I talk to some one that had a set of 305 HO heads. I was wondering how would they work on my 307 in my 69 malibu. I also asked about the LT1 ealier.

the HO heads would work pretty well.

A good set of heads transforms the 307 into a stroked 283 instead of a grocery getter. Make sure the heads are truly the HO ones and that they have the small cumbustion chamber. Along with a well matched cam grind it should come alive.

Steve

hollingshedlr

Got a name like Jim or Greg?

Your 69 307/200 horse engine probably has the #185 heads, 69.625 nominal chamber volume, 1.72/1.50" valves

#416 is one of several 'good guy' 305HO casting numbers with the small chamber and old style perimeter valve cover bolts vs newer center style. The 416s have the larger 1.84 intake, same 1.50" exhaust. 58cc nominal chamber volume. This will bump your nominal 9:1 CR up to 10:1--10.2:1 so be sure to run a larger than stock cam, actually quite a bit larger, or your cyl pressure will be too high leading to detonation. Ensure you get matching springs for your cam. I do suppose the Chevy bargain Z-28 valve springs should handle just about any cam you put in that 307. edit: If he asks for more than a few bucks for the 305HO heads...walk away. They are just about dime-a dozen. People will GIVE you early 80s 305 take-out engines to clear their yard or shop
I wouldn't give over $50 for a pair off a known running engine!

Back in the day, around 1980, I scrapped my 68 307 2v heads, went to some 461 heads with 62cc chambers and ran a Isky 201270 .445/.445" 216/216* dur@.050 on 108 LSA. In my 68 Nova, 10" converter and 4.56 it was very very quick considering only 312 cubes.

That ol rascal Paul "pdq67," who used 283s as pacifiers, should be able to assist with your Mouse cam selection.

I have a 71 Nova that I bought a couple years ago and my son and I just pulled the motor out of it aobut 6 months ago to do some engine bay detailing and to refresh the motor a bit so we could start showing it and just cruiseing it around again. I always just thought the car had a 350 in it because it ran really strong. Boy was I wrong. Once we got it out and got all the dirt and grease pressure washed off. I ran the numbers and it was the correct numbers matching original 307. We really got to looking at it and dissassembled it and what did we find. It had some small valve camel hump heads that have had some port and other work done to them it had been bored .030 with some flat top two valve relief pistons. It also had one of the 327 grind chevy cams in it. we checked everything out and as it had very low time on it we put new rings and bearings in it and put it back together. We installed an Isky 264 Mega cam in it with new lifters and pushrods. A new set of harlin sharp roller rockers. Topped it off with an edelbrock performer RPM and a 600 cfm edelbrock carb. It has hooker comp headers and 2.5 inch flowmaster exhaust. We run a 2500 stall hughes converter and a B&M turbo 350 transmission. The rear is an 8.5 10 bold with 3.42 gearing with a factory posi. Man this car is very fun and runs very good and strong. We are going to go run it at the strip sometime in the next few months. I bet we will be surpised at how well it does

Rick

The heads are 416 and he is asking $150 for the set. If I was to get these Would I be able to put some bigger valve in them 1.94 on intake and 1.55 or 1.60 on the exhaust. And may be port and polish them if possible.

heh heh...good story Rick!
Not the size of the engine in the fight but the size of the fight in the engine!

hollingshedlr (with no name)
You can get a whole 305 probably for less than that. If I was desperate and needed heads for a work vehicle/something MAKING me money that I needed up...maybe! For recreational purposes...I'd keep looking...maybe $75 tops
What do you other guys reading this thread think? $50? $75? $100? Free?

Sure, you can do just about anything you want to do....1.94 etc...but you really do not need larger valves, it is a 307!
Those heads are sized for 305s so perfect.

FYI, my 70 Elky daily driver 350/th350 does have 416 heads on it. I traded for them, already equipped with 2.02/1.60" valves.
Dirt track cyl head guy says not so much improvement with these heads going to larger valves....

