Im gonna put this in my 88: L98 bottom end, 52cc heads from no idea what, performer intake and 600 carb. 224/234, 465/469 cam. This car is gonna be only for the track and cruizin the strip, so Im gonna spend the extra $900 or so on a rebuilt TH350, 2500 stall convertor, mini spool for the 3.42 open rear, 1.6 roller tip rockers, and BFG D/R's. Can that get me mid 13's? I just need a cheap setup to give me respectable V8 times at the track. I know if I hook up some nitrous I should be able to get low 13's.

 

Getting into the 13's with a carbed 350 isn't hard at all. You should be able to do that with your mods. Whats with the 52cc heads?

 

There just something I have laying around and there in excellent shape. All i did to them was put screw in studs in. This engine is just gonna be beat on so I dont want to put much money into it this time around. Next year the car will get a forged/supercharged engine.

 

Are these heads aluminum? If not you are going to have to watch your CR with stock pistons.

 

52cc....that sounds like LO3 heads....DOnt use them if they are the horrible Swirl port heads....you'll never hit 13's with those.

 

I wouldn't say that. New light has been shed on ported swirl ports and they flow suprisingly well. I can say I am honestly shocked and have had to re-think my previous stance on these heads. Check out some of kdrolts posts on swirl port heads and the flow data that he has collected. Dewey should be in the 13's soon with his stock headed LO3.

 

I could only imagine the extensive port work that must have been done to obtain such numbers...

 

52..58...somethin 5#...my only point is they are not performance heads. Im pretty sure they are not swirl ports. This should just be a fun car to race then. Hope it dosent break after just a few runs like my last one!

 

58 cc aluminum sounds like L98 vette heads which ARE great heads. abit of easy porting can get them to flow enough to get 12's out of

that wouldnt be a bad setup for racing, although low 13's isnt much nowadays

 

I dont know if they're aluminum... If I can run a low13 at Quaker City Raceway here in Ohio, I can beat most Camaro's/Firebirds/Mustangs. Most 4.6 Mustangs here run high 14's. New GTOs cant even break into the 13's. It being an uphill track dosent help

 

go and get the casting numbers off the heads, then we can tell you what you have. if the last three numbers are 416, 081, or 601, you'll have a relatively good flowing head. i have some bonestock 416 heads on my 310 and i have gone 13.7@100mph.

 

The port work was not that extensive belive it or not. Siwrl port heads in stock form outflow 416, 081 and L98 heads on the exhaust side. They do not flow as well on the intake. They actually has the lesser of the two flaws. Port work on the intake side really improves things. However, it is better to flow more on the exhuast side because you will make better use of whatever intake flow you do have. I cannot even begin to explain how shocked I am at this recent data. I was too quick to jump on the bandwagon like everyone else. Just looking at eh heads make you shake your head. Once you get them on a flow bench and record some data and track times you really are forced to re-think your stance.

 

I must admit, this was my very reaction when I first pulled off the intake. I knew they could be worked, I just didn't think it would be that worth-while for me to do.

I've yet to purchase a set of heads for my 400-sbc though (unfortunately, funds are very tight at the moment). Would you honestly recommend going with the LO3 stocker's (after such modification)?

 

For a 400 I would look at the 193's (350 TBI) or 083's unless you have huge power goals. I would go with a larger chamber for a motor that big. What are your power goals? L98 heads (083's) are basically equal with the 193's but they have a flaw on the intake rather than exhaust. Port work will make any head better. There is a limit though and if you have large power goals you will need to go vortec (ported) or aftermarket.

 

I honestly did not set my power goals too high for this one. If I could make between 350-400 FWHP, I'd be a happy camper. Mind you, 350-400 FWHP utilizing the stock TBI system... in which I decided to stick with.

The block is finished, with every other part (minus heads) already being selected... so now it's just the matter of selecting the right heads. I'm more than likely going to go aluminum, but if the LO3's can support the above goal, then hey... I'd save a nice chunk of change.

The throttle body was just recently enlarged to two inches, and now sits on top of a Weiand Stealth manifold (with an adapter plate sandwiched in between). I'll give you my cam specs (Crane Roller) after I get it dynoed, and after I burn a good chip.

 

I wouldn't go with the LO3's on that motor because of potential compression ratio issues. You can get 193 heads for next to free and you can make an easy 400+ lb ft with those heads. You will need to port them though to take full advantage of what little potential these heads do have. There have been some recent combo's with these heads (ported on the intake side) running amazing times. Your other choice would be 083 heads which would need porting on the exhaust side. Your power goals are obtainable with either head.