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#1 |
Registered User
Join Date: Nov 2010
Location: St Agatha,ME
Posts: 28
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454 BBC engine build
truck: 81 2wd stepside
engine: 454 out of 78 suburban. did a tear down everything looked normal, nothing crazy i'm curious as to how to figure out home much compression i'd be running if/when I decide to go with this rotating assembly http://www.summitracing.com/parts/sc...05bi/overview/ with these heads http://www.ebay.com/itm/230838635537...537%26_rdc%3D1 i'm thinking thats going to be way to high of a CR to run on pump gas (91/93) If its too high i was thinking about going with this set up for a RA http://www.summitracing.com/parts/sc...05bi/overview/
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#2 |
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Join Date: Nov 2010
Location: St Agatha,ME
Posts: 28
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Re: 454 BBC engine build
in case anyone would wonder what i was going to run for a cam
http://www.summitracing.com/parts/cca-sk11-208-3
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#3 |
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Join Date: Aug 2015
Location: austin, tx
Posts: 173
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Re: 454 BBC engine build
I went with flat tops on mine. I had a little work done to my 781 heads and zero decked the block. We ended up at 9.4:1.
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#4 |
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Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: 454 BBC engine build
You should be ok on 91 pump gas but that cam is going to be really mild in a 489. I wouldn't waste the money on aftermarket heads with such a mild build. Find some 049 or 781 heads and run some 2.19/1.88 valves with a little bowl work and be done. I'd also go with a little more camshaft, roller if possible and look for something g with at least a 10-12 degree split if using OEM style heads. Look into the voodoo line if you want a shelf cam.
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Anthony |
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#5 |
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Join Date: Aug 2015
Location: austin, tx
Posts: 173
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Re: 454 BBC engine build
I put this cam in my 489: http://m.summitracing.com/parts/lun-20110711
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#6 |
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Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: 454 BBC engine build
I don't know your exact deck height but, safe to say your CR will be in the 9.9:1 range, not a problem with aluminum heads.
I would be leary about those heads, you cannot buy ONE Brodix, AFR, Dart, etc for that price. Chinese for sure, some of the Chinese castings can be made into pretty decent heads, just Beware. You didn't say what the intended usage was but, 320cc rectangular ports are pretty big, even for a 489, especially if your focus is on low end torque. |
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#7 |
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Join Date: Aug 2015
Location: austin, tx
Posts: 173
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Re: 454 BBC engine build
I can safely say I will never buy another speed master / pro comp part ever again. I bought a serpentine kit that was a cheap knock off and poorly designed so sent it back. I also bought an oil pan and it leaked from a weld. Talk about disappointed. You get what you pay for. I looked at those heads and decided to stick with my 781s.
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#8 |
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Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: 454 BBC engine build
http://www.aeroheadracing.com/chevy.html
Scroll down and you will find some good ole GM oval ports ready to go for $895 I have bought heads from these folks before. |
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#9 |
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Join Date: Nov 2010
Location: St Agatha,ME
Posts: 28
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Re: 454 BBC engine build
Pretty much mostly street/DD but I'm looking for enough power for cruise nights and messing around.
Transmission is a T56 6 speed, rear gear is a 3.73 with a 30 inch tall rear tire.
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#10 | |
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Join Date: May 2005
Location: Mobile, Al
Posts: 92
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Re: 454 BBC engine build
Quote:
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John '91 Blazer, full top, bbc, 4spd, Doubler, 1 tons, 40's |
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#11 | |
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Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: 454 BBC engine build
Quote:
http://www.speedwaymotors.com/Clay-S...454,80449.html
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#12 |
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Join Date: Feb 2010
Location: Airdrie AB
Posts: 55
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Re: 454 BBC engine build
Stick with that first rotating assembly but ditch those heads and that cam is way too small for a stroker big block. As others have said and I built my 496 the same way. 781 heads and a cam similar to the one Funkatation recommended. Mine is a touch bigger not by a lot and its a real power house of an engine.
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#13 |
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Join Date: Nov 2010
Location: St Agatha,ME
Posts: 28
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Re: 454 BBC engine build
I wasn't PLANNING on doing a mild build. checked out aerohead website with a friend (who also has a 489) and after the negative reviews i've seen here and from other sources. Scrapped the idea of those aluminum procomps, and go with a build iron set from them. Change the cam to http://www.summitracing.com/parts/cc...make/chevrolet for a little more lift.