I'm in here!

I'd use 305HO, -601 heads that have 1.84"/1.50" valves, (AND only put 1.60" exhaust valves in them IF WANTED), after cc'ing them so I would know my CR!!

.015" to .020" thick shims too!

Get the CR. up to like 9.75 to 10 and add a 264 to a 268 cam, an old 1850, 600cfm, vacuum secondary Holley carb on their GREAT old 300-36 true high-rise dual plane intake and a cheap set of 1.625" dia., 4-tube, long headers only b/c we CAN'T buy 1.375" or 1.5" headers and GO!!

You gear and tire her right in a light to medium weight car/P/U and it WILL get up and GO!!

IMHO!!!

pdq67

I'm in here!

I'd use 305HO, -601 heads that have 1.84"/1.50" valves, (AND only put 1.60" exhaust valves in them IF WANTED), after cc'ing them so I would know my CR!!

.015" to .020" thick shims too!

Get the CR. up to like 9.75 to 10 and add a 264 to a 268 cam, an old 1850, 600cfm, vacuum secondary Holley carb on their GREAT old 300-36 true high-rise dual plane intake and a cheap set of 1.625" dia., 4-tube, long headers only b/c we CAN'T buy 1.375" or 1.5" headers and GO!!

You gear and tire her right in a light to medium weight car/P/U and it WILL get up and GO!!

IMHO!!!

pdq67

:noway: Paul, your getting older, you forgot to say run a 108° lobe seperation too with this combo, dont worry paul, My memory sucks too :D

A 307 is just a 283 cylinder bore with a 327 crank {3.25" stroke}

I built a customers 305 that ran very good, i suggested a 355, his reason was the 305 was the matching numbers engine for his car. Runs well.

i sold two sets of ho 305 heads one set on ebay and one set to someone else on the computer i shipped them both ( 601 and 416). 100 bucks per set plus shipping. pure profit they was given to me!

probably get a bunch of disagreement on this but I think that the 305 heads don't flow well enough without port work even though they will net you some added compression.

probably get a bunch of disagreement on this but I think that the 305 heads don't flow well enough without port work even though they will net you some added compression.

305 heads flow enough for a 305 so why wont they for a 307?

Have you ever seen a 305 super stock engine run high 10's low 11's in a 3400 pound car? I was shocked, i know it was a 305 because the engine builder told me, plus i know him

If the heads are small this is also why you use a larger cam

Does anyone have a link to the 343hp 9.5:1 compression 305 Lunati built? Post it if you do

I'd just as soon use some double humps if I were gonna use stock heads. I doubt that super stocker had stock 601's. I won't even get into how many 601's I've seen cracked.

A Brothers My name is Lorenzo For those who might have been wondering. I look on summit's web site and they hace a set of vortec head for $292 or some where around that price. I figure I might as well go that route this is the Part # SUM-151124 check them let me know what you think.

Vortec heads are known for good flow and high velocity, but not all of them are good. Maybe someone else can chime in with the casting numbers. Enginequest is producing new castings with ~58cc chamber and incredible flow out of the box, around 350 if I remember.

Vortec heads are known for good flow and high velocity, but not all of them are good. Maybe someone else can chime in with the casting numbers. Enginequest is producing new castings with ~58cc chamber and incredible flow out of the box, around 350 if I remember.
there are two different casting numbers for the 350 vortec heads- but they are identical.
i'm not sure about the 305 vortec heads- i've never heard of anyone trying them. i think there are also two different casting numbers that are also identical. i'd like to just take a look at a 305 vortec head side by side with a 350 vortec head. seeing as how the 96 vortec 305 had as much power and torque as the TBI 350 did in 95, they have to have something going for them.

