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Old 04-16-2006, 09:47 AM
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sb 280h cam

will a 280h hydralic flat tappet cam with .480 lift fit ino a stock 350 1975 motor with out any modifications i also have roads lifters to improve bottom end abit. ?????? if not what will i need to do???

i also have 670 holly d/p with a holly torker. with headers

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Old 04-16-2006, 11:55 AM
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Probably. But will you be happy with that much cam in a low compression stock smog era engine and probably stock stall speed?

You really need a low rpm dual plane intake and new valve springs.

Last edited by xntrik; 04-16-2006 at 12:02 PM.
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Old 04-16-2006, 12:10 PM
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I agree with XNTRIK. I am running the same cam in my build, I have 10.5-1 compression, dual plane intake and a 2800 stall. Without the stall you will have trouble getting it to idle good. Lifter are not going to improve the bottom end, just necessary(sp?) witht the new cam. It will fit though.
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Old 04-16-2006, 12:55 PM
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Is it a vacuum advance distr? If so you'll have a hell of a time trying to get it to idle without enough vacuum from low c/r and big cam.
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Old 04-16-2006, 02:11 PM
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yes i have a vacum distributor. but these roads bleeder lifters are supose to help with bottom end more vacrum and torqe. they said it helps restore 25% of lost bottom end. but i am 17 and want to tear up those rice eaters. this will be my first cam installation. any pointers to help me?
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Old 04-16-2006, 03:33 PM
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The motor will be slower with the 280 cam (even with the Rhoads Lifters) than it would be with the stock cam. You will be totally mis-matched with the static compression ratio and camshaft duration (intake closing point).
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Old 04-16-2006, 04:09 PM
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Quote:
Originally Posted by chevelle4542speed
yes i have a vacum distributor. but these roads bleeder lifters are supose to help with bottom end more vacrum and torqe. they said it helps restore 25% of lost bottom end. but i am 17 and want to tear up those rice eaters. this will be my first cam installation. any pointers to help me?
Yes....... Nitrous.
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Old 04-16-2006, 04:24 PM
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I agree with the others .You would be better off using the 270 Comp Cam and a Edelbrock RPM intake . This was similar to an I built a few yrs ago except FT pistons and pocket ported 461 heads.
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Old 04-16-2006, 04:31 PM
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Quote:
Originally Posted by TroyBoy
I agree with the others .You would be better off using the 270 Comp Cam and a Edelbrock RPM intake . This was similar to an I built a few yrs ago except FT pistons and pocket ported 461 heads.

CompCams series XE 258 or 262 cam is about as big as you can stand and you still are going to have to put springs and timing set in it/// and watch that valve lift clearance.

Not knowing your vehicle, I would suggest that unless you are racing against an 82 Accord, you are going to need nitrous and not a cam.

Good Luck.
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Old 04-16-2006, 05:51 PM
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well i have a 70 chevelle. but any ways i have what i think is a 305 sb but i cant find the numbers on nastyz28 or mortec .com but the numbers are for the head is 4022601 if this is a 305 and it has smaller chambers then wouldnt this give me the c/r i need to run this cam. but i worry that this head flows less than the ones i have. wat r your thoughts? heads i have now are 76 chamber with 1.94 intake and 1.5 exhaust vavles.
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Old 04-16-2006, 05:58 PM
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Yes,these heads flow less and have smaller valves.What are your block #'s
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Old 04-16-2006, 06:01 PM
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307 thats what i think. numbers are 14013201 the 3 maybe a 9 or 8 but i think it is a 3
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Old 04-16-2006, 06:11 PM
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I think your 3 is a 0 because the #'s for the block match up with the head #,s.But on the bright side ,run a summit cam #Sum-K1102 with a alum. 2 plane intake , 600 cfm-Good sound and power!
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Old 04-16-2006, 06:28 PM
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If you want you're engine to have a little more kick, without getting higher c/r pistons. Get a cam within 206-210 degreee intake and exhaust durations @ .050" for that 350. You will gain more low-mid range power with a carb in the 525-625cfm range on that relatively stock 350, and what diameter headers are you putting on?
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Old 04-16-2006, 06:29 PM
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should i use these heads to bump my c/r? or stay with my old ones
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