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Old 06-05-2011, 09:18 AM
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355 build??'s about compression and build

got a 350 im rebuilding for a 4000 lb car with 3.08 gears, im wondering about how much compression i can run with these cams and my heads on 91-93 octane?

heres my parts list, im looking for good low end torque and mid range its just a cruiser not a race car, i am just looking for better performance then the factory gross rated 255hp and 365 ftlbs.

Im ordering my parts from northern auto parts so i am a little limited on cam choice.

355 with flat tops
trick flow aluminum 180cc intake heads, 63 cc combustion chambers
(comp 4x4 x4254h dur 210 218)
(or the xe262 dur 218 224)
headers
performer intake
1.5 roller rockers
660 carb

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Old 06-05-2011, 11:52 AM
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1.21 giga-watts???!!!!
 
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Use the search function at bottom of page. Particular engine combo has been beaten to death. You will find many "recipes".
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Old 06-05-2011, 02:33 PM
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91 octane is not the same as 93. Make up your mind.

10:1 will work well with 93 octane gas. 91 mid grade may want a bit less cr.

9.5-9.8 is fine.
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Old 06-05-2011, 03:53 PM
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4000 lbs and a 3.08 gear will make a big load on the engine.

So, I would say......
9:1 with old school iron heads,
9.5:1 with iron vortecs (as they need less ignition timing)
and 9.5 to 9.75:1 (maybe 10:1) with aluminum heads.

I would avoid xe cams as they have very aggressive lift rates for a flat tappet cam which can make them more prone to go flat and make noise. Plus you don't need extra exhaust duration with those heads and with headers.

I would use an old school 260H and get a more durable cam but at the expense of a little power. 260/260, 212/212 at 0.050".

from northern autoparts

http://www.northernautoparts.com/Pro...ctModelId=8911
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Old 06-05-2011, 09:03 PM
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ok ill probably use that 260h cam then makes sense thats its not as prone to going flat, thanks for the answers, this may be a newb question but whats a rough estimate of what compression would be with flat tops and a 63 cc chamger on a 355
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Old 06-06-2011, 06:54 AM
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CR depends on lots of variables.

assuming the following:
727cc/cylinder (355 cid total)
63cc heads
8.5 cc head gasket (0.040" thick)
6 cc piston (2 valve relief)
3.2 cc deck height (0.015" piston below deck)

(727+63+8.5+6+3.2)/(63+8.5+6+3.2)= (727 + 80.7)/80.7 = 10.0

you need to get the exact piston volume from the piston specs and measure the deck height (with a piston installed). Would also be a good idea to verify (measure) the head volume.
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Old 06-06-2011, 10:20 AM
How fast is fast enough?
 
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I would go with a .040" quench distance- it'll help all the way around. And a slightly larger cam with a 2500-3000 stall. Something around 220 duration with a relatively wide lsa- 112 or so will make for a good cruising setup, a tighter lsa and a little less duration will be better down low but require optimal tuning and 93 octane.
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