exhuast manifolds

I've been reading many posts, and I keep reading about performance exhaust manifolds. Does anyone know if any are available for the PCM 454 chevy motor.

Redoing the motor this winter allong with the floor.

Theres tons of manifolds out there for big block (and small block) Chevies. CMI and Eddie Marine come to mind, but there are several others. I wish there were so many choices for small block Fords!

Its also worth checking out Hi-Tek Marine out of Australia. They are the only company that I have found that makes high performance manifolds for Fords. They make stuff for Chevy too.

'79, I apologize, i believe you brought these manifolds to everyones attention here first. I did actually discover them a few months earlier (on the donzi forum) and had spoken with Allen twice. I had only expressed mild interest and was trying to gather more info at that point- it was very surprising to get a phone call directly from the owner in Australia! The Hi-teks are next on my list after I get the interior finished.

Boat Dr, is that for the polished or powdercoated? When I spoke to Allen a year ago I think the total price would have been ~$1700 (US) for the powdercoated, shipping included.

If youre talking $1550 for the polished, then I might not be able to pa$$ that up. I a$$ume these are the standard SBF with 1 3/4" primary and 3" secondary, correct? I know they are essentially the same physical dimensions as the PCM manifolds, so they will fit under my motorbox- but will they work with tall valve covers? I didnt think it would be an issue until I (recently) decided to go with roller rockers. I know there was some fitment issues on the first set he made for the donzis- but that may have been a 4" collector.

Just a heads up but 87BFN would need a set for a BB Chevy- not sure if that would change pricing.

I would really prefer polished, but Im not sure if its worth $300 more. Ive heard that the PC will burn off at the base of the headers- too bad he doesnt use jet-hot coating, which I would think would be more durable on an exhaust.

I a$$umed you meant $1387+150 shipping, but I wont complain if the total is under $1400!

TRB not real good at this typing thing 1-318-386-2825............. the boat doctor billy sutton. am waiting on a call from Aust. to firm up price ,finish ETC...........call me

yes, it was straight up US dollor including shipping to IN, but I would push for the polish at the price he gave the doc with the group sale.

I spoke with Allen yesterday too. His workshop is about 45 mins from me.

He indicated that he was doing a special this month on manifolds, and that he had interest from the usa for a few sets (obviously you guys).

His quote to me was 2200 + tax (for powder coat), which is about $1800 USD with the exchange rate.

I'm looking for manifolds too. What was the price break he was offering.?

I could get them out of Cairns Australia for a good price. I had my manifolds Custom built out of 2205 s/s with built in extractors as well. Cost about $2200 Aus. Found to be saving fuel with a bit extra horse power. Good choice to go with s/s for longer life. Let me know if you want any photos or if I can be of help in any way. Chopper, let us know if you need a quote down there...
Regards
Ronstar...
93 Ski Nautique

Yes, the hi-teks retain the water cooled exhaust. Theyre essentially a header surrounded by a water jacket.





I got the chance to speak with the Boat Dr himself last night- very nice guy. He can correct me if I mis-speak, but we would need at least one more person interested in the SBF manifolds to get the special pricing ($1387 US, including shipping). I know the Boat Dr and I both want a bare finish, but perhaps the same price could be given if someone wants theirs powdercoated.

Eric, he may be worth checking out. From what I understand though, bending the headers is the easy part on these manifolds. The real trick is forming the water jackets. The only other company that Ive been able to locate that was willing to make Ford marine exhaust manifolds was CMI. They quoted me $3350 for satin finish, and $3500 for polished.

Considering that, $1387 (shipping from Australia included) for the Hi-teks seems like a pretty decent deal. We arent in a tremendous hurry, but we do need at least 1 more person to get that price.

Anyone interested? '79?

This is the same set up as above, cant load up photo of manifolds on boat...

This was the first set, Not much time put into the welds or polish. Choice of 3" or 4" hose. I went for 4" as it suited the rest of my system.

Ronstar, what do the headers look like under the water jacket? Got any dyno results?

Hi-tek has dyno tested their headers to produce 15-25 hp across the RPM range on a stock small block. I believe they have a 3" collector on the header themselves, and a 4" OD including the water jacket.

Eric, I know Im after the power rather than the looks. Ive upgraded the whole top end to improve breathing- cam, intake and heads. I think the biggest restriction at this point is in the exhaust, so that is where my money will go next.