274HO6 with stock valvetrain,converter? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-11-2010, 02:31 PM
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274HO6 with stock valvetrain,converter?

I have an '80 Trans Am with a 355 SBC, TH350, 4.11's, mild cam, not sure what grind, and 993 heads. Very mild build to say the least. Now, I need to pull the intake (think I have leaky gasket), and I'm installing a new gear drive. I thought it would be a good time for a cam swap. I'm leaning towards a 274ho6 grind, was wondering if stock converter is ok, and if stock valve springs are ok. Im not a racer, just a cruiser, and would never be over 5000 rpm. Thanks for any input.
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Old 02-11-2010, 02:45 PM
How fast is fast enough?
 
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That cam will work fine wth an otherwise stock engine but it works best with about 9.5 compression and a good exhaust system. If you're running a stock conv. I'd install it an additional 2 degrees advanced. Headers and a free flowing exhaust will make a noticable improvement with this cam.

For springs I woul drun the "z28" springs, you can get them for less than $30 a set. Seem slike chep insurance.

BTW Elgin makes that cam and Summit sells a reboxed cam kit for $130.

I'd rethink the gear drive. A good roller timing chain is adequate.

Just found that cam, and a taiming chain an lifters together in a kit for about $100 from northern auto parts. the cam is E-1785-P

http://catalog.elginind.com/app/Engi...gh+Performance

Competition Products sells the cam and lifter kit for about $100 too,
http://www.competitionproducts.com/E...tinfo/E1785PM/

Last edited by ap72; 02-11-2010 at 02:51 PM.
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Old 02-11-2010, 03:03 PM
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I was hoping you would see this , cause I've seen you talk about this cam before. I have headers and dual exhaust, and will be getting better heads with stronger springs mid summer. Just wondered if I could run with stock springs until then. Whats involved with changing them with heads on vehicle, is it a big deal? You keep up the good work, you have the best answers on here.
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Old 02-11-2010, 04:03 PM
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Quote:
Originally Posted by phanline6.6
I was hoping you would see this , cause I've seen you talk about this cam before. I have headers and dual exhaust, and will be getting better heads with stronger springs mid summer. Just wondered if I could run with stock springs until then. Whats involved with changing them with heads on vehicle, is it a big deal? You keep up the good work, you have the best answers on here.
You could if you keep the revs at/under 4000 maybe 4500. If the lifters loft off the lobe, it's kiss the new cam good by. But actually running it for a while more slowly with lighter springs would be a good way to break it in. But you've gotta keep the revs down.

Bogie
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Old 02-11-2010, 07:26 PM
How fast is fast enough?
 
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z28 springs are dirt cheap. just get those and save the stress. you can use a piece of nylon rope to help swap them. i can write more on that if you PM me. the Z28 springs are all you need, just forget the gear drive get a good chain set up and use the money you save to get the springs.
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