Can worked J heads ever flow as well as the Edelbrocks?

[tubtar]

You would move the intake guide over.

And that is always an inexpensive procedure.
I think the original poster was not looking to maximize a set of J's , but wondering which was the most cost effective for his end use.
A set of ported J's with unknown flow numbers or Eddies.
I am partial to chunks of aluminum on small blocks though , so I may be biased. LOL

 

[AdamR]

There's a lot of guys running j's into the 11's. the F.A.S.T. Racers use them and are getting around 290 cfm that's with 2.05 intake valves and a lot of work and money! Nothing more uglier than that squared off chunk of aluminum sitting on a nice sb.

Heres a set of J heads from an 11 seconds FAST car. Notice the epoxy.

 

[rumblefish360]

Nice head shots fellas!

Tubtar is taking coolant from the center. How many times have I mentioned that move/mod?!?!

I think the OP can use the J heads cheaply and effectively for the build he is looking at. He doesn't need to spend the money on the Eeelbrock heads and then more to make sure there golden for use.

 

[bignick]

I don't see what the big deal is to get J heads to go into the 11's. Easily done without max porting. My old combo: .030 360 zero decked flat top 2 valve relief piston (11:1), Mech. flat tappet comp cam .525 lift .235@.050, stock rods with polished beams and arp bolts, stock crank, old torker manifold, 750 holley DP. 904 trans man. valve body 4200 dynamic converter, 8 3/4 4.56 gear in a 3300LB duster went 11.50's all day. Only thing done to the heads was gasket match both Int./Exh. and blended that size to bowls, put on a "hog" machine ( cuts the port under the valve same size down to bowl), 2.02/1.625 Ferrera 6000 valves 11/32" stem and a comp. valve job. I don't think they would flow more than 250-260 @ .550-.600 lift

 

[1wild&crazyguy]

Get flow numbers, a lot of people out there really fk these heads up by making them look pretty.

What does an eddlbroke head flow out of the box, 240 something?
What does a factory 2.02 j head flow, 225-230?
One costs 750.00 ?...the other 1,450.00?
One with added porting costs around $1200.00-$1400.00 ?
the other with added porting costs $1800.00-$2400.00 ?

What kind of records are we chasing after?
What does it take to have fun and be fast?
How many times have we seen someone get the same results and spend less or more or by doing it this way or that way.

Just close your eyes and throw more money at it.

 

[Abodybomber]

There you go again, with common sense.....FWIW,I helped assemble,a nice 340 street car. 11:7 comp,roller cam250/260@ .050. The customer, had a set ,of WELL worked Manning-Brady X heads .The boss,did a good valve job,good stainless valves(obviously, ported already). The car,went 11:70's @ 118. The customer, wanted Eddy's. Bought a set(1998), on customers request. The boss argued,a waste of coin. He worked,the heads well. Push rod pinch,to Max. Raised the roof ,streamlined the v.g boss. The car,went 11.60,same trap speed.

 

[FrostyMopar]

Kram1976. without seeing the J heads and the porting work we can't really tell you much.

They could be a fantastic bargain, or they could be pure junk.

Over here in Australia, $750 for a set of J heads is about normal if they're in decent restorable condition.

 

[273]

They moved the exhaust valve over to fit the 2.19 intake valve in along side the 1.60 exhaust

 

[Abodybomber]

Got a clue,would that would cost?.On o.e. head s?. I ported a set of Eddy's,no valve job . Spent40+ hours,on them Flowed280@.550 Think about, R.O.I...

 

[longarm]

Did you buy them?
If in the end it going to be blown,
it will be stupid fast for the street
no matter what heads.

 

[Kram1976]

This is all I have to go by. Im going to call him today and get more info. You guys are awesome.

 

[rumblefish360]

Ooooo crossing the fingers for ya bro! Hope this works out!

 

[Kram1976]

Just got off the phone with him. Yes they were flow tested had some really good numbers but he sold them a week ago. BOOOOOO!!! O well that is what I get for dragging my feet. On the bright side he has a '67 block for 150 bucks. He is sending me more info on it tonight. Since my car is a 67 when I pull the motor I may just pull my block and swap it. I am still looking for more info on the one I have. The build date is 1-21-71. Was this a 10.25 c-ratio block or 8.5-1? I cant find any difinitive answer on this. Now I know that it could have been changed in a rebuild but I am just curious.

 

[moper]

Too bad on the heads - but beware of big number Mopar stuff for cheap. Cheap price and numbers don't usually go together.
A '67 casting block would be for a '68 model year vehicle, especially in 340s. If you look at the front of the block, driver's side, directly under the the head gasket surface there will be stamping. Get those numbers and we can tell you what it was. Chances are good if it's a forged crank engine it came with the higher compression pistons - which means the true measured compression was closer to 9.8:1. If it is a cast crank engine it should be the lower compression pistons, which were closer to 8:1.

 

[Kram1976]

I have them just was not sure what I was decoding
1-21-71 Day time build, GM 340p 35870020