Inliners International Forums General Discussion Engines What are these?

I just bought a 292 which date codes to 1968. I'm trying to verify that the head is original to the motor. The number on the head is 3927763.The charts I've looked at are sometimes conflicting. Also the are several "pipe plugs" directly above the ports. What are those "pipe plugs" for? Is this head compatible with a lump kit?
Thanks,
Len

Hi Len . . .

The Santucci book documents that head as a 292 casting number. Those pipe plugs are closing off smog ports. A belt driven air pump was fitted to add fresh are to exhaust stream to help the catalyst do its job.

regards,
stock49

PS. Now that I look again at the Santucci book it shows this head having been used on both 250 and 292 truck applications. Our old "late Chevy index" page suggests the same Late Chevrolet Inline 6 Cylinder head Index

Thanks for the info! I'll order a lump kit today.

Look for the photo in Leo's book of a head that Leo had made that is described as a sissal lump head for a turbo application. The lumps are in epoxy but its a lump head just the same. You will notice that that head has the smog ports. So a bolt in lump kit is going to work just fine. I currently own that head.


Finding plugs for those fittings can be a bit challenging. They are an odd size. What you can do is drill the inside of the fitting to a npt plug size, dont go all the way through, use a bottom tap and tap for npt threads, then install a hex npt plug with some high temp sealer. I had to fix that head that way because the plug was messed up when I got the head. So that is one approach to using that style head.

I Have that book and I will look. I believe 12 bolt Tom has those plugs.
Thanks,
Len

floaterboy I may have some of the plugs yet I also have the lump port kits. And I am pretty sure MrHotRod6 has the plugs as well along with my Lump port kits.

Larry, you are the t6 lump? I built another 292 head a couple of years ago and used the early t6 lumps in that head. I have not gotten around to building the rest of the motor but putting in the lumps was fun truth be told.

Larry is the originator of the teardrop style bolt-on lumps, and a stand up guy! Wish he and I had taken the opportunity to have taken a Kodak moment to mark the occassion when we met up last year in South Georgia.

mdonohue05

Yes I am and have been making them since the early/mid 90s, And I have been doing the L6s since about 84.

Well I totally enjoyed installing them. First head I ever did with bolt in lumps.

Mike

So you have not gotten it on a motor yet ?

I had started to build a 31 chevy roadster into an altered, much like dick bertollucci’s X-100, in the early to middle 90s. I loved the way that car looked. I ended up having to go back to school and change careers in 2000. So the project got put on hold. That was what I was going to put the 292 into.

In 2011, I had my choice, resurrect my high school car that I built in the late 70s and get the rust issues fixed and rebuild the thing, or finish the race car. I opted for my high school 57 chevy. Back in the early 90s I was the east coast chapter president. I ended up spending a lot of months in chemo in 92/93 but before that occurred, I want to say 90/91, a few of us inliners went to English town raceway for the old time races and ran our cars. There are photos of my 57 from that day in the 12 port news.

So I fixed all the structural rust that made the car unsafe to drive, mechanically rebuilt the rest of the 57, my boys would not let me change the paint or the 80s era crushed velour seat covers (hey, no laughing, they were the thing back then, lol), built a new 261 motor and off to the trifive nationals we went. I am generally the only 6 cylinder making fun runs down the track at those shows.

https://www.trifive.com/threads/dragsix.233595/

My youngest son wanted to build a 57. So one of my best friends sold him his first car from 78 and we are rebuilding that car. My boy wants a six cylinder so we are going to see if we can fit a 292 motor in his 57. The head I build with your lumps is going to go on his motor. I hope it’s not too much as I ported it out, big valves, installed the lumps. Going to have to change the valve springs because that head was destined for a much bigger cam.

If I can sort out a way to get the 292 in his car without butchering anything, I may do the same with my car and use the Sisal head on my car. If anyone has done this, a 292 in a 57 chevy, I would love, and be very grateful, to see how you built front motor mounts, and radiator and water pump location.

The roadster, I think I may resurrect that this year. Put a 292 in that car too, lol.