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#1 |
Registered User
Join Date: Jan 2004
Location: Walker,louisiana
Posts: 179
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hp? on rebuilding a 350
i have a 350 4 bolt with 80000 miles on it it runs great no smoke . it is out of the truck and going to get freshed up what would i need to do to get 400hp out of it . should i buy new heads or have mine redone . any info would be great thanks all
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(If all else fails get a bigger hammer) |
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#2 | |
Registered User
Join Date: Feb 2006
Location: northridge
Posts: 534
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Re: hp? on rebuilding a 350
Quote:
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""A bagged vehicle is only as good as it's wheel/tire combo!" -getlowness! my build thread http://67-72chevytrucks.com/vboard/s...=223747:metal: I'M SO SO CAL! ![]() Last edited by 69face; 05-16-2006 at 06:05 PM. |
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#3 |
Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
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Re: hp? on rebuilding a 350
I don't feel that 400 HP would require a complete aftermarket high $ bottom end I have seen 2 bolt mains with stock rods cast cranks hold up just fine at that level of HP. I built an older cast 2 bolt using a cast crank stock rods with stud kits on the mains and rods trickflow heads a heafty solid cam single plane intake holley 750 the heads were unported and used I just matched the valve springs to the cam the compression was a conservative 9:8.1 so it ran on premium fuel. Never dynoed it but it was a easy 400+HP engine. Built it in 98 and it is still running in a friend of mines S-10 and he runs it hard.
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
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#4 |
Happy Camper
Join Date: Feb 2006
Location: Northern California
Posts: 8,408
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Re: hp? on rebuilding a 350
400 hp S10, that must be a fun one!
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RIP El Jay! Love you brother! |
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#5 | |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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Re: hp? on rebuilding a 350
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#6 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: hp? on rebuilding a 350
The bottom end really won't make you any horsepower. It will just make it live longer. Upping the compression will though.
It's going to be about heads, intake, carb, and cam....getting the air in and out. Also, before you get carried away with hitting 400HP, think about how you drive and what you want out of it. Cause if it hits 400HP at 7000RPMs but is only making a peak torque of 300 at 4500rpms or so, you may be severely disapointed. If you choose the right components and hit 350HP at 5500 RPMS and are making 400ft lbs of torque at 2000 rpms, you would probably be A LOT happier. Peak horsepower numbers aren't the whole story. Good luck. |
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#7 | |
Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
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Re: hp? on rebuilding a 350
Quote:
Now that is a good one I'll have to remember that. No dyno tests But I have time slips =it is an S-10 Blazer and it weighs about 3400# and it ran a 11.8@115 at Bandimere speedway
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
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#8 |
Registered User
Join Date: Oct 2005
Location: Northern Arkansas
Posts: 1,136
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Re: hp? on rebuilding a 350
Your stock crank,rods,and related hardware are easily good to 400hp. If you want seat of the pants feel git-up-&-go build for torque and the horsepower will fall in line on it's own. Match everything up well, and you'll be pleased. I would say for 400 hp and 425+ ft. lbs. torque you'll need hyperuetectic flat-top pistons,bore matched, 64cc heads with 170cc intake runners and 2.02, 1.60 valves, with bowl cleanup and port matching, a cam with around .520 lift and 230 degrees duration, a high-rise intake, full roller rockers, 650-700cfm carb, a performance ignition system, good headers and free flowing exhaust. Oh yeah, and about $3500, if you put it together yourself.
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#9 |
Registered User
Join Date: Jan 2004
Location: Walker,louisiana
Posts: 179
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Re: hp? on rebuilding a 350
thanks everyone what do you think about 350 /.30 over block stock rods 292 comp cam / arf cast heads 200cc 202 / 160 valves / 64cc/ edelbrock torker 2 intake / holley 750 double pump mech. sec carb . with this set up what pistons should i run i want about 10.1 comp thanks for all the help
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#10 |
Registered User
![]() Join Date: Aug 2005
Location: Philly
Posts: 1,140
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Re: hp? on rebuilding a 350
What are you using the truck for? If you want a street truck, ditch the torker intake.
