HOT 261 L6 Chevy? 250 hp possible?

Stamped rockers? What engine are you talking about?

 

Dont you know? its the late 235. the early ones were made of tin foil - you dumb ***

 

Stovebolt 6 - you know the 54-62 engines - have 4 different rockers, forward and aft of centre, intake and exhaust.

Thats why there are no roller rockers in production for these engines.

let me tell you - if some-one was to step up and make some rollers rockers, or better still, some roller lifters for these engines .... boy could you really wake these engines up.

 

my 2cents: If you haven't bought a motor yet, put in a 292 with a lump ported head. 250hp easy. Tom Langdon sells an adaptor to bolt on an early valve cover on the late head. Significantly easier to get parts for, rebuild (did you know every main bearing is a different size on a 261?), put accessories on, etc. I'm putting a 250 in place of the 235 in my 56, with the early valve cover, and 98% of the people out there won't know any better.

But, if you already have the 261, then go with it. It will be fine. Although 200hp is generally acknowledged to be the limit of a street 261.

 

Okay, my appologies. I went brain dead, 'cause I thought I had posted this here.

You wan't roller lifters for the Jimmy, 12 port head (and EVERYTHING to make it run)?

None of it's cheap, but Joe Fontana is the guy to go to.

He's supposedly got a kit to make 380 Hp out of a 302 (or so I'm told) and that's supposed to be a 'street' engine, not cheap, but supposedly complete (cam, lifters, ***embled head, maniflods, etc).

Read about it here:
http://www.inliners.org/ubbthreads/...++jimmy+six+#35&topic=0&Search=true#Post44724

Gotta root around a bit, but it's in there (even if it is O/T for the thread as it started over there).

 

Not on the '53-'54 Corvette engines--they were made of aluminum foil for lighter weight and higher revs.

 

I stand corrected.

 

That's funny right there.

And for some reason the smiley's aren't working in this post. (well, okay that one works, why not the others??)

 

See, the thing about Heathen is that he is the "Parts Man" from the old Rodders Digest editorial Burger wrote years ago comparing Parts man to Parts Boy. He knows his stuff. We should believe him

 

Go with a 302 jimmy

 

don't waste your time on here. just go over and talk to the guys at inliners.org. they know their ****.

 

Thanks. Your $20 endor*****t fee is in the mail.

 

That's true. We're just a bunch of retards on this board.

 

Well one thing i noticed here has been that they dont mention AMC/JEEP 6,s much. here,s a little info on a 'straight 6' thats got some good hosepower figures stock! And abundantly available in wrecking yards [with fuel injection]

Jeep Engine Specs - 4.0 LITER, OHV, 12-VALVE SMPI POWER TECH I-6 - More Info
<hr style="color: rgb(209, 209, 225);" size="1"> <!-- / icon and ***le --><!-- message --> Description: in-line six, overhead valve (two per cylinder), flat-face followers, hydraulic lifters, cast iron block and head
Displacement: 3960 cc (242 cubic inches)
Bore and stroke 98.4 mm x 86.7 mm
Compression ratio 8.8:1
Redline: 5,300 rpm
Maximum power, 2003, Wrangler:

• USA - 190 hp (142kW)@4,600 rpm; 235 lb-ft (319 Nm) @ 3,200 rpm
• Europe - 130 kW (177 hp) @ 4600 rpm; 296 N·m @ 3500 rpm
  Fuel injection (final form): sequential multiple-port, electronic

 

hay with two 3/8 bolts brazed to your 292 valve cover you can bolt the 261 valve cover over it presto looks like the 261 and when your are at it cut and weld two 2x3 pieces of tubing to your intake and mount two rodchester two barrel carbs the wire welder can do this. I have built 5 of these engines drags to rat rods + vega 4 speed they fly

 

It's all about the time you're willing to spend. Money is part of it, but, how committed are you? Are you willing to develop all your own parts to achieve your goals?

A more or less stock rebuilt 235 with a mild cam, dual carbs and dual exhaust is a vast improvement over a bone stocker, and with a stick, it'll burp the tires any time, BUT

If 200 hp really is your goal, how far are you willing to go to get there?

As food for thought, go over to the HA/GR area, find my build thread ***led "a couple pictures/update" and read what I've done to my flathead six Mopar. I realize that an OHV is different than a flathead, but be prepared for the same kinds of battles.

After reading that stuff, consider this- My winter projects are to finish my backyard casting foundry and to build a flowbench. I WILL achieve 200 hp with my engine, but it will be full race, it will most likely have all proprietary parts, and it may not be on the second go-round.

good luck to ya!

 

Sorry to drag up an old thread. Came up on a Google search and I started reading.
Not sure if this ever got answered. If I missed some mention, apologies in advance.
In case it didn't get answered, the 292 was rated (net) at around 120-125HP and 215 Ft./Lbs. up thru '74.
In '75 the intake manifold was cast in as part of the head and I've heard the ports were redone.
The rating then changed to 140HP and 235 ft./lbs., where it remained until production stopped, which I believe was during the '86 model year.
I've heard of 292's bolted to T-5's before, not sure if an adapter was needed.


6narow

 

I did a 261 in my 53 Suburban, It was bored .060 over with "Ohio" flattop pistons, Patrick's biggest cam, aluminum timing gears "gear drive sound",848 head, Clifford water heated 4 bl manifold, Edelbrock 500 and a Saginaw 4 speed. Man did it sound good. but It was a dog for what I spent on it. I basically threw a bunch of parts together with no regards to what really worked best. It was a fun project. Got a picture somewhere.