Okay, I slapped some 305 HO heads on my 307 several years back and for $350, not much more bang can be had for the buck. They had been prepped with a 3 angle job with 1.95/1.5 valves and 58cc chambers. I love the combo. I am running a comp cams 262h grind cam for mild street. Only thing is that I have a Holley 650 with vac secondaries and I think it's too much carb still. I am thinking of going down to a 550cfm. I ran the numbers and at %100 efficiency the 307 still only pulls something around 480cfm. I think I am just wasting gas and with a 550 it will help get better mileage as well as more torque. I am also running an edelbrock rpm intake with a 1" spacer. As far as HP goes, I have no idea of what I am getting at this point. Thoughts?

Okay, I slapped some 305 HO heads on my 307 several years back and for $350, not much more bang can be had for the buck. They had been prepped with a 3 angle job with 1.95/1.5 valves and 58cc chambers. I love the combo. I am running a comp cams 262h grind cam for mild street. Only thing is that I have a Holley 650 with vac secondaries and I think it's too much carb still. I am thinking of going down to a 550cfm. I ran the numbers and at %100 efficiency the 307 still only pulls something around 480cfm. I think I am just wasting gas and with a 550 it will help get better mileage as well as more torque. I am also running an edelbrock rpm intake with a 1" spacer. As far as HP goes, I have no idea of what I am getting at this point. Thoughts?
as soon as i scrape the $$$ together, i'm gonna buy a 355 with flat top hyper pistons with a set of 305Ho heads with 1.94 valves and the same cam you've got. it's got like 11:1 or so compression and LOTS of cranking pressure- i'm thinking it will make a great E85 motor in my Monte. it moved an 80 Malibu with 2.41 gears and a TH350 around pretty good, so it should do ok in my Monte with 2.73 gears and the deep first gear of the 700r4 trans.
as for the carb you should run- can i suggest a quadrajet? those tiny little primaries will really boost the torque down low at part throttle- i think they flow 250 or so cfm by themselves- and the secondaries will open exactly as much as they need to in order to keep the motor happy at all times.

I had thought about the quadrajet, but I admit I am not all too familiar with em'. There seem to be a lot of different forms of them. Any suggestions of an exact model? I do like the idea of on demand consumption. How about something like this http://cgi.ebay.com/ebaymotors/CHEVROLET-350-5-7-REMAN-ROCHESTER-4MV-QJ-CARB-1972_W0QQcmdZViewItemQQ_trksidZp1638Q2em118Q2el124 7QQcategoryZ33550QQihZ007QQitemZ170181137390QQrdZ1 QQsspagenameZWD1V ? It looks like it is actually OEM for my 72 Malibu. I know it's a 750CFM, but if it acts like it's supposed to it will only pull what it needs, right? What kind of setup are we talking about as far as setting up linkage since it's not vac sec as well as vac hoses?

Derrick,

If you are really thinking about building a dedicated E85 engine, then CR. her up about 13.5 to 1 and be done w/ it!!

As for a Q-Jet, they ONLY suck what the engine need's so even the 800 cfm jobber will be fine on a stock 262 all the way up to a mild 454 if it is tuned right, imho!!

pdq67

q jets are easy to set up- just bolt it on, adjust the idle speed and mixture screws, adjust the choke, and dial in how fast the secondary air door opens up.. usually, when it does the famous "quadra bogggg" it's because the secondaries are opening too fast for the engine. just tighten the air door screw 1/8 turn and try it again..
i had an out of the box 850 cfm Edelbrock q jet on the stock 307 in my Nova, and it worked beautiful once i tweaked all the screws. when i built the vortec 355, i put that carb on it and adjusted everything again.. now, that carb is on the stock 350 in my 74 Monte Carlo, and again, a few twists of a few screws and it works great.
as for the vacuum line hookups- the power brakes go to the big port on the back, the PCV valve goes to the big port on the front, and the vacuum advance goes to either the of the small vacuum ports depending on if your engine likes full manifold vacuum advance or ported advance.