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#11 |
Registered User
Join Date: Jan 2004
Location: Walker,louisiana
Posts: 179
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Re: hp? on rebuilding a 350
what intake to use it matches the cam thats why i was going to use it thanks
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#12 |
Registered User
![]() Join Date: Jan 2005
Location: Eastern Nebraska
Posts: 611
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Re: hp? on rebuilding a 350
With all the $$$ you may have to put into that engine, you might be better off with one of these: (but some guys just love building their own...I do that with computers...not good enough with engines just yet)
HT383 Performance Crate Engine 12499101 Specially tuned for torque. The all new HT 383 delivers great truck power in a small block package for your truck or street rod. With its 3.80" stroke and Vortec cylinder heads the HT 383 makes awesome torque, down low where you need it for towing or four wheeling off road. Peak torque is 435 ft.lbs at 4000 rpm, but the HT 383 makes over 400 ft.lbs. from 2500 to 4000 rpm. Developed with a roller cam, special heavy duty forged powdered metal connecting rods, "4340" forged crankshaft and hypereutectic pistons the HT 383 is designed ot be worked. 340 horsepower at 4500 rpm doesn't hurt either. The HT 383 is an ideal replacement for any 1977 and older carbureted engine or off road application. ZZ4 Crate Engine 350CI 355HP HO with Aluminum Heads 24502609 Imagine an aluminum head small block that makes 355 horsepower. What if it had a steel roller camshaft, four bolt main block, undercut rolled fillet crankshaft, high silicon pistons and strong PM connecting rods? We imagined it, and then engineered, developed, tested and built it. The ZZ4 is the evolution of our popular ZZ series of small blocks that power thousands of street rods, hot street cars, circle track racers and drag racers. With over 400 ft.lbs. of torque, the ZZ4 is the best way to put an aluminum head, roller cam, high performance small block between your favorite fenders. The aluminum angle plug cylinder heads have screw in rocker studs, 1.94" intake and 1.50" exhaust valves and 58cc combustion chambers that yield a crisp and responsive 10 to 1 compression ratio. Also included are our lightweight valve spring retainers that weigh half as much as our previous design. The valve seats are radiused and we've included valve stem seals to help keep the oil where it belongs. To compliment the cylinder head design, we've incorporated a steel roller tappet camshaft with .474" intake and .510" exhaust valve lift. The combination makes 355 horsepower at 5250 rpm and has that great sounding muscle car idle, with just enough lope to let people know that this is no station wagon engine.
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'72 Chevy K-20 Crate 350, SM465, 4.10's |
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#13 | |
Senior Member
Join Date: Nov 2005
Location: northwestern wi
Posts: 2,111
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Re: hp? on rebuilding a 350
Quote:
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common sense isn't so common anymore |
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#14 |
Registered User
Join Date: May 2006
Location: Colorado
Posts: 412
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Re: hp? on rebuilding a 350
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#15 |
Registered User
Join Date: Apr 2006
Location: calif
Posts: 64
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Re: hp? on rebuilding a 350
Hot rod mag does a budget build 383 strocker.under 1000$ and it made 400hp 441 torqe. it tells u step by step, they tried differnt cams heads intakes and carbs. thats what i am following on my build.
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#16 |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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Re: hp? on rebuilding a 350
You Drive Torque, & Sell Horsepower.
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#17 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: hp? on rebuilding a 350
daubs, you left out the fast burn 385.
I think for a street truck the torque will seem like a better deal both by feel and for the $$$. The torque is what starts the truck rolling.The HP will push you down the track but only after the torque gets you moving.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#18 | |
Registered User
Join Date: Feb 2006
Location: northridge
Posts: 534
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Re: hp? on rebuilding a 350
Quote:
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""A bagged vehicle is only as good as it's wheel/tire combo!" -getlowness! my build thread http://67-72chevytrucks.com/vboard/s...=223747:metal: I'M SO SO CAL! ![]() |
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#19 | |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: hp? on rebuilding a 350
Quote:
Last edited by JAKES 68GMC; 05-18-2006 at 09:37 PM. |
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#20 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: hp? on rebuilding a 350
Quote:
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#21 |
Active Member
![]() Join Date: Dec 2002
Location: West TN (Memphis area) now. East TN (my favorite place to live).
Posts: 157
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Re: hp? on rebuilding a 350
Forged pistons + forged rods + nitrous = 400hp.
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BigFredTN 70 chevy stepside 350 with some goodies inside, turbo 400. 69 Chevy long wheel base. Dad bought new in 1970 62 Chevy Impala 98 GMC Yukon 1970 Ford Mustang Fastback I know its a Ford. |
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#22 |
Registered User
Join Date: May 2005
Location: South Mississippi
Posts: 81
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Re: hp? on rebuilding a 350
All steel truck equals heavy, to get heavy movin means TORQUE. I was tryin to give you a hyperlink but I don,t have , wait I got it---http://www.ryanscarpage.50megs.com/combos1.html Anyway we can all talk HP/ Torque but dynos don't tell stories. Look thru all the combos find what you need. BUT be sure what you want the truck to do. A 69 hittin 7 grand on the street to get the HP is silly, you won't be able to haul a canoe in the back, with a cooler of beer. My 2 cents is build the torque the HP will follow. Steve
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1969 C10 Long Step,355,700r4w/lockup, HEI,Weiand,750 Performer,1.6 rockers,Camel Humps,Comp 262Extreme,Hedman,2 1/2"pipes, tele/tilt,SunRoof,ps,Disc pb,ac,Cragar,eaton,Corvette style roll pan, Bowtie louvered tail gate,lowered 2/2. |
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#23 |
Registered User
Join Date: Nov 2005
Location: WV
Posts: 227
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Re: hp? on rebuilding a 350
If you are buying a new crank go with the 383 it is almost the same price so its like getting 33 free cid.
Shane
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1993 K1500 350 5 speed ![]() 1985 K10 Silverado Vortec 406 5 speed (in body shop) "I been drivin' this '85 pickup truck Them buddies of mine call it a bucket of rust She's a little beat up but she still runs like the wind Yeah, kinda like me I been banged and bruisedBeen around the block a time or two But I'm runnin' like new goin' places I never been No, I ain't broke I'm just broken in" 1963 Dodge Townwagon(its amazng what 30 years and zero miles will do to a vehicle ![]() Member#20327 |
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