ok I have a set of 66 closed chamber 289 heads and a set of 70 model 351w heads...If I wanted the most benefit to my 302 which heads should I use...the 289s would raise compression, the 351w heads might breath better....feedback please....yes I know aftermarket aluminum heads are the way to go but that ain't happenin right now...Jim:confused: I am running flattop pistons now 9 to 1 compression with 260 comp cam c4 and the all powerful 3.00 rear pegleg gearing....new gears and cam etc next year sometimes.
The bolt holes are too small. You would have to modify them to fit and I'm not sure how possible or feasible that is. May be a mismatch with the water jackets as well...Not sure...
Jim, I'm going strictly on memory. I thinking back 30 years when I was 4 years old. In 1975, I put a set '69 heads on a '68 302 block. The Ford Off-Road area, now called Ford Racing, SVT, or whatever coached me on this build. Running 12.6 to 1 pistons gave me a compression ratio of a little more 11 to 1 (fortunately, 100 octane gas was still available). I pulled the rocker studs out and put in screw-in studs with no shoulders so as to make the rocker arms adjustable. I used Boss 302 push rods. It was a good setup. I won't go into all the details, but the engine pushed my '67 Fairlane to very low 12 second times. I believe, in the long run, you could make more power with less compression using the 351W heads than using the 289 heads. BUT, it is all a matter of preference. I did a lot of work on my 351W heads. I had bigger valves put in and I did some moderate porting (more than gasket matching). But, hey, I was 4 and I was wanting to learn to do stuff myself.
Terry you never cease to amaze me...I was 14 before I built my first engine,lol It was just a thought I was having...gonna build up my engine this winter a bit.Feedback helps...the 289 heads already have screw in studs and plates for the pushrods installed.....
My opinion would be to use the 289 heads...they would flow more than enough for the cam you have and if you are worried about the comp ratio being to high then I would use a thicker head gasket...the 351 heads would lower your comp ratio more than it is now unless you plane them...just my thoughts
nope T L both the 289 and 351w heads are a direct bolt on the 302 the 351w bolts would have to be used to sug up the 351w heads but they will fit.
You will need to drill and tap the block to use 351 head bolts in a 302. You can just use 302 head bolts with these though... http://store.summitracing.com/partdetail.asp?Ntt=302+head+bolts&N=0&Nao=20&part=TFS%2D51400419&autoview=sku&Ntk=KeywordSearch or get the kit... http://store.summitracing.com/partdetail.asp?Ntt=302+head+bolts&N=0&Nao=0&part=FMS%2DM%2D6065%2DD289&autoview=sku&Ntk=KeywordSearch
I think I'm gonna go with the 289 closed chamber heads for now but I'll keep the 351w heads for later...
Porting I've got a set of 66 heads that will go on a 302 eventually also, porting will make them work pretty well. I posted a build list a while ago on a gt40 head thread that used 66 heads and made 400hp and 400 torque. But well ported. And a bigger cam of course.
You're better off using the 289 heads right now. They will compliment your current setup much better than the 351 heads. With that cam and rear gear you'll need the extra "umph" that the compression increase will provide. And for the record: You can use 351W heads on a 289/302 block. You don't have to use the shouldered washers but they do help keep the head planted in one spot. So T.L., get your information right, Bub.
You haven't told us what heads you have now... How do any of the folks answering your question know that 60cc heads will drop your CR when they don't know what cc heads you have now??? The 351 heads will far outperform the 289 heads IMO. Bigger ports, valves, and nearly as small a chamber. No contest. Unless you are already running small chambers, you won't lose much, if any CR. Dave Edit: Oh, you are in Memphis... Well I have re-thought my position and think that maybe these heads will really suck for you. To make sure your Mav is safe, I need you to run the heads down to Yale Rd and drop them off at my Dad's house for safe disposal!
I must have misunderstood what he was asking; It sounded like he wanted to put 289 heads on a 351. Well, being that the bolt holes are smaller on the 289 heads, I don't see how they would simply "bolt-on" without some major modification. Obviously I read it wrong. Either that or I read it before he edited his post. I can see now that he wants to bolt some heads onto a 302...
ARP and even Ford sells bolts for installing 351Ws on a 302 block. I used the Ford ones in mine. They are slightly longer and have an integral washer under the head. Even better yet install some ARP studs. You definitely don't want to use a thicker head gasket to lower compression. It will kill the quench characteristics of the head. For proper quench the piston should come within .035" - .040" of the head deck. Without proper quench the engine can run hotter and be more detonation prone. I would run the 351Ws, as mentioned before, way better valves and ports and you can have them milled cheaply to raise compression, if needed. According to Ford, with equal compression, the larger ports and valves of the 351Ws is worth 30 hp over 289/302 heads.
thanks guys for all the info, Ratio I'm sure your dad would take good care of the heads, lol but I'll hang on to them, lol. I have about a month to get things ready, I'll go from there...again thanks. The heads are stock 72 302 heads nothin special.
I'd port the 351 exhaust a bit and bolt them on. Thats my plan for my engine as well. The 66 289 heads might have smaller combustion chambers, but the flow didn't change much through 75ish. Once they made the jump to the 69cc chamber heads, well, those heads just suck. Before that and after, they all flow similarly. C8's, D2's and E7's are pretty damn close stock. I can't imagine the C5 or C6 casting being that much better from factory.
