My 67 Chevelle 300

[Junk Whisperer]

Re: My 67 Chevelle 300

I'm likeing the "Lump-Ported" Head,was a Sissell's peice,Pete 8)? ~J/W-OO6.

[KeithTurk]

Re: My 67 Chevelle 300

Pete... this build rocks...

So this is your first engine too?

VERY COOL...

K

[cantvalve16]

Re: My 67 Chevelle 300

I very much appreciate that you are sticking with the six. Cool stuff and definitely different for a Chevelle.

[Bamfster]

Re: My 67 Chevelle 300

I totally dig this build! That is a super clean chevelle....nice score

[milner351]

Re: My 67 Chevelle 300

That head is righteous! :o

I can't afford that kind of headwork on the 292 in the '54.

I'm just putting in larger stainless valves and screw in studs, I'll do a bit of grinding in the ports but mostly just a gasket match and a bit of bowl cleanup work. I went with the Langdon's split exhaust manifolds and his "marine" cam. I'm saving up for natural gas pistons to get into the mid 9 compression ratio range.

How much material will be taken off the block to "zero deck" the pistons? Are you going with new pistons? overbore?

Love this build!

[DanStokes]

Re: My 67 Chevelle 300

I super pleased that you were able to get your head together (as we used to say in my Hippie-Dippie days). Who's doing it? JW - there are several folks who do these heads, including Sissel (Kay Sissel (deceased but the shop is still in business) developed the technique), Performance Engine Service (the source for my head - Clyde Norwood is retired now), T6 Racing in Florida, a guy in Oklahoma that I don't have much info on, and I think some others. I understand that there are minor differences in output but all heads using this technology are supposed to work well.

A guy here in Wilmington that I recently hooked up with has built MANY of these and he says he'll work with me on my next motor. He starts with (wait for this) - - - 15:1 compression! Takes the right rods, pistons, etc, but surprisingly a stock but detailed crank is OK.

Not sure how much you have to deck the block for zero piston height, so I'm eager to hear the answer.

Great Project
Dan

[67pete300]

Re: My 67 Chevelle 300

Thanks for the kind words. It's been going really slow because I don't get to spend enough time or money on it as I'd like with a new house, two young kids, a mostly understanding wife and a military career. Until now I've just been fooling around with a $100 craigslist engine. But now I'm committing serious money so we'll have to see it through.

I wanted to go with flat-top 307 (same 3.875 bore as a 230/250/292) pistons, but they are not easy to come by, and caused a significant increase in price once you deviate from the standard engine rebuild kit with stock style (dished) pistons. So I am going with the stock type pistons (0.040 over) to save some money. They are advertised as nominally 8.2:1, but the 230/250/292 head combustion chambers vary in size (from what I understand.) I am hoping to get about 8.8:1 with the dished pistons, zero deck on the block, and some milling of the head. I'm not sure how much has to come off the block, I didn't measure before I removed the pistons.

What I am saving in pistons, I am spending three times over on the head. It is a "new" piece (ie not a Sissel or old school head.) There is a guy making them (he sends them to his shop for the machining, and then assembles the valvetrain, installs the lumps, and does his own handwork in the bowl area) I found on other message boards. I can PM details anyone seriously interested. I figured the money spent here would really leverage the intake and exhaust upgrades and will make a huge difference. Plus the head will handle anything else I want to do down the road if I get more ambitious.

[Bamfster]

Re: My 67 Chevelle 300

It seems to me that you could mill the head easier and with fewer problems than a V8 to bump CR. I have zero knowledge about I6s though so......

[DanStokes]

Re: My 67 Chevelle 300

My head is cut 0.070 which is at the raggedy edge of all you should do. It was cut 0.060 when originally built and Steve Norwood (the builder) had to cut another 0.010 to flatten it when I took my used head in for a freshening. They'll crack if cut too far, but there are stories of guys cutting them as much as 0.125 - seems like a bad plan to me.

Cool that you found a guy do do the head. Looks like a good piece. Keep us posted!!

Dan

[67pete300]

Re: My 67 Chevelle 300

Still nothing in the garage yet, but it is coming together...

Dropped this off at the machine shop yesterday.



There I sighted the bare block with machining done. New pistons are installed on the old rods (all cleaned up.) Should be going all together this week.

This is being shipped to me on Thursday:







Also left my ebay intake to get bead blasted:

[Scott Liggett]

Re: My 67 Chevelle 300

TOYS!!!!

[milner351]

Re: My 67 Chevelle 300

SUWEET!
which carb are you going with?

[67pete300]

Re: My 67 Chevelle 300

I've been trying unsuccessfully so far to get a deal on an Edelbrock 1403/4 500cfm on ebay.

[milner351]

Re: My 67 Chevelle 300

did you post the specs on your cam?

as I think you already know I ended up going with the marine spec cam for the 292 - basically the 200hp spec cam when these things were being marinized for mercruiser and pcm. Should pull like a tow truck.

I'm still not sure what I'm doing for a carb.... time will tell. Still have to pick up the long block (Seth may get it on his way back from Maxton this time) then go from there.

Keep us posted - that head looks impressive! - do you know what your compression ratio will be?

[DanStokes]

Re: My 67 Chevelle 300

Looks great, Pete! Hope your tune problems are nothing like mine! My lumps fit a bit tighter but I don't know if that matters. Pretty sure you could JB Weld the gaps, but there may not be anything to gain by doing that. Are the lumps from Argentina? They look a little different from mine (PES) and from the T6 ones I've seen pics of.

Dan