Derrick,

If you are really thinking about building a dedicated E85 engine, then CR. her up about 13.5 to 1 and be done w/ it!!
the motor i'm getting is already built, and the 11:1 or so compression leaves a little room for regular gas if there isn't any E85 around. it has really thick head gaskets in it now, but i've got a set of .015 steel shims hanging out in the garage that could be put in to bump the CR up a bit. i figure that the little cam holds in a ton of that cylinder pressure, so it will work fine as an E85 mill.

Derrick,

I think the E-brock GM based Q-Jets are history now!!

I don't know if they had the right's to MOPAR's 1,000 cfm T-Quad or not, but if so, it's probably dead too?????

I don't know what heads are on your engine, but how high would a pair of heads that could be from 50 to 58 cc's raise your CR. using the shims you mentioned?

I do know that 305HO, -601 heads can be as small as 52 cc's so think about this for a bit.

pdq67

I've been reading some of these threads about using 305 heads.

I'm getting ready to build a 283 for my 65 Chevelle (taking block, crank, and rods to machine shop next week).

I have access to a set of 416 and 601 heads that both have fresh valve jobs and are ready to bolt on. The 416 heads are 58cc and have been opened to 1.94 valves. The 601 heads are 53cc with the 1.84 valves.

Here is some other useful info on what I'm planning to do/use:
Summit K1102 Cam
Bore to 3.905 with cast aluminum Flat Top Pistons (Federal Mogul)
Dual plan aluminum intake (on hand)
Quadrajet (on hand)
Long tube headers
Double roller timing chain

I believe the 416's will get me a compression ration in the low 9's and the 601's should be around 10:1.

I want this to be a nice driver but also to be fun with my 4-speed and 3.31 posi.

Thoughts on which heads to use and whether 1.94 or 1.84 valves would be better?

Thanks.

Imho, the 1.84" will be fine for a 283.

Please consider this little-bitty solid lifter cam from Clevite for your 283, I figure that it will love it!

Clevite PN 229-1998;

258/219/270/229, 114/110, .456"/.479" gross lift and need's .022" lash on both sides!

I think PBM sells it??

PBM Performance Products
7301 Global Drive
Louisville, KY 40258
800-588-9608

Or check Competition Products and Powerhouse too??

pdq67

I'd run the 601 heads, the likelyhood is the cast replacement pistons will be around .045" in the hole.
Given your specs, at zero deck you'd have 9.7:1 with the 601 heads, around 9.1 with composite head gaskets and .025" negative deck, and even less if the pistons are farther in the hole.

The cam kit you've chosen is the same grind as the Edelbrock performer cam, melling MTC-1, etc. To be honest, we've tried that cam several times, used it as our "go to" RV cam in dozens of 350's and whatnot a few years ago, it is far from "awe inspiring".

I would be tempted to install Comp's XE250H cam instead. I've been very pleased with the applications that we've used the XE lines of cams, but they can be a little noisier due to the more aggressive valve action compared to stock or that Summit 1102. Combo's that were beyond impressive for what they were supposed to be:

EFI 5L ford in a 3/8 ton 4x4, XE252H, as crisp an engine we've felt in that heavy a vehicle.
289 ford, Edelbrock performer heads, 9.5:1, XE256H, mild torque converter. Incredible throttle response, blows tires off at will. (Yes they are normal radial tires)
351 Ford W, XE268, fairly light car got into the 12's.
406 Chev, XE274, heavy car, 12's.

I believe the XE250H is the perfect choice for your combo. Good torque, throttle response, and the engine should happily rev to 6000, good power to 5500.

What Doug said about the replacement pistons is why I want to buy the old 1/8" tall, 1/2-round domed, 283 FI pistons like I had in my old junk301.

I also used Mr. G's .020" thick steel shims and I figure my CR. was right around 10 to MAYBE 10,25 to 1 w/ my ground-h-ll outta '55, 265 heads. Heads w/ the -460's that had the round water holes and no sparkplug water troughs.

He, He!! I spit cast-iron dust for three days!!

pdq67