Who has a STRAIGHT 6 in your HotRod? Come On, stand up!

Fast one

 

Yepper that it is. The Twisted6 has run down many of the Vthings. Nice pick-up six ball

 

I'm curious as to how the motors are linked together. Do two cylinders (one from each engine) fire in sync for 6 monster power pulses per revolution or are the engines staggered to provide 12 evenly spaced pulses for smoother torque delivery? In a drag race application which would be better? My guess would be the former will give a better 60 foot time while the latter would provide a lower final 1/4 mile ET. Maybe it doesn't matter unless it did!
Best Regards and good luck with all your endeavors, KB.

 

Most twin engine of any type are normaly linked via a coupler crank end to crank snout. With a dist. on both motors.
not linked in anyway.

 

My guess would be dependent on how stout the rest of the drivetrain is.
If you have some really heavy duty parts and super sticky "big tires", then 6 "monster" pulses would be the way to go.
If your drivetrain is more "slightly modified standard car" fare, then you might be better off with 12 "regular" pulses.
So how would you synch the motor for 12 pulses?
Crankshaft on one engine 60 degrees off from the other?


6narow

 

I'm guessing both #1 cylinders fired simultaneously and etc.
I'm guessing it would be easier on crankshaft life if done that way - especially the rear crankshaft.

 

The same guy with the pickup I last posted has a Farmall that he take to tractor pulls that has two 235 Chevy 6s mounted end line. It's a beast. Another friend had a dragster with two Chevy 153 four cylinders that ran on one V8 distributer. Just because he could.

 

...and then there's the guy in Australia with the '32 that he dropped a GMC 702 into. Very nice mod and goes like stink!
Here's one of the vids of that car...

702 was two 351's bolted together. My dad worked at a dealership in Salina Kansas back in the 60s (Flemming Motors.....anyone?) and he did that mod for one trucker.
Guy did an 8-wheel burnout right in front of the shop!



6narow

 

Ive got a stock(for now) 230 in my 63. Its got 89k orig miles. I built a header out of stainless an am gonna add a cam, lump ports, and i wanna turbo it. I love the sound of an inline with a header!

 

Still have a stock 215 in the wife's Plymouth. Haven't made the final call on whether to hop it up or put a 318 in there. I'd like to keep the 215, but I want an auto and A/C in it for her and the grandkids, so that will probably be the deciding factor. I'm still on the look out for a certain Mercedes 6 I wanna put in one of the T's! >;-)

Posted using the Full Custom H.A.M.B. App!

 

Nice job on the manifold.
I like the chromed valve cover, too.
Remember though, the 6's were red. Only the v8's were orange.


6narow

 

I have a 250 with a close ratio NP435 going in my '36. Going to run 307 flat tops, big valves and lump ports eventually.

 

That's a lot of transmission! Or did they make a 435 without the granny first?

 

Big Cheese,

Yes, that's the "close ratio" version RodNoc referred to. It has something around a 4.02:1 first gear. Drive it like regular ol' 4-speed.
I agree, HUGE tranny, but working on one is like working on a Detroit.
A 5 year old could put one together.
I used to service/rebuild them all day long back when I turned a wrench for the moving company.
...in fact, I still have an input shaft for one that fits a 330 Y-block (or maybe, I did?).

What I'd like to know is.....307 pistons fit a 250?
I know both use the same diameter bore (so does a 230, a 292 and a 283, for that matter), but what about the pin height?
This is news to me.....also, I don't recall 307's ever being offered with flat top pistons.
...hmmmm....


6narow

 

307 pistons are flat top with either 2 or 4 valve re-leaf And they will work with the 250 block. The 230 can use the 283 pistons.

 

Check out the 250 Ross pistons that Tom Lowe sells. They are forged flat top and a little taller.

 

Hmm, I just don't remember it that way, but its been a while since I've been into a 307, so I'll take your word for it.
Didn't know about the ability to use the V8 pistons in the 6's.
Very cool!


6narow

 

There was a discussion somewhere about pin height and it seems that in an attempt to control compression on over bored rebuilds the piston makers set the bigger pistons farther down the hole than stock. In my 153 with a 181 crank307 pistons would have worked well if not for that. Tom's 250s are near perfect. I have a couple of sets of .040 over 307s. One set has 4 valve cuts and one has 2.
Here's the 2 cut one compared to Silvolite 250s. The last two pictures are a 307 and a Ross flat top for a 250.https://picasaweb.google.com/sixpic...&authkey=Gv1sRgCO-Losj327SrBg&feat=directlink

 

The GMC 702 V12 was NOT two 351's bolted together.

It was a unique 12-cylinder block/pistons/rods/crank/etc., with four 351 heads.

 

Hey, thanks for the info!
Except for the last two pictures, it appears the 307 piston was always on the right, correct?
Learnin' tons lately!
You guys rock! =)



6narow

 

My dad worked for a GMC dealership in the 60's, when those engines were in production.
He had tons of experience with them.
It's what he always told me.


6narow

 

Never let the occasional inaccuracy interfere with warm and loving memories.

 

Yes, 307 0n the right. Notice the huge Chamfer on the top edge of the 250.

 

Here's a Ford 200 with a C4 going in our Model A roadster. Doing it to be different and because everyone and his mother has a rod with a V8.

 

I'm trying, but people keep calling me on it!

 

Yeah, I saw that. In fact, I've seen it in the past and never really thought much about it, but since its been brought to my attention, what is that all about?
It seems like it would throw at least part of the charge out onto the cylinder walls.
Not good, to my way of thinking.


6narow

 

I run a Ford 305 big six in my RPU - alarmingly consistent.

 

250 pistons ".........what is that all about?" I don't know but it is common.

200 Ford in a Model A, I like it. I'm not up on Fords inlines. Is the 300 longer than a 200? Is there an engine between those. What is the year range?

 

Don't know about the length of a 300, but we are going to have to notch the firewall to get the 200 to fit. The 3rd generation sixes were 144, 170, 200 and 250. The 200 came out in 1963. Don't really know much about the later ones but I think the 240 and 300 came out in 1964.

 

The 300 is about 37 in. long. I have one in my Model T coupe. thanks.