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#1 |
Registered User
Join Date: Aug 2015
Location: WATERTOWN SD
Posts: 2
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okay big block guys,i got some questions for you
hey all,
picked up a 454 from a guy real cheap and trying to decide what to do with it and need some guidance, ive built small blocks but never gotten into a big block at all so here it is 77 454 out or a motor home, has 781 heads, dont know much more since i haveant pulled it apart yet im planning on putting this in and s10 pickup just to make a mean little street truck, i know want to stick with a stock rotating assembly but i want to bump up the compression while being able to run say 91 (since that is the highest i can get around here), ive read that flat tops and 781 heads only gets you to about 8.5:1.... so how big of a dome would i want to go to get maybe 9.5:1 or maybe 10:1? Everyone says to go bigger valves with the 781s, but is it really necessary if im trying to get say 450 hp? maybe just a good port and polish? or just freshen them up and run em? i also heard a comp xe274h cam works good with a set up like this? i would like to keep it a flat tappet cam... if possible, Thanks in advance guys!! ![]() |
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#2 |
Registered User
Join Date: Feb 2015
Location: San Diego, CA
Posts: 409
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Re: okay big block guys,i got some questions for you
Check out Chevelle tech. Lots of 781 headed beast making serious torque and hp on 10:1 pump gas friendly. Best of luck
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At my worst I'm at my best |
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#3 |
Registered User
![]() Join Date: Jun 2006
Location: Maple Valley, WA
Posts: 1,913
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Re: okay big block guys,i got some questions for you
I wouldn't bother building such a low hp engine like that for an S10. You would be better off doing a small block instead. Just based on the weight factor of an iron headed BBC, if you prefer a carb type setup stuff a 6.0L lsx engine in it with a 750 and you pretty much will get what your after besides the weight savings.
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Custom Painter/Restoration Specialist 1965 GMC 3/4 Ton LB SOLD? 1964 Chevy El Camino in full restoration 1991 Chevy S10 288K+ miles 2nd Owner SOLD 2020 RAM 1500 Warlock |
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#4 |
Registered User
Join Date: Aug 2015
Location: WATERTOWN SD
Posts: 2
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Re: okay big block guys,i got some questions for you
BigDan3131 i get what your saying, but its just more the fun of it, and i figure its easy to get that power out of a big block than stick a bunch into a small block, everything else is easy to fab up and stick into the truck
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#5 |
My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
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Re: okay big block guys,i got some questions for you
I tend to agree with Dan. Probably hard to sway you if you already have the BBC. It will make the truck super nose heavy and serious fitment issues. BBC like that are more easy torque than easy HP. All depends on your pocket book. Man what you could do with a 350ish motor that pulls to 7K. If you've every been in a mini truck like that that never hooks up because of the weight spread and HP......it gets old fast.
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#6 | |||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,938
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Re: okay big block guys,i got some questions for you
Quote:
![]() SBC = less weight up front... S10 = EZPZ burnouts (no weight out back... so no need for BBC) SBC + S10 = A lot of fun for way cheaper! I know the coolness factor of a BBC is appealing... but I lean towards a SBC... ![]() Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#7 |
Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,455
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Re: okay big block guys,i got some questions for you
I love it when everyone says big blocks are so expensive to rebuild. Yes there more than a small block, but everyone does/done that. No one seems to do big blocks anymore. I have about $3k into my 454 in my car. Nothing crazy, pretty much what OP has. I can't remember what pistons I used. Think they have .133" dome, so with the 781 about 10:1 compression. My motor makes about 375, and hauls some serious ass. Car weighs aboot 3200 I'm guessing. A very, very competent engine builder told me that you could put a flower pot in a cylinder of a big block and still make power. And yes a big block weighs more than a small block, but put an aluminum intake and water pump and it will lighten it some. If your building a street truck, put the battery in the bed to help lighten it. Also do a google for big block S-10, it's doable but quite a bit of work.
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
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#8 |
My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
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Re: okay big block guys,i got some questions for you
I don't know if I'd go quite that far! As a matter of fact, I don't think I'd own one of these trucks without a BBC. Keep in mind that I am poor.
![]() pdeville......as so many times, you pocketbook will dictate a lot of what you are asking for. Personally, I don't think I would build another flat tappet motor. I have bought a couple of sets of used retro roller lifters and roller tip rockers and had fantastic luck. It's one area I won't skimp on. |
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#9 |
Registered User
![]() Join Date: Feb 2007
Location: Star Valley, WY
Posts: 2,038
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Re: okay big block guys,i got some questions for you
Welcome to the forum pdevil96. And welcome back prosteetc10.
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Steve 1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's |
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#10 | |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: okay big block guys,i got some questions for you
Quote:
I love BBC engines, everybody's got SBC and LS engines. Mine stands out in the crowd even though there are those others faster.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#11 |
Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,455
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Re: okay big block guys,i got some questions for you
I think I forgot to mention it cost bout $3k to build my motor. This included all machining, cleaning, blah blah, balancing and assembly. Done SB, can't beat the torque/power of a big block. Honestly don't have much experience with LS, but slap a hair dryer on it, and whole new ball game....big block or go home!!!!!!
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
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#12 |
Registered User
![]() Join Date: Jun 2006
Location: Maple Valley, WA
Posts: 1,913
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Re: okay big block guys,i got some questions for you
Remember though he wants to put it in an S10 not a full sized car or truck. I'm building a BBC right now for my 65 and tons of us have them but in bigger vehicles. Even just adding the aluminum headed engine there will still be a 500 pound weight difference front to rear. To help me with that I plan to build a 32 gallon tank add two batteries and a 4"x6" bumper made from .250 wall steel to help offset the difference.
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Custom Painter/Restoration Specialist 1965 GMC 3/4 Ton LB SOLD? 1964 Chevy El Camino in full restoration 1991 Chevy S10 288K+ miles 2nd Owner SOLD 2020 RAM 1500 Warlock |
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#13 |
Registered User
Join Date: Feb 2015
Location: San Diego, CA
Posts: 409
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Re: okay big block guys,i got some questions for you
My brother did a sbc s-10. Fiberglass front end and about 400hp. That thing was a beast
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At my worst I'm at my best |
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bbc, build, engine, heads, s10 |
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