New to the big block world... obviously
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#14 | |
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Join Date: Oct 2003
Location: Carmichael, California
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Re: 454 BBC engine build
Quote:
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Anthony |
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#15 |
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Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: 454 BBC engine build
My advise would be to forget about running a flat tappet. Save your money, do whatever you have to do to spend the extra coin and go hydraulic roller, yeah, its going to cost you a bunch more but, do it once and forget about it.
This is a proven winner in big blocks with GM oval ports: http://www.claysmithcams.com/bbc-454...x-of-5700-rpm/ |
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#16 |
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Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: 454 BBC engine build
I'll second the Voodoo grinds from Lunati. Howard was behind the design of those cams and they work fantastic.
However, I'd wait until you know exactly where your compression is going to be before I made any camshaft selections. Lobe sep and duration are going to play a huge roll with compression and how the engine is going to respond. Sounds like you'll be hitting a machine shop, and hopefully a good one. Any good shop should be able to calculate where your compression is going to fall. (don't rely on what a rotating assembly says, that's a ball park) Cylinder heads vary on chamber sizes, deck heights, piston pin heights, will all change compression. From there a good shop that specs a lot of custom grinds can taylor the camshaft that would work best for the combo, rather than an off the shelf cam. I only use "shelf" cams about 10% of the time. I prefer rollers nowadays as well, but still build flat tappets in certain cars for various reasons. |
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#17 | |
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Join Date: Oct 2003
Location: Carmichael, California
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Re: 454 BBC engine build
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Anthony |
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#18 |
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Join Date: Oct 2009
Location: Prescott, Arizona
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Re: 454 BBC engine build
Harold is what I meant, sorry, I called him Howard all the time
![]() Compression is just as important if not more so than rpm range, and just as much as cylinder head selection. "Correct" rpm range is somewhat subjective, and a grey area considering so many variables. If this guy wants to run pump gas I'd be more concerned with the intake valve events and LSA so as to work well with the compression ratio they are shooting for. It's a fine line, and usually something that an off the shelf cam with modern lobes doesn't favor as much. Too much one way or the other with a cam that doesn't like it is either going to make a pooch of an engine or one that is so sensitive to gas you're going to hate driving it. For example, with an iron head on pump gas, and considering he's running a stick shift, I wouldn't want a 109 lsa. Last edited by Firebirdjones; 01-27-2016 at 09:43 AM. |
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#19 | |
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Join Date: Oct 2003
Location: Carmichael, California
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Re: 454 BBC engine build
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Anthony |
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#20 |
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Join Date: Oct 2009
Location: Prescott, Arizona
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Re: 454 BBC engine build
Um....okay
![]() The whole point I'm making, is to taylor the compression and cam together so it makes cylinder pressure at the right time without creating a serious detonation issue on pump gas. All your experienced and high end engine builders pay close attention to this. But if that's not important to you..... If you create a rattle trap with too much compression for a given intake valve event creating more cylinder pressure down low, retarding the cam may or may not help the issue, and in every case I've seen on the dyno, retarding the cam does nothing but hurt power across the board. Engine becomes a pooch. I see people back themselves into this corner quite often. Especially out West here where we only have 91 octane. |
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#21 | |
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Join Date: Oct 2003
Location: Carmichael, California
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Re: 454 BBC engine build
Quote:
Tell me something, what is the camshft doing on the compression stroke?
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#22 |
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Join Date: Nov 2010
Location: St Agatha,ME
Posts: 28
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Re: 454 BBC engine build
It's going to a well respected and reputable machine shop in my area. Which I'm assuming Noone knows but is pretty remote. Not many machine shops. Haven't really done any readers In a custom grind or anything. I was just originally concerned with the CR with those heads and rotating assembly set up with flats or domes. Kinda made up my mind on a flat set up. My rpm range is 2000 to aprox 6k. Im not talking about all the power between that, I'd just like to hit that 6k on the tach AFTER a year of break in. Just dont want something that completely falls on its face after 5k
I do plan on babying it the first summer.
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#23 | |
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Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: 454 BBC engine build
Quote:
As for break in, never baby it. If you use a flat tappet cam, break the camshaft in, run it around the neighborhood to make sure of no leaks and oil psi and water temp is good, going through the gears a little. Once you decide all is good, drive it how your going to drive it. The only engine I had that failed was babied. After I rebuilt it the builder who is still at the same shop after about 40yrs gave me that advice and it's never let me down since.
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