centuryoldracer

I've had this 67 Camaro drag car since well dirt was created, and I haven't driven it in oh 15 years???
People want to make joke offers for the car which is after all a first Generation Camaro with a vin tag, and a title so screw it, I am building a pump gas engine so I can drive it around.
What I have so far:
I'm planning on using the block already in the car which is a GM Bow Tie with a 4.610 bore (I believe, can't remember exactly until I get it apart) might be 4.605 or 4.615, anyway I'm building a set of 24 degree AFR 335s, and porting them by hand. They flow about 415 CFM at .700 lift (out of the box was around high 330s to 340 CFM) in the good ports, and the port velocity is up about 25 percent from out of the box. The exhaust flow right at 300 CFM at .700 (actually 299)
I'm trying to use parts I already had so I have a Holley pro ram dual 4150 tunnel ram that I have ported extensively, and a Weiand D port dual 4500 tunnel ram that is untouched, a little taller than the Holley, and would need hours of work IMO with the porting tools, but may be better (opinions welcome) I would also like to reuse the 2 1150 Dom carbs that I already have for the coolness factor, and well Horsepower!
I plan on leaving the Dry Sump on it, and the Jesel belt drive. It will also still have a much smaller, but still big solid roller cam (the heart of the engine IMO)
What I need is a reference hopefully from a forum vendor on a rotating assembly, and a bunch of other odds and ends, nothing too custom, just a 4.250 crank with good steel rods, and forged pistons.
It will be around 565 cubic inches
Anyway Comments/ideas/advice welcome.
I will take some pictures of parts, and progress.
Thanks in advance







The progress is a little farther ahead than the pictures, the chambers are also worked to unshroud the valves, and honestly these heads are pretty dang good out of the box, but they are in my opinion spectacular with some fine tuning especially for a 24 degree head. They are well into c&c range as far as performance, and numbers, but they are only a piece of the puzzle albeit an important piece




It runs 8.30s at 164 the way it sits now or at least it did the last time I drove it. It’s currently in turn key condition, but not street able at all in its current trim. 17.2 to 1 compression and almost 1” if lift at the valve it’s pretty high strung

JimmyS5600

Im a small block guy so can't help with your build. That car is nasty!
8.30 is a quick ride. What is your car certified too?

centuryoldracer

8.50 but it only needs a couple of bars added to go 7.50
It feels fast on that small tire for sure

JimmyS5600

I can't imagine that ride on a small tire!!!

centuryoldracer

Most passes you need a rudder instead of a steering wheel,

JimmyS5600

Lol

C5 Pete

900 on pump gas is a pretty big ask… sure GM did it with their crate engine, but they have millions in R&D available.

But, they proved it can be done - which means others can too - including you.

You asked about which intake to use. I’d think the one with the shorter runners, provided the plenum was the same size would be a better starting place, though you could just use spacers to help out if the short runner intake didn’t have the volume you are looking for.

Have you reached out to Scoggin Dickey? I think they’re vendors here? Not sure. But they do build some good stuff and have some nice parts.

I'm looking forward to seeing this play out. Best of success to you!

centuryoldracer

I figure 800 is a given so anything over that is a bonus., but the more I get into this thing, and see past projects making 650-700 with steel oval port heads (granted they are ported to the max with bigger valves)the more I believe 900 is doable on pump gas especially with 565 cubic inches with huge bores that let the heads breathe even better then a typical 454/496 with a much smaller bore.
I'm leaning toward the shorter tunnel ram also for a few reasons, one is hood clearance, two is the manifold is already fully ported with literally days of labor, and three is the plenum volume can be adjusted with a spacer to increase or decrease, although I am looking at the adapters to go from 4150 to 4500 dominator carbs, and they are about 1/3 the cost of just buying new carbs so I might just buy a pair of the quick fuel/Holley brawler type carbs that have a 4150 flange so they bolt directly on without adapter plates


Got a lot of funny looks showing up with a NHRA Pro Stock car on an open trailer behind a pickup truck

This is in my driveway, I had just finished putting the main colors on it, and started the final assembly. I was in my 20s


I crew chiefed for this guy for a while, and built his race car. That’s me in the picture



Some pictures of my younger years heavily involved with other serious gear heads. I built this 4.500 bore 3.5” stroke (I think it was around 445 cubic inches)big block with seriously modified 24 degree heads 17 to1 compression, dry sump, sheet metal intake, split dominators before you could buy them that way (it took me about a week to figure out and build the throttle linkage)that made 980 horsepower

C5 Pete

Very cool stuff. Thanks for sharing. I’ve heard about split dominators before, but never really saw a picture of it done. Really cool.

tektrans

I think the heads will be your limiting factor for a pump gas 900 hp motor.
Last motor I bought for my old 78 vette was a 582 10:5:1 short deck with Brodix SR20 heads. Motor made 962 hp on 93 octane.

centuryoldracer

You wouldn’t have the specs to the cam you ran would you?
I’m trying to figure out what I should run in this.
i know running a dry sump is going to help make more power, and after the heads are ported they flow around 415 at 700 lift
exhaut is right at 300@700 so should be good with the tunnel ram and dual carbs

tektrans

Sure here’s the cam sheet.

tektrans

Sure here’s the cam sheet.


Dyno sheet in case you’re interested

tektrans

I'm sorry 958 hp not 962-idk where that came from lol.

tektrans

This was NOT with a dry sump-only vacuum pump.

centuryoldracer

Man that thing is stout especially with a single carb.
The dry sump is good for around 60 HP versus a wet sump without a vacuum pump, and the tunnel ram is at least 60-80 depending not because of 2 carbs as much as equal length intake runners.
Can you post pictures of your engine in the car so I can see how you configured your alternator, and other accessories?
It gets pretty busy in there with a crank trigger wheel, Dry sump mandrel, and cogged belt, plus a water pump, and vacuum pump.
Your car looks super awesome BTW
I'm also trying to keep the lift around .700 so it lives on the street, plus the heads only gain a few CFM over .700 The big air flow numbers happen between .450 and .700 because I did quite a bit of chamber work to un-shroud the valves.
What's your compression ratio?



This is the race engine The hole in the passenger valve cover was for the vacuum pump missing in this picture, and I never ran a alternator, but will need to on the street deal, and I will probably update the water pump to a modern electric one. It also won't have the cross over on the front of the heads for the water as they will be conventional head, and accessory bolt hole configured

centuryoldracer

Thanks for posting these pieces of information.
The cam in your street engine is very similar to the one in my drag race engine Believe it or not. Mine has a little more intake duration, and a 116.5 LSA mostly to clear the pistons because the compression is 17.2 to 1, it also has 1.8 T&D shaft rockers.
I think yours would make similar power to mine if your compression was as high. We found roughly 4% in power increase for every point of compression increase

tektrans

This was my ‘78 Used a Moroso bracket and I inverted it, then I worked w Jones for the pulleys and belts. I also had to fab couple brackets and had them cut on a water jet. Sadly I never even got to start this motor lol. I live close to Englishtown and eliminated drag racing while I was putting this together and it sat for couple years I was so upset I just lost all motivation. Sold it back in May and picked up my ‘07 in June.

tektrans

Cr was 10:5:1

centuryoldracer

Wow sorry to hear that. Similar story with our drag strip in Spokane thats been closed the 10 years i've lived in this area so it's time to put it back on the street.
Anyway you had to get pretty creative with your accessories, and I will too. I may not run the vacuum pump or may run a electric one because the dry sump pulls about 12" of vacuum which is probably fine for the street.
I wish you could have run yours before you sold it.
Thanks for the picture