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fastnloud 12-27-2012 06:48 PM

SBC Questions
 
I have an 82 GMC Sierra with a built 350 and 350 turbo trans. Street driven.

Here are the specs on my motor:

350 4 Bolt Main .040 Over
Scat forged I beam rods
Keith Black flat top pistons 4v reliefs
Moly rings
World Sportsman II heads 2.02 valves and 64cc chambers
Edelbrock performer rpm intake
Edelbrock 650 carb
1 7/8 longtube headers
Lunati Bracket Master II Cam 300 duration
Crane Valve springs
Crane roller rockers
Comp Cams double roller timing set


Trans:
350 turbo
b&m rebuild kit
stage 2 shift kit
Hughes Performance 3000 stall

I haven't dynoed it, but the truck runs very well!

My questions are... what would I need to add/change out to make my motor a 383 stroker? How much more horsepower would I be looking at?

Also, would a tunnel ram intake make very much more horsepower or torque?

Thanks guys.

496CHEVY3100 12-27-2012 07:27 PM

Not much gain in horsepower ,but Big gain in torque , Horsepower sells motors TORQUE wins races

fastnloud 12-27-2012 07:32 PM

Thanks for the help.

I have 3:73 rear gears in my truck, it has some good low end pep, and turns about 2800-3000 rpm at cruising speeds of around 55-60 mph.

What type of bigger intake would you recommend?

fastnloud 12-27-2012 07:34 PM

Quote:

Originally Posted by 496CHEVY3100 (Post 1627734)
Not much gain in horsepower ,but Big gain in torque , Horsepower sells motors TORQUE wins races

Indeed, thanks.

fastnloud 12-27-2012 07:37 PM

Can you guys make an estimate on what compression my motor has with the specs I have listed?

496CHEVY3100 12-27-2012 08:05 PM

Without knowing compression thickness of head gasket ?41 mabe,tulip valves or flat,tapered top on pistpns or flat all the way to edge ,how thick are top ring lands,rod length,has block ben decked ,does it have 3.48 stroke or stroker notice bore .040 will raise slightly ,if all fairly close to standard approx 9.75

fastnloud 12-27-2012 08:07 PM

Quote:

Originally Posted by 496CHEVY3100 (Post 1627755)
Without knowing compression thickness of head gasket ?41 mabe,tulip valves or flat,tapered top on pistpns or flat all the way to edge ,how thick are top ring lands,rod length,has block ben decked ,does it have 3.48 stroke or stroker notice bore .040 will raise slightly ,if all fairly close to standard approx 9.75

Alright, thanks.

fastnloud 12-27-2012 08:24 PM

Thanks, yeah it's a street truck only, and I do drive it in cold weather as well. Low end torque/power is most important to me.

vinniekq2 12-27-2012 09:08 PM

where did you get 1 7/8 headers? what kind of adapters are you using? I would use 1 3/4 headers for a hot truck engine. are the sportsman heads ported?

fastnloud 12-27-2012 09:15 PM

Quote:

Originally Posted by vinniekq2 (Post 1627782)
where did you get 1 7/8 headers? what kind of adapters are you using? I would use 1 3/4 headers for a hot truck engine. are the sportsman heads ported?

I bought the truck with them on there. They are suppose to be hooker super comp long tubes. I'm kinda looking around for some headers on the used market right now, that I want to paint black, so I'll keep in mind the 1 3/4 recommendation.

Also, I'm not sure on whether the heads are ported or not. I'm guessing the sportsman heads don't come from the factory ported, right?

vinniekq2 12-27-2012 09:33 PM

The sportsman heads can be nicely ported. Local here used those heads for quite a few years before upgrading to vic jrs. The car (67 Camaro) dipped into the 10s a few years ago with a 355.He then build a replacement 383 with victor heads.
The sportmans when ported flowed 265 CFM.
The headers you have should have a 7 bolt flange if they are 1 7/8 tubes. Those are big tubes...If they are hooker headers,make sure you buy the hooker pattern for the inside gasket if you replace gaskets

496CHEVY3100 12-27-2012 10:20 PM

Opinnions are like ? well everone has one ,Heres mine if i were going to do the majorty street driving ,I would used 1 5/8 for low & mediun rpm range 1000-5200 with a 355 leave big tube headers for high rpm and 406 -and 434 guys and light weight vehicles ,more tpurque where you will be operating, I run 1-3/4 on my big block 496 in picture above it is in a 1953 chevy p/u Very happy with results

vinniekq2 12-27-2012 10:36 PM

I can see using 1 3/4 inch header primaries on a 396,sounds like a good choice.
small block headers I see 1 1/2 inch primaries as a good choice for near stock applications. good point above

496CHEVY3100 12-27-2012 10:58 PM

its a 496 a 454 .030 over .250 over stroke i have 113 cc aluminum heads not in picture 9-5 compression acomp 288 cam roller rockers comp roller chain pushrods 100 longer and 3- 500 cfm holleys sanderson headers 400 turbo 331 gears ,just a good ole farm truck

fastnloud 12-28-2012 06:11 PM

Yeah, the headers were on the truck when I bought it, but If i ever change them out I'll keep these suggestions in mind. Do different tube diameters on long tube headers make big differences in the sound of the truck?

Do you guys think I would gain much on the street by going up to a 750 carb?


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