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First big block build

 
393stroker
I love my Chevy Chevette!
Posts: 6
Joined: 07/13
Posted: 07/20/13 06:57 PM

Hi, I`m building my first big block chevy. It`s a MarkIV 454 stroked out to 496 w/026 rec. port iron heads w/2.3 int. valves, full port/polish. Comp Gold rocker arms w/stud girdle It has 10.6:1 pistons and a Lunati solid flat tappet cam w/.610,.625 lift. Eld. airgap intake and AED Holley 990cfm. I put a Comp. belt drive on it too. I got a Meziere clockable starter to clear the Canton pan and Hooker supercomp headers and 55gpm elec. waterpump. I know very little about Chevy`s,first one. I was wondering if I should have went w/belt driven water pump and how much HP I should be looking to get out of it. Does anyone have a similar build?  

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 07/21/13 08:35 AM

I have built a few BBs in my time. One was similar to yours except it had a little higher compression, 12.5, and a tunnel ram with 2 660s. It made 526 at the rear wheels which converts to about 700 @ the flywheel considering a 30% drive train loss due to heavy drive train components and a loose converter in the 4500-5000 range. I would estimate yours in the 600-625 range. A full roller would get you roughly another 20-30hp. I ran electric water pumps all the time with good results but I was strictly drag racing. They are great for cool down between rounds. They are also worth a few hp. Electric fans are another HP saver. Only if you are having cooling problems would I consider switching back to a belt driven fan. If your radiator is big enough I don't think you will have trouble.  
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393stroker
I love my Chevy Chevette!
Posts: 6
Joined: 07/13
Posted: 07/21/13 12:08 PM

Dave, thanks for the reply. I have the Flex-a-lite dual fan set-up that should be good to go. I`ve been working on it for 1 year and trying to do it right. It`s going in my `73 Firebird w/4 speed. But now I find that the tall valve covers won`t clear the brake booster. Do you know where to get a smaller one that will work?  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 07/21/13 12:32 PM

You could convert to hydro-boost and get more clearance and not have to worry about vacuum controlled brakes.  
68scott385 68scott385 68scott385

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393stroker
I love my Chevy Chevette!
Posts: 6
Joined: 07/13
Posted: 07/21/13 03:01 PM

Thanks Scott, I`ll see what I can find on hydro-boosters.  

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393stroker
I love my Chevy Chevette!
Posts: 6
Joined: 07/13
Posted: 07/21/13 04:53 PM

Smirk I found this company called Hydratech, I think I`ll give them a call. Thanks again.  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 07/21/13 06:09 PM

I think Art Carr sells a kit but most of the stuff can be had from a salvage yard for lunch money.

Here's a how-to from another forum.

http://bangshift.com/blog/tech-how-to-swap-a-junkyard-hyrdoboost-on-your-classic-gm-muscle-car-or-truck.html  
68scott385 68scott385 68scott385

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 07/22/13 12:51 PM

I had a lot of trouble with Hydro boost on my Chevy dually. Real tough to get the air out of the system. At least it was for me.  
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]

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393stroker
I love my Chevy Chevette!
Posts: 6
Joined: 07/13
Posted: 07/22/13 06:08 PM

http://www.hydratechbraking.com/GM_2ndgenF_Body.html This place has one that will fit `70s Firebirds/Camaro`s. I bought the March pulley kit to use w/elec. water pump, and their power steering pump, so I`ll have to T in the return lines. Guys, thanks for the info, I was concerned there for a minute. I think this build is going to turn out pretty good.  

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