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Old 12-17-2017, 12:44 PM   #51
Nuckingfuts
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Re: Help Me Pick Some Heads For Christmas Present

Quote:
Originally Posted by chris mc bride View Post
Already running edelbrock stuff and their heads are pretty good.Have run them on few street rod builds. WIth 4.00 bore there is no reason to go bigger than 2.02 intake/1.60 exhaust.You can go bigger but will need some grinding to unshroud valves. Not sure what chamber options they have,but make sure it will work compression wise with pistons. 10 to 10.5:1 would be max IMO.

As for work to pickup flow.If they don't have 5 angle valvejob that would be my first move.Maybe port match and good to go. just my 2 cent.


Guess I should have read to end and could have saved the typing,oh well needed more practice anyway.LOL
I thought about some port work but these will be such an improvement over stock I'm going to hold off. Think I'll just disassemble and clean/inspect for now.
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Old 03-03-2018, 12:26 AM   #52
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Re: Help Me Pick Some Heads For Christmas Present

Needed to give this discussion an update since it's been a few months.

Over Christmas we got the engine/trans pulled and have had a chance to tare down the top end to take measurements and confirm our starting point before bolting on any new parts. The pulled motor stats are:

1. Verified a 4.00" bore x 3.48" stroke
2. Piston deck height of 0.032"
3. Head Gasket thickness of 0.039" compressed (scratching my head as to why the PO used such a thick head gasket)
4. Stock heads with 76cc chambers

Using a dial indicator to ensure TDC I am confident that my piston desk height is accurate but I'm confused about a few things I'm seeing and would like some feedback:

1. Since the mileage of this engine has been in question from the get-go (This is a 1973 truck and odometer says 21k miles which could be 121k, 221k, etc...) I'm looking for evidence of any level of rebuild. Though the bore is still at 4.00" I'm seeing markings on cylinder wall as if its been honed (see photos). Hone & re-ring????
2. Also the current pistons have 4 valve reliefs (see photos) which is excessive for these two-valve stock heads

Thoughts?

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Old 03-03-2018, 01:01 AM   #53
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Re: Help Me Pick Some Heads For Christmas Present

A 4 valve relief piston is the standard configuration. That way the pistons will fit either side of the engine. Those pistons look to be dished to me. A set of heads with 64cc chambers and a thinner head gasket would help.
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Old 03-03-2018, 01:57 AM   #54
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Re: Help Me Pick Some Heads For Christmas Present

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A 4 valve relief piston is the standard configuration. That way the pistons will fit either side of the engine. Those pistons look to be dished to me. A set of heads with 64cc chambers and a thinner head gasket would help.
Yep these are slightly dished. Not stock right?
I can post up a better pic but these pistons have approx 1/4" wide crown and a 0.065" dish to them.
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Old 03-03-2018, 11:41 PM   #55
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Re: Help Me Pick Some Heads For Christmas Present

Yes, dished pistons are stock. This is probably an 8:1 or less engine with those large chambered heads.

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Yep these are slightly dished. Not stock right?
I can post up a better pic but these pistons have approx 1/4" wide crown and a 0.065" dish to them.
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Old 03-04-2018, 12:18 AM   #56
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Re: Help Me Pick Some Heads For Christmas Present

Can anyone shed some light on if this looks like a stock piston for this gen I and 350?

This morning I was able to verify bore roundness/taper and though Im approaching 75% of allowable limits, I'm still within allowable tolerance. With that said, it doesn't really matter what the previous owner did. I know now that this block is down to its last ~50k miles and will run it as is (no rebuild) until it gives.

With a piston deck height of 0.032" I picked up a felpro 0.015" steel shim to drop the head into a respectable quench range. Should have the decks prep'd and heads on in the next couple days. I'll post pics as progress develops.
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Old 03-04-2018, 12:20 AM   #57
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Re: Help Me Pick Some Heads For Christmas Present

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Yes, dished pistons are stock. This is probably an 8:1 or less engine with those large chambered heads.
Cap'n, any idea on the volume of these pistons? I've read somewhere between 5-7cc.
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Old 03-04-2018, 12:48 AM   #58
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Re: Help Me Pick Some Heads For Christmas Present

looks like 423np

https://www.summitracing.com/parts/stl-423np
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Old 03-04-2018, 01:36 AM   #59
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Re: Help Me Pick Some Heads For Christmas Present

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Looks very much like it. In that case (and check my math) the piston would have a volume of 8.6cc

If that's the case, and I have the following inputs:

Bore 4.00
Stroke 3.48
Head chamber (new) 67cc
Valve reliefs 8.6cc
Gasket 0.015
Deck clearance 0.032

Then I get a SCR of 9.4 which is in the ballpark of what I'm shooting for with these new iron vortec heads. Am I overlooking anything?
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Old 03-04-2018, 11:00 AM   #60
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Re: Help Me Pick Some Heads For Christmas Present

are you entering the valve relief volume as a negative?

