Visual difference in 302 vs 347?

For sure not a Cleveland

 

The 1/2 head bolts refers to the threaded part of the bolt. 351w's use 1/2 thread pitch bolts and 302's use 7/16 thread pitch bolts.

 

Ahh, okay. I need to do some further examining then. By the time I get off work, it's almost dark these days, lol. Here in the next few weeks, the time changes. I'll have more time to piddle around.

 

That's an awful lot of pitch on a thread. 7/16" and 1/2" is the diameter of the bolt

 

Looks like stock rockers, with some sorta aftermarket locks or adjusters....

 

You have half of the equation there, measuring to the top of the pistons at BDC. Now think about how you will measure to the top of the pistons at TDC.

 

You're right I had a brain fart.

 

Most likely a 302. Definately has mid 66 to 1977 heads with those rail rockers. The valve retainers are one piece steel, those are not stock (although the early 289's had em, they were smaller in diameter than those)that and the poly locks on the rocker studs tell me the heads were most likely reworked. You still got a VERY good deal, even with that Fuggly HEI distributor cluttering up the engine. The date code on the heads is right there in that first pic, next to the valve cover rail. Looks like JANUARY 1968 (8A). If there's a "4V" cast in there, they'd be the 68 4bbl 302 heads, which while nothing more than recast 289 heads with 54 cc chambers, they bring a premium price to collectors restoring 68 Stangs. The Edelbrock intake is worth $100, the valve covers about $75, The Holley another $100-$150. You got your money's worth and then some.

 

Thanks for all the help and info, Baddad. It is much appreciated. Once it warms up a bit more, going to start unbolting, cleaning, and scrubbing. Going to be putting this in my '73 Maverick project. Been working on it for two years.

 

all the sbf i have seen with adjustable rockers have had oval push rod holes and thoose one look round i wonder if they had the positive stop studs in them and some one swaped them over but i would think with the larger hole you would need guild plates i mat be wrong thu

 

They look like rail-tip rockers. The rail centers the rocker over the valve stem.

 

The pre rail rockers had the narrow slots in the heads to guide the rockers. The switch occured in April 1966. From then until sometime in the 69 model year, the rail rockers had adjustable rockers. 69 was when they switched to the positive stop studs.

 

Got the chance to measure it today. It's exactly 3.0" Then we piddled around with it and got it to run pretty good. It had been sitting since 02, and had never ran for more than a few seconds. We ran it for a good 3 minutes. Within that 3 minute span, it had already used half a gallon of gas, LOL. We unplugged the gas line, and dipped it in a one gallon jug. I'm sure the tank was full of rust and I didn't want to chance it. Here is a video I was able to take. It starts to warm up around the 1:00 mark. Valve covers are shot as you can see steam come out of the left one. I had that one off there a few days back. It was cracked and frayed. It's a work in progress. Hopefully it will be transferred to my '73 and on the road by this summer.

http://youtu.be/-NEUzDR8H_I

 

That much fuel and that sitting that long, it's a good bet the powervalve diaphram is ruptured. Doesn't sound bad though. The puff of smoke outta the valve cover would worry me though.

 

It would worry me too if I hadn't of had the valve cover off a few days prior. Plus, the valve cap o-ring is stretched and wore out too.Right where that smoke came out, was where the cap was. For some reason, this one has two valve cover caps? I've always seen just one. Thinking about putting some new caps on it or covers altogether. Don't care much for the kind that just pop in through the o-ring. No smoke out the exhaust, no milk on the dipstick. I did get a good look at the top of the piston. It was domed. Yeah, I plan on rebuilding the whole carb. I just have to figure out what Holley carb it is so I can buy the rebuild kit.

The main reason I wanted to get it going an run it a bit ,was to see what all work needed to be done to it. The time changes the end of this week. That means I'll actually get to work on it after work, LOL.