Tricked-out Chevy six cylinder engines

[JR25]

Originally Posted by sixtyeightchevykid

i have a question for anyone running an offenhauser intake and using engine coolant to heat the intake. when i ordered my headers from tom langdon he told me that the freeze plugs in the bottom of the intake will leak and he has a write up on how to make sure it doesn't leak, has any one had this issue? how long will it take before it leaks? and what did you do to fix it?



here is a link to toms write up on this issue.. http://stoveboltengineco.com/2012/02...let-manifolds/

I talked to Tom, read his write ups, talked to Patrick (Patrick's Antique cars and trucks), read several "tech" articles, and dozens of threads on this topic. I chose to go with exhaust heat to the manifold for two reasons: the original used exhaust heat, and it was a much cleaner look to achieve without worrying about a coolant leak!
Some guys don't heat it at all (normally in warmer climates than Tom is in up North) and report NO problems at all. Tom is a very smart guy, and VERY adamate about this topic, but in the end, the decision is yours! When I fired my engine for the very first time, it was only minutes before the copper tubing that I used started the dark rainbow coloring from the heat, so I know for a fact that the intake is getting hot quick, no waiting on the coolant to warm up!
Have you already plumbed it up? If so, my rambling did you no good, and I didnt even answer your question!
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[Twisted6]

Originally Posted by sixtyeightchevykid

i have a question for anyone running an offenhauser intake and using engine coolant to heat the intake. when i ordered my headers from tom langdon he told me that the freeze plugs in the bottom of the intake will leak and he has a write up on how to make sure it doesn't leak, has any one had this issue? how long will it take before it leaks? and what did you do to fix it?



here is a link to toms write up on this issue.. http://stoveboltengineco.com/2012/02...let-manifolds/

Normally when it becomes under pressure it will start to leak. Some guys have just ruffed it up along with the intake and just JB weld them in.

[mr andrerson]

wow!! JR25... i just saw your mill...thats one sweet 6!! i hope you put a vid up of it running!!

[65chev]

When I first installed the motor I had a bad bog off the line. Installed the hot water lines and it went away!!! Offenhauser manifold and Holley 390 carb. Mike
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[JR25]

Originally Posted by mr andrerson

wow!! JR25... i just saw your mill...thats one sweet 6!! i hope you put a vid up of it running!!

Gotta get a drive shaft this week so the exhaust can be run. A friend of mine owns a muffler shop, so he will do that work! Gonna just run straight pipes for now and worry about mufflers later when it actually gets on the road. When I get the exhaust in, I will try a video. Still running high rpms to break in the ole flat tappet cam, and heat has been an issue as well! Apparently, boring 80 over heats the block up a little high for the original copper radiator. Probably looking at having to buy a high efficiency radiator!

These things are a money pit!!!
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[JR25]

Originally Posted by mr andrerson

wow!! JR25... i just saw your mill...thats one sweet 6!! i hope you put a vid up of it running!!

Ok..... As requested. Had to upload it to youtube to link it!

http://www.youtube.com/watch?v=ayjSzE9DRM4

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[Vernski]

Cool video JR engine sounds healthy..Vernski

[JR25]

Originally Posted by Vernski

Cool video JR engine sounds healthy..Vernski

Thanks Vernski! This was my first engine build, so Im happy with it so far!
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[TJ's Chevy]

Originally Posted by JR25

Thanks Vernski! This was my first engine build, so Im happy with it so far!
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What Vernski said! Sound awesome!

[sixtyeightchevykid]

i have the offy intake ont the truck now but i do not have the headers or the water heat installed yet. the offenhauser intake i got was brand new never installed still had the tag and wrapping on it, the guy bought it from jc whitney 10 or 12 years ago. he sold the intake and 6 qjets to me for 100 bucks. thats a hard one to pass up.

[The Rocknrod]

This is my old GMC. I'm thinking of a new build to include a newer model very soon.

[TJ's Chevy]

Originally Posted by The Rocknrod

This is my old GMC. I'm thinking of a new build to include a newer model very soon.

Very Nice! Great work! Is that a 228?

[awbrown]

To say that you have to have the manifold heated is like saying a tunnel ram or an air gap manifold won't work ... my triple setup on my 261 has no heat and I am sure that if I dont run it in the winter i will be fine .. If you drive yours all year in a cold climate , then I would for sure heat the manifold...

[The Rocknrod]

Originally Posted by T.J. MCCAULEY

Very Nice! Great work! Is that a 228?

54 - 235c.i.

[Twisted6]

Well the dist. has the DUI stuff 50,000 coil and mod. If I remember right 8m. wires and it has been set-up using a dist. machine to handle the 8000.That intake was first on my old 250 built up with a crane cam 38-7200 power band beefier springs then what crane called for. Pistons started life as a 12.5-1 for a 307.They were fly cut .225 to clear the 583/607 lift cam which turned the pop-up in too a 3staged piston dome. Stock rods with ARP studs,
bottom end is other wise stock. Stock oil pump. The head on the main build was a 194 which put the more between 13.9-1 an 15-1. The head gasket would only hold up to about 3, 1/4mi passes before blowing it. So to be able to run a 3day weekend event I swap to a larger head to bring the compression down to around 11-12-1. And yes this is just a stock cast iron head. And at that time had no lump ports.
This new motor is now at 13-1 with a New cam which is just under 700 lift. which also had (key word being had) my first style bolt-in , which has now been replaced with My newer
G2 lump kit. The same tunnel ram will be used till I finish my newer Alum 3x4 one with other improvements to it.

On that older motor which was just over 17yrs old. When I was testing different intakes
Offey 4b, Clifford 4b, and dual 4b. My 3x4 out ran and performed the best. and the ETs showed that.
And yes they are holley 450s Pretty much stock out of the Box. And I am now also working on a billet air cleaner for it. Or at least a better looking one kinda maybe old school but none the less it will still be of billet.

[TJ's Chevy]

Thanks for the info Larry. For the intake and headers what is a good gasket to use? Is the one Clifford gave me sufficient? I have an exhaust leak and no doubt a small intake leak and its because I am using a stock type gasket( The metal style).

[Twisted6]

I run the felpro 1025 head gasket and the MrGasket gasket and I have not had any problems and I have ran the Mrgasket for 20 some yrs. I heard the felPro gasket is vary good as well.

[KroAutomotiveInc]

found this video it has some really nice sound quality of a dual exhaust straight 6 running.

1955 GMC-250 six with Purple Horneys - YouTube

[TJ's Chevy]

Originally Posted by KroAutomotiveInc

found this video it has some really nice sound quality of a dual exhaust straight 6 running.

1955 GMC-250 six with Purple Horneys - YouTube

Yup, I've seen this one before.

[TJ's Chevy]

Here's a video of my 64 292 running after 13 years.

http://www.youtube.com/watch?v=PwwAN402CXo

Sorry about my fingers getting in the way. I was afraid to rev it up to high cause I didn't want to blow the bent pushrod.

[Twisted6]

X2 keep us up-dated.

[Vernski]

Originally Posted by Twisted6

X2 keep us up-dated.

Hey Larry if you have some pic's of your builds or build please post them and any tricks or mods you've done. The new guys and even us old timers enjoy eye candy..Vernski

[67swb72klb]

one I snaped a pic of at a local show

[TJ's Chevy]

Originally Posted by 67swb72klb

one I snaped a pic of at a local show

Awesome! Wish mine was just like it!

[TJ's Chevy]

Here's a video of mine running.

http://www.youtube.com/watch?v=0H6MOkFshSU