-8.6cc
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Old 03-04-2018, 09:59 PM   #61
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Re: Help Me Pick Some Heads For Christmas Present

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are you entering the valve relief volume as a negative?

-8.6cc
On the calculators that call for it.
I'm using Performance Trends CR calculator.
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Old 03-04-2018, 11:58 PM   #62
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Re: Help Me Pick Some Heads For Christmas Present

A dish in a piston should be a positive number. A domed piston's dome volume would be a negative.

Quote:
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are you entering the valve relief volume as a negative?

-8.6cc
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Old 03-10-2018, 02:22 AM   #63
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Re: Help Me Pick Some Heads For Christmas Present

Update!
Finally making some progress after a long week. Heads are torqued down, manifold mocked up, and rockers going in tomorrow. Waiting on a few parts from Mr. brown but should be ready to put the motor back in shortly.

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Old 03-10-2018, 06:06 PM   #64
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Re: Help Me Pick Some Heads For Christmas Present

Nice!
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Old 03-11-2018, 12:05 AM   #65
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Re: Help Me Pick Some Heads For Christmas Present

Looking good
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Old 03-19-2018, 09:29 PM   #66
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With such a nice engine. Please post a pic of the truck that you are going to put this engine in. Did you indicate a 1973 pickup ? Show us some pics. Thanks !!!!!
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Old 03-21-2018, 04:02 PM   #67
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Re: Help Me Pick Some Heads For Christmas Present

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With such a nice engine. Please post a pic of the truck that you are going to put this engine in. Did you indicate a 1973 pickup ? Show us some pics. Thanks !!!!!
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We're pushing to get the laundry list of things done and motor back in by this time next month so I'll post wrap up pics then.
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Old 03-23-2018, 06:32 PM   #68
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Re: Help Me Pick Some Heads For Christmas Present

Since we used VHT ceramic paints I need it to bake the coatings to improve the cohesive strength but we don't have a big enough oven to throw the parts into so we had to improvise. Had to go build our own redneck ez-bake oven:laughing

Grabbed a double-walled cardboard box that I could fit right over the engine stand, pulled out my weed burner (no not that weed burner) and went to town.

Was able to heat cycle everything up to 200, cool, then back up to 250F without burning the house down.

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Old 03-23-2018, 06:33 PM   #69
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Re: Help Me Pick Some Heads For Christmas Present

Figured I'd try and push the limits of this easy bake oven so I set it up on the back patio to cook the headers at as close to 400F as I could. Though cardboard self ignites just north of 450F I wasn't sure how the adhesive would hold up. Let's just say that $h!t got real right at 400 so I held it at 390F for 30 min. At this temp i could bake my own powder coat, Not bad!
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Old 03-27-2018, 07:45 AM   #70
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Re: Help Me Pick Some Heads For Christmas Present

Are you upgrading the transmission as well since you already have the engine out of the 1973 pickup ?
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Old 04-30-2018, 02:29 PM   #71
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Re: Help Me Pick Some Heads For Christmas Present

Here's a couple of wrap up pics of the truck now that the heads are on and everything is back together. Thanks again for everyone's help on this project!!

So much prep and paint that my fingers are literally bleeding and my back feels like Im 100 yrs old.
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Wiring cleaned up, carb and timing are dialed and the jewel is ready for the lid.
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Couple of shots from this weekend's car show. This was his first show with his truck which was held at his high school.
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Old 04-30-2018, 11:05 PM   #72
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Re: Help Me Pick Some Heads For Christmas Present

That looks great nice job.
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Old 05-01-2018, 12:04 PM   #73
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Re: Help Me Pick Some Heads For Christmas Present

Very nice!

-klb
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Old 05-01-2018, 09:25 PM   #74
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Re: Help Me Pick Some Heads For Christmas Present

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That looks great nice job.
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Very nice!

-klb
Thank you, and Thanks again for the help Cap'n!
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