluggish gas-sucking turd. I can't BEGIN to tell you how many of those I got the opportunity to laugh at back in the 70s, when people were so frustrated with the lameness of the new cars of the day, compared to late 60s muscle.

 

"Or just get a pair of 601 castings, they are 52cc out of the box. They have a small closed chamber, 1.84/1.50" valves, and flow better than the 416/081s in stock trim. They flow just as well as ported 416s if not better when ported. The chambers are also shaped just like the old 492 chambers are in the 350s."

Just so there is no confusion, *Some 601's* have small 52cc chambers (the ones from 267ci motors) Some are as big as 60cc. They flow a little less than 416's in stock form. The 416's flow more when fully ported. There is a big difference in the chamber shrouding. If/when you deshroud the 601 to flow as good a the 416's the chamber will now be just as big as 416's or bigger. (takes a serious amount of metal removal). No longer going to be 52cc without milling.
the 416 have a bigger "non restricted intake port" to start with.
Don't confuse any of these heads with 492's. Not even close.
You can make a pretty good budget head out of the 601's but the 416s come out better. Best power potential.