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Author Topic:   cam help
scorz1
Member
posted February 18, 2004 04:51 PM
Ok here it is. I've been reading the posts for the last 2 weeks as a new member and i've learned more than i did all last year racin. Thanks. My question is I have a new cam someone gave me. Its a speeway 238 244 @ .50, 298 300 dur. 502/516 lift. I am running a mostly stock lower end except for balancing and arp bolts. Have 305 heads with the high strength springs and studs pinned. Also have the anti pump lifters. Is this a good combo. Last year with a 480/490 lift cam turbo 350 in 2nd and 373 gears I didn't reach 5000 rpm. Switched to a 3ring saginaw with the 373s turned 7000 but started over heating after six laps. This year I got 342s and up one size tire. my final drive will be around 6.4 on a 3/8 clay low bank. Will that combo cam work allright? Thanks

I forgot to mention 2 barrel roch. 2GC with a canada intake. Can't port or polish anything.

[This message has been edited by scorz1 (edited February 18, 2004).]

joetaylor
Member
posted February 18, 2004 05:36 PM
I run a simuler track with a 355 simular to yors Irun a 411 rear and saginaw 3speed in second gear @ about 6200 our final is a 722

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U LIFT U LOOSE


scorz1
Member
posted February 18, 2004 05:48 PM
We are limited on the gears, Our stocks can only run 373s. I run 225 70 15 and with the 373s I was close to 7000. This was in the final race last year and I may not have worked out the bugs. I changed to 3rd so I didn't blow up. Also the 2nd gear in a 3 ring sag. is 1.89. You may have a dif. saginaw.


scorz1
Member
posted February 19, 2004 05:25 AM
quote:
Originally posted by scorz1:
Ok here it is. I've been reading the posts for the last 2 weeks as a new member and i've learned more than i did all last year racin. Thanks. My question is I have a new cam someone gave me. Its a speeway 238 244 @ .50, 298 300 dur. 502/516 lift. I am running a mostly stock lower end except for balancing and arp bolts. Have 305 heads with the high strength springs and studs pinned. Also have the anti pump lifters. Is this a good combo. Last year with a 480/490 lift cam turbo 350 in 2nd and 373 gears I didn't reach 5000 rpm. Switched to a 3ring saginaw with the 373s turned 7000 but started over heating after six laps. This year I got 342s and up one size tire. my final drive will be around 6.4 on a 3/8 clay low bank. Will that combo cam work allright? Thanks

I forgot to mention 2 barrel roch. 2GC with a canada intake. Can't port or polish anything.

[This message has been edited by scorz1 (edited February 18, 2004).]


How bout it any info on the cam and anti pump lifters

towmandan
Member
posted February 19, 2004 05:44 AM
Im not a big fan of the lifters but Ive seen alot of guys run them....As far as the cam goes it sounds like it should work well for you..Im also not a big fan of the 305 heads I ran a set once and they work ok on a short 1/4 mile track but they were ported and had 1.94 in 1.60 ex. on a 3/8 or longer they dont flow well enough if you could run a set of humps or vortecs they would be a major improvement.....As far as the gear goes I ran a 4.11 with a 1.89 2nd gear in a 2800 hobby stock with a 86 to 87 roll tire and turned 7800 on a 1/4 mile track and I love that set up but it takes good equipment to turn one like that all season....hope this helps.....Towman

[This message has been edited by towmandan (edited February 19, 2004).]

scorz1
Member
posted February 19, 2004 05:55 AM
We can't run the humps or the vortecs and I don't think I could turn 7000 to long. Thanks for the info.


towmandan
Member
posted February 19, 2004 06:08 AM
Sounds like your getting close on the gears 6000 to 6500 is about all Id turn one on a stock bottom end......another question do you think you could get by with angle milling heads you could make alot more power with a set of 441s but there a open chamber and you wouldnt have enough compression without angle milling.....Just trying to help...Towman


racerman707
Member
posted February 19, 2004 06:54 AM
if youre allowed to shave the heads a set of 882s might work best.


Raz_900
Member
posted February 19, 2004 08:23 AM
Is everybody else missing the 2bbl carb thing? I'd think trying to get up around 7000 with that carb is like sucking gear lube through a coffee stirrer.

With the carb limit, compression is your friend. Are the 305 heads 601/416 or something else? If they are the bigger valve castings to begin with, 1.94/1.6 valves and a cleanup mill will get you down around 54cc. That'll give you a touch of 11:1 with flat tops. The big chamber (76cc) heads even cut down to 68-70cc probably won't make up for the 2 point comp. loss unless you can run above 6000rpm. But the carb will keep you from getting up that high. So it's a wash and just cost alot of money to change heads.

I'd gear it for around 6000-6200 max (that's about where that cam will wanna run, maybe a little lower) and spend some time looking at the ignition. A good module, coil and 16V battery will do wonders. I prefer the 16V battery over a alternator or running a 12V battery and having to charge it constantly.

scorz1
Member
posted February 19, 2004 07:01 PM
Thanks everyone, I,m not sure what the heads are. They came of an 84 monte. The guy who does the heads said they were the ones I needed. I'll try to get #s of them. It's a 500cfm 2barrel.
I am trying to get the gearing right around 6200 or less. I'm also wondering about the anti pump lifters.I thought I read in one of the posts that they act like a solid lifter. Do I need to adjust them like a solid or set them up any special way. They didn't come with any paperwork.
PS the builder shaved the heads and said I was at 11.1

[This message has been edited by scorz1 (edited February 19, 2004).]

dan ferry
Member
posted February 20, 2004 09:34 PM
you adjust the anti pumps like any hydaulic zero lash then a half turn to pre load the lifter this is important in a hydraulic lifter and the antipump part is what it means they arent supposed to pump up at highr rpms like cheap stock ones will and float the valves.


dan ferry
Member
posted February 20, 2004 09:39 PM
this also may add controversy but id kill the long duration on the cam a little and run a single pattern cam on a 106 lobe sep atleast to try to build torque the 305 heads and possiblt cast crank are gonna mess up a high rpm set up.


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