p51 heads vs tfs heads

so in essence you are gonna weigh about #3200 so you need about 850 to 875 hp to run 9.0 to 8.9 somewhere in that area...


faster if weigh less


Randy

i realy like the ultra block , prob could stay with sbf but , im not ,I want a bbf use a carb and keep it simple


but i have no clue were to start after i buy
ultra block

do i do 4.3 or 4.5 stroke

do i do 600inch engine or a 500 inch engine it seems theres so many options , me using sbf i know the 331 bore/stroke ratio is better than
the 347 ect , but now being new i have no idea , alot of people say(no replacemnet for displacment) but i want a good combo that works

i dont care if i have the biggest bat at the playground lol

No one is trying to pick on you in my opinion.

There are a couple of guys on here running great numbers with the P51 and TFS streets, but they are lighter by far, as in the case of Randy Moore(KY Jelly), who I believe is about 2350#, and running 5 teens with a 562" P51 head combo. Blake is close to your weight or maybe heavier and runs in the 8's I believe, but I'm sure he would tell you he was about maxed out with the TFS Streets he was running. If my memory is correct, he's running some iron CJ heads now. My point is you need to truly decide what your goals and expectations are and design a budget around that.

I think it's unfair to compare a Vortech blown small block to a naturally aspirated big block. Two different animals.

Everyone is here to help, but it all depends upon what you really want. If low nines/high 8's are it, then the P51's will get you there, but, if you get there and then want to go faster it's going to be difficult with a set of heads that are close to maxed out. That's the point, you just need to decide what you want . The proven builds section would be a good place to look around if you haven't already.

5pointslow!! if I was you I would call or PM Lem and talk to him, he will tell you what you need to make a good combo or he can build it to, and then you will be called
5points FAST

Ky Jelly has a 562 making 951 hp out of a P51 headed engine, so it can be done, I have a 552 inch making in excess of 800 with TFS streets and feel I still have 100 more in it... Blake made 861 with 557 and TFS streets so it can be done easy enough..... Ky Jelly also Ran a 533 with Super Cobra jets that made 882 hp with a 2 bolt block, Boo Boo has a 572 making 886 or so with Super Cobra jets so pick one and run.....


Randy

The a heads are definetly the better bang for the $$$$ IMO,. You can get them cnc'd later when you have some extra$$$.

a460 heads are better than p51s i got ya

570"s with a set of A's loved on in the right spot (not max ported either), right cam, some good compression.................1000 hp n/a is very doable.

A good block, forged crank (or billet), along with good supprting hardware will ensure it lives a good life.



Now if a person already has a set of cyl head castings be it P51, TFS street, alum SCJ etc then port work to make these support good power is gonna be cheaper outright than a complet set of A's.........if you are starting from scratch get the A heads and be done with it.

the Coug wrote:so in essence you are gonna weigh about #3200 so you need about 850 to 875 hp to run 9.0 to 8.9 somewhere in that area...


faster if weigh less


Randy

The big block will be 300# heavier than the small block? Thats 850 to 875 at the wheels correct? It seems he may be best suited with a set of A heads.

5pointslow wrote:a460 heads are better than p51s i got ya

If you get a chance check out the "cylinder head pecking order" post. P51 and A style heads are in two different families. P51s are great for stock port configuration heads. A heads are raised ports, more of a dedicated "Race" head.

"The big block will be 300# heavier than the small block?"
Can't be 300# more than the small block....the block it's self is less than 300# . After the block is bored [depending on bore size] it could be 30# lighter yet .

Yes , that's why I questioned that. He said his car weighs 2900 with him in it. "the coug" said he'd be at 3200 so I assumed that implied the new motor would be 300# heavier. Ya know what happens when you assume though I'll just go back to sleep

Brad I just took a WAG (wild ass guess) at it I just know he can build the hp in many different ways using many different combo's....


Randy

is there any more weight you can take out ? that car just sounds heavy to me . i know this is going to be hard to believe this . but my old motor 521 with out the box victor jr 514 heads went 8.82 in the 1/4 5.71 in the 1/8 on motor but the combo was dead on
my car has all most the same things your car has and race ready was 2970 with me in it and i am 225 .
i still think that there is some more you can take out . i am not a pro by far, just saying my 2 cents

ill see what i can do ,....this was with the dart block full efi and a blower and intercooler also

and the dart block is 1/4 filled to bottom of water pump holes

thanks guys just want all motor low 9s maybe breakhigh 8s ...... chassis work is unbelievable the guy that did it used to work for a guy building pro stock chassis and door slammers back in 80s and then opened his own shop

If you can't go in the 8's with a 3,200 pound car and 900 FLYWHEEL horsepower then you NEED to work with the car a lot more ... you'd have more than enough power.

I would also suggest to pick which is best for you and what you can afford, while also picking up something that you can work on later if you decide you want to go faster. Speed to me always breeds wanting more speed!
We had a small block in our tube chassis car, with iron roush heads and everything else n/a putting the BBF in only weighed about 130 pounds more than the SBF did. So you might be at or even below where you were before the SBF because the Supercharger, tubing, etc weighs a freaking ton(75-100lbs) itself so with a ultra block and aluminum heads you will be really close to the same weight as with the SBF if not less. We use the Kaase SCJ aheads and we like them alot but we are going to buy another set of heads sometime soon for our other motor and are keeping a eye out for some better heads for a good deal. I suggest you call Lem up and talk to him and go over everything you would like to do and he will steer you in the right direction(done quite a bit of work for our motor) and he is very good at what he does. Just my 2c.

Doug

i figuared the ultra block would be a good starting point
tro build off of , i have a stock 460 2 bolt block from 77 lincoln but not using , i also was wondering if the ultra block is pretty much the same as my 460 2bolt block so i could mock up for ultra block for midplate, but ill prob just wait

too many options 4.3 or 4.5 stroke , heads a460s, p51s, cobrajets(kaase) ect
.....alot to choose from at least i know the block im getting lol gonna order block tommorrow and get shipped to my work to save on shipping

The ultra blocks are miles ahead of the factory locks, either one of those or an a460 block would be my choice.

You can use a stock block to setup your engine plates