First Generation Firebird-L Mailing List .........................................................................
Thanx for reply Pete, The carb is a mid 70's 850 cfm Carter Thermo Quad (aka thermo bog) commonly found on chrysler cars of the day. Not sure who put it on there, but I haven't heard of them being on these Pontiacs. I have played with the secondaries a bit and seems like I have optimized them all I can. There is the typical pause when I put my foot in it (lean) then it goes good. I have optimized the accelerator pump to max squirt and travel when I hit it. But it is a single pumper so the little pause I believe is normal. I am not shooting for 11:1, I'd prefer to make big power at 8:1, but all the big power from these 455's in 1970 were at 10.5:1 at around 87cc. I was just saying that 11:1 should be OK with our 92 octane gas and maybe a little octane boost (about $6 per tank). So if I could remove some material and port a set of 72cc 62's or 16's and use a little thicker head gasket, would it be streetable at 11:1 on a 455? > Date: Sat, 19 Dec 2009 10:17:46 -0800 > From: [email protected] > Subject: Re: [FGF] Hello and head question. > To: [email protected] > > First Generation Firebird-L Mailing List > ......................................................................... > Dion, > I agree with Paul, it's not easy to compete with today's auto technology. It > all comes down to the power to weight ratio. A 375hp engine in a 4000lb car > may not perform as well as a 2700lb. car with 300hp. And, of course with more > power comes the issue of getting it to the ground - getting the car to > hook-up. I always thought it was funny to see muscle cars with little 7" > tires on them. =) I'm selective with who I race and try to keep up with what > models have what engine etc.. > In regard to your 455; I don't recall what carb you have but make sure your > secondaries are opening at the right time. And, again, if you're shooting for > 11:1, [even w/ 92 octane] your timing options will be limited. I had to run > an octane booster [which is pricey] before i pulled my 62 heads. I'm now > running ~9.5:1 and have a lot of latitude in terms of timing adjustability. > With that, I've set up a 'hop-out" timing curve which seems to work well with > heavy muscle cars. > > PeteJD > [69 400/400] > > > > ------------------------------------------------------------------------ > Submissions to Firebird-L: <[email protected]> > Unsubscribe from Firebird-L: <[email protected]> > Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> > > Classifieds: <http://FirstGenFirebird.org/ubb/> > Owner Pictures: <http://FirstGenFirebird.org/show/> > > _________________________________________________________________ Eligible CDN College & University students can upgrade to Windows 7 before Jan 3 for only $39.99. Upgrade now! http://go.microsoft.com/?linkid=9691819 ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[email protected]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/>
