1badrocZ

iTrader: (1)

hey guys, ive been doing some research and i can not find a definate answer on what headers are going to work with my combo. Heres what i have: 383 with fastburn heads and 450+ hp and a tremic t-56 with spohn crossmember and torque arm. From what ive read, longtubes are out of the picture because i cant use the mufflex y-pipe with the torque arm, and the D-port hedmans are only 1 5/8", which i dont think will cut it for 450+ hp. Ive heard SLP's dont match up well, what are my options? What is everybody else using? Are the LT1 heads d-port? what do they use? Its getting time to drop this motor in and i havent got my exhaust figured out!!! Any help would be appreciated!

ScottyRS

iTrader: (2)

I'm building a 383 too and was wondering about the headers on the fastburn heads. Most people keep telling me that regular headers work fine and that a lot of the guys that swap in LT1s use them.

And you can always have a Y-pipe custom made to go around that torque arm.

1badrocZ

iTrader: (1)

From what i was reading "regular" headers don't cover up the exhaust port. Even the 1 3/4" slp's do a poor job of covering the port. What the heck are you supposed to use? Do LT1 headers fit in our cars?

Air_Adam

What do C4 Corvettes use for headers? The 113 heads are D-ports as well, are they not? You'd probably have to use something similar to what they use, although for an F-body obviously.

Firebat

iTrader: (7)

Me and other LT1 swappers use 1 5/8" primary tubed THIRD GEN headers as a minimum. I've had problems with hooker 2460 shorties just becuase those headers don't make the surface smooth on the side that bolts to the head(had to sand/grind it down). I think the hedman d-port shortie headers would be best.

LAFireboyd

iTrader: (3)

I'm not positive about this, but I thought the Firehawk's engine used the fastburn heads with the D-ports. And didn't SLP use its 1 5/8" headers on those?

ScottyRS

iTrader: (2)

Any long tube options for this?

jms

iTrader: (1)

I've had a set of FastBurns for a few years now while I gather parts to complete my 400 (+.040).

I used to have a set of Edelbrock headers on my GTA. I got in on a SLP header group purchase a few years ago and ordered a set of SLP 1-3/4 (non-air tube) headers to replace the Edelbrocks.

I pulled the exhaust valves out of the FastBurns (sitting on my workbench) and bolted up the SLP headers before putting them on my car.

The SLP headers are a SERIOUS restriction on the exhaust port when looking through the exhaust port from the valve seat area.

I'm talking 1/8" to 1/4" overlap (blocking exhaust flow out of the head). The restriction comes mostly at the top of the port.

I considered "porting" the headers but there is NOT enough material to port on the headers.

However, in the past, I posed a similar question (to the original which opened this thread) and received a couple of interesting solutions.

One of which is to weld up the header bolt holes and redrill them lower on the flange which in effect moves the tubes up on the head about .200".

Another solution offered was to install a Stahl adapter on the head and then order a set of headers with the Stahl pattern which allows up to a 2" tube size.

I personally still haven't decided which way to go. However, with fuel as high as it is, I'm in no big hurry to finish the engine.

Perhaps, by the time I am ready, there may be a "real" solution rather than something half-baked.

jms

1badrocZ

iTrader: (1)

I was thinking about sacraficing some hp and just going with the 1 5/8" D-port hedmans. I believe they have 3" collectors unlike the SLP's , so they might not be too bad afterall. To me, it seems like this is the simplest way to go. I wonder if the d-port headers actually match up well or if they would restrict the exhaust port too. Wish i would have spend the extra $ and got a set of AFR's.

Firebat

iTrader: (7)

dont know for sure, but check out summitracing.com

1badrocZ

iTrader: (1)

For those that have done the LT1 swap which headers are you using? Is there any problems getting Lt1 headers in thirdgens? Does the Y-pipe fit or do you have to make one custom.

Firebat

iTrader: (7)

The LT1 swap guys don't use 4th gen headers, they use thirdgen 1 5/8" primary as a minimum.

1badrocZ

iTrader: (1)

Do they use the D-port hedman headers? Does make a d-port header?

ScottyRS

iTrader: (2)

Would 1 7/8" be big enough?

Hedman Husler Hedders: HED-65173 - summitracing.com

Firebat

iTrader: (7)

some use 1-5/8" d-port hedman headers, others use oval 1 5/8" headers.

Fastburn heads might be a different size than LT1.

SDIF

I have no experience with these heads, but it seems the idea of relocating the bolt holes is the most cost effective and feasable solution.

Do these heads take a different exaust gasket? if so it may be used as a template.

What did / do the factory exaust manifolds look like?

Seems chevy could have moved the bolt holes up on the head and solved a problem before it was created.


Good luck.

1badrocZ

iTrader: (1)

I think i might give the hedman LT D port headers a try. I cant find much info on people using them on fastburn heads but i guess ill take a chance. Anybody know if the LT1 and fastburn exhaust ports are the same?

todd200

Only ones I know of is Hooker 2210's

Chris's 85z

I Used the hooker 2210's on my new ZZ383. Did a gasket check and they fit the d-ports perfect and the headers. All I did was bolt the gasket to the head to check for fit and then put them on the headers and they were a perfect match.

Good Luck.......

redcamaro83

how do the edelbrocks match up?

jms

iTrader: (1)

Not even close.

jms

1badrocZ

iTrader: (1)

I went with the hedman d port longtubes and as far as i can tell match up great on these heads.

88 350 tpi formula

iTrader: (9)

slp try-y headers I thought which are no longer made and were 1 5/8" I thought

'Shifter

iTrader: (2)

What about one of the build-your-own header kits, and just use the flange
and weld them up where they need to be, then cut the flange off a set of
regular headers and weld them together.....