The Jalopy Journal
Discussion in 'The Hokey Ass Message Board' started by edhurl, Sep 9, 2013.
2.02 valves wont work with stock bore, but he's going .060" over, so no problem with clearances.
I have a 283 with a set of power pack heads, how can you tell if the seats have been replaced with hardened ones? Also if they in fact do have hardened seats I had thought of replacing the 1.70 intake valves with the 305 1.84, would i need to replace the exhaust valve with the 305 1.60, i believe, also? Would this be an adviseable move or not? Going to run Offenhauser 3x2 intake with 3 holley 94's, 700R4 trans and a 3.73 gear in a nine inch rear. Any cam recommendations?
Thanks in advance
I'm running a old school Duntov 30/30 with solid lifters.
Sounds great !
Anyone have advice on an intake/carb combo that would compliment the comp 268 cam and power packs???
Been looking for some in my area, they don't seem to exist, lol
305 Heads would be close, a little more potential than the 520's. Single 4 would be a lot easier to tune. I was figuring 2 390's or similar for your dual, a 650 - 700 single 4 would make about the same.
Not familiar with WI but I hit CL with 416 heads in a few different cities.
Entire 305 HO engine + 416 heads for 150 needs rebuilt.
Another 305 ho with trans runs
Another set fresh and ready to go make offer.
They are out there
Some 601 heads will yield more compression.
1.84/1.50 58cc heads, good water pump, rochester quadrajet 4 barrel,intake, and hei dist all off an 84 small block for $150
All looks very clean
Forgot to add it was a high output 305
Also found a set of 601's for $50
Sounds good !
You'll need to figure your compression ratio with either.
Detonation prevention or reduction can be done by removing potential hot spots, and keeping your quench distance tight.
Busting off the hard edges will decrease hot spots and will increase the CCs of the combustion chambers, the 601s will let you do more of that before you loose compression.
You can also go lumpier on your cam choice, raise Rpms move power band up and bleed of some cylinder pressure.
Anyone want some 520 power packs?
If you're replacing the valves, you should skip the 1.84's and go to 1.94's. Same price, and better breathing. I'd go to 1.60 on the exhaust too.
So long as they're not cracked....305 heads were big on that.
I've got a 283 .030 over,power pak heads(hardened seats),weiand w/600 holley,comp 262.Nice little street motor.
So, what am I actually gaining from the 601's or 416's compared to the power packs? Is it worth buying them and still having to do the valve job and spring upgrades?
So I ran across a qaudrajet carb and intake for $70, they any good after a rebuild? I've read both negative and positive...
Well you'll have to do springs anyway.
But you'll get hard exhaust valve seats.
Near perfect velocity
Also some accessory holes you might not want.
They learned a lot in those 20 years between manufacturing dates.
Then secondary you can utilize- if you wish
A bigger cam, higer revving, higher power band, looser converter, numberically higher gears.
They are great heads for the smaller bore engines, and cheap too. the 4"+bore engines guys will fall on their face on the top end with them. It's all about flow and velocity. No flow and its out of breath- no velocity and there's no power.
Nothing wrong with Quadrajets; a very versatile carburetor. However, they made them for over 30 years and some of them won't do you any good. There should be an I.D. number stamped on the driver side about 2/3 of the way back, vertically, unless it's very early ('65-'67), in which case it will have a round dime sized tag pressed into the driver side of the main body.
What am I looking to avoid? He has a few of them he said , including one he took off a running impala
The latest Electronic versions of the QJet.
Look for late 70s - 1980, after 80 most will be electronic.
My favorite is the 260h by Comp cams.
Hoop98 Im building another 283 along the same lines as this and was wondering if you would mind running one more cam for this comparison.
Dur.@ .050 256/264
Here you go, as ground ICL 99 LSA 105, with 305 heads
Would it change head and cam choice if I bore to 4"? That's only if the machinest says I have enough wall....
Yea, quite a bit.
You'll have a 301 and should follow proven 301 recipes.
You could go with Patriot 2168 -about 800 assembled ready to run or the ever popular Vortecs. You will need to figure pistons to get the right compression. here is the XE274 with stock vortecs
Maybe up one notch on cam, starting to get pretty far from the original idea.
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