Those heads will choke the life out of a 347.Thank you LILCBRA for your invitation to this thread.
I am a beginner Mustang 68 302 owner. I am going to buy a 347 stroker kit with Summitracing and I have some questions, like what kind of heads cylinders to install, a friend of my sell really cheap a GT40p. Somebody knows if it works? Will be a good idea?
I am looking just for a street "sport" car, no NOS, no track, no supercharger. I think I don't need forged pistons or forged crankshaft right?
Mustang HT '68 302, Mexico build, mexican engine, Tremec T5 Mustang '95 + rear end 8.8" posi + 3.73.
Thank you in advance.
2000xp8Good porting will cost as much as better heads and still far way short.
I'm biased, but i think gt40p heads are paper weights.
I'd be shooting for at least TFS 170's, afr 165's. No they aren't budget, but the heads make all the power.
And even with those heads, that would be settling imo on a 347, i'd really want 11r's or 185's (or better).
I assure you, buying quality heads (even if it takes longer to get the money in order), will save you money and make more power in the long run.
There really isn't any point in building a 275rwhp 347, when you could do nearly the same with a junkyard explorer engine for $500.
Hi Potomus Pete,The trouble with porting is the price. A time consuming process for a machine shop. I see finished P heads on Craigslist for six hundred .
Hi General karthief,Look, if you look at flow numbers that a 347 needs to just run good you will find the answers, think of it this way, it would not pay to put 289 or 302 heads, even ported to within an inch of their lives, on a 347 stroker engine, you would be better off putting 351 heads on it (ported of course).
Look around here and see what heads are on similar builds.
What is the plan here? You have to have a plan, if you don't you will waste your time and money ending up with a high rpm engine you won't drive around town or a slug that barely gets out of it's own way.
It ain't just a set of heads, it's a cam, trans type, rear gear ratio, tire size, vehicle weight not to mention how/where you are going to drive it.
If it's just a street car than don't get caught up in the 'I gotta get every ounce of hp I can.
A 300-325 hp car on the street can be dependable and very fun to drive.
But you have to have a plan.
Hi LILCBRA,@CrisNavarro as I mentioned in the other thread, I believe these would work fairly well and they're probably about the best deal dollar for dollar. If the flow numbers are legit they should flow well enough for a 347.
Maxx 180 SBF (Sold in Pairs) - PROMAXX Performance Products
The SBF Maxx 180 is an as cast head that beats the competition. Don’t let the size fool you, flowing over 260 cfm, this head makes real power. It puts out up to 20 hp over the competition.promaxxperformance.com
They were on sale a few months back, I think they were <$800/pair directly from them. If you're patient you may get lucky and get them for a decent price. I have them saved in my favorites so I can try to do the same. And as I said before, @a91what has a set and likes them as far as the initial impression. He posted pics on page 3 of this thread.
I live in Mexico, but and the end of the year I return to Spain with my Mustang...You being in Spain makes a difference in dollars and cents compared to here in the US. I don't know the price and availability of aftermarket parts there but I can figure that 'making do with what is available and you can afford' is a factor.
Yes, 351 heads can be installed on a 302 block but the work/cost it takes to do this compared to using aluminum heads today does not make sense.
It is in my plans...Cool.
grab some extra parts and stuff em in the stang when you go back. Your 'stang friends will thank you.
So forget about flow numbers, why? Flow=hp and guys like in the above video have proven that these are a solid budget minded choice, myself included. These dont just have large lift numbers they perform well at low and moderate lift.Forget about flow numbers.
They don't tell the whole story.
Forget about all types of cheap ported heads, they don't make financial sense.
You probably won't find too many guys here with ported heads these days, it's been long proven it's not an effective use of money.
You are going across the world where likely there won't be nearly as much american muscle support and certainly less chance to do it right a second time.
If you are really building a 347 and taking it across sea, do yourself a favor, don't buy cheap no name anything.
Do it once and do it right or you may have a 500lb anchor when you get to spain.
I'd even consider a crate engine or long block.
So forget about flow numbers, why? Flow=hp and guys like in the above video have proven that these are a solid budget minded choice, myself included. These dont just have large lift numbers they perform well at low and moderate lift.
Quality, flow, and cost are the only determinant factors here.
Myself and other members have these heads on our engines right now. So yeah.Are you suggesting the video in post #76 is proof that these are good heads?
Far from real world usage test.
Could they be fine? Of course, But If you were dragging a set of heads half way around the world this is the set you would choose?
They guy is crossing an ocean, i would leave nothing to chance.
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