Peanut Port Drag Test
 

For several years I've been building 9.2 compression 467s with 236 peanut port heads, these engines use a 228/238/114 hyd flat tappet cam with a performer RPM intake typical HP was about 517-518 corrected HP, with about 560 TQ. Finally it looks like I will get to test one in my 68 Chevelle, 3720 pounds at a 2130 foot track. My goal is a high 6 sec pass in the 1/8 mile. Some pictures of the build.

Re: Peanut Port Drag Test
 

That's cool. I always considered "Peanut Port" heads as No Good. How much RPM were obtained with those figures.

Those heads only came on "truck" motors, right? Could not build a traditional stocker motor because they never came in a passenger car, correct?

Will Lamprect
i/SA 65 Impala in progress. 396/935 "Oval Port"

Re: Peanut Port Drag Test
 

90-92 SS Chevy pickup.
I don't know what the heads look like.

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There is some passenger car combinations legal with these heads. The cam is 228/238 @ .050, very mild, I did run it to 6400 RPM on the dyno, my peak power was around 6100 RPM.

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HP, Do you know year and model Chevrolet came with these 454 "peanut Ports"
Right know i am checking Class Racer Info Guide.
Will Lamprecht

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I've been told a 1975 Chevelle is legal, not sure it came that way though.

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73-75 are allowed the 236 peanut, 90 454ss truck uses the 360 peanut, 91-92 uses the 148, even smaller peanut port. Seems to be plenty of SS/GT 454's using the 236.

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I remember hearing that Lingenfelter ran a killer peanut port combination in SS back in the day.

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1975 Chevy Bel Air, Impala, Caprice, Station Wagon, Monte Carlo, Malibu, El Camino.

1976 Chevy Impala, Caprice, Station Wagon.

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Ready to race.

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Looks good,, let us know how it goes. Whats the rest of the combo?
Danny Durham

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Thanks, 68 Chevelle, T 350, 12 bolt 4.56 gear, 30x9 Hoosier, 3500-3720 depending on ballast, 2 inch header.

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I know very little about factory stuff, and less about big block factory stuff. I have an engine on the stand in the shop out of an 80's 3/4 ton truck that will eventually find a home in my wife's 55' F100 (don't start....i know). Just a street truck. How do you identify the factory heads? What's good and what is worthless?

Re: Peanut Port Drag Test
 

We raced Friday afternoon, Sat rain, Sun rain, so I really never got to dial the car in, I had a stumble on the launch which killed my 60-330, DA was 3253 on the best run, baro 27.80s. Never got to weigh the car because NHRA tech was to lazy to open the scale for me. The car hooked just fine but there was a stumble on the hit which I figured I had two more days to tune out but it rained both days. Timing was 35.5. Theres more there, just need more runs.

Runs in order:

1st pass, shut off 700 feet 660 6.746 1320 11.381 86.41 MPH
2nd pass shut off 1000 feet 660 6.719 1320 10.848 103.70 MPH
3rd pass run through though the 1320 on the rev limiter 660 6.726 1320 10.683 122.47 MPH

https://youtu.be/Vzp_ihehkUY
Car number 5252

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Not a bad start,, could hear the stumble, but sounded good on the gear changes. Maybe a squirter change is needed,, you've been around enough of them to figure out what it wants. Pretty good numbers, considering the moderate cam you're using. Seems like a little vibration going on there in the top end, but overall a good outing. I agree,, more laps will bring better numbers. Thanks for sharing.
We're in the process of sorting out my son's '69 Nova,,, like you, good numbers so far, with more to come. You can check it out on youtube also. Type in: Aaron Durham Nova. Take care.
Danny Durham

Re: Peanut Port Drag Test
 

HP the car sounds and runs good. I have a couple questions about the cylinder heads.
What drew you to this style head? Vs a 049 style oval port?
Did you have to replace the exhaust seats? Hardened?
How much do you think you increased the volume when finished?
Did you have to fill the intake manifold to match, or was it close?
Do you think there would be any problem using this style head or the 90's version on a tow truck 496CI combination, and if so what cam and intake?

Last is that Scott Welborns old car?

Thank you and keep up the great work it really looks good.

Re: Peanut Port Drag Test
 

1.What drew you to this style head?
I was running out of 781 and 049 castings in my engine building buisiness.

2.Did you have to replace the exhaust seats?
No, on muscle car builds I do not replace seats, but I'am a fanatic on round strait properly sized and finished valve guides which lets me make a very concentric seat with a extremely nice contact patch that transfers heat good due to the valve setting down on the seat perfect every time. Tow applications get a 1.750 CHE exhaust seat.

3.How much do you think you increased the volume when finished?
I don't know I didn't check it, I machined, built, dyno tested, installed it in 7 days.

4. Did you have to fill the intake manifold to match, or was it close?
No, I smoothed the plenum divider, the intake is not the cork.

5. I have built tow engines close to this, this engine would be good in my dualie, except the 9.3 comp would worry me along with the 1.880 exhaust valve size. I will put a link up to my 489 tow build along with a picture.
http://speedtalk.com/forum/viewtopic...447590#p447590

6. Last is that Scott Welborns old car?
Yes, I bought it from Dale Hulquist the BSer, when it arrived I realized it would need a total rebuild from front to back, and thats what it got.

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HP thank you for the info. Speaking of the tow truck combination. Why would you use a different exhaust valve? Heat? Then what C.R. would you use for a truck? Lastly, do you know what other engines/trucks come with peanut style heads? 1990's? 80's etc? Sorry if I struck a cord about your car, it does look and run good.

Robert

Re: Peanut Port Drag Test
 

In the link above the comp was 8.25 and the reason for that is to protect myself and the customer, he was pulling 20,000 plus pounds. I wouldn't want a 1.900 seat put in a production BBC head I was towing with because I wouldn't want to get that thin in that area, thats why I use a 1.720 valve. If you would read the link, you will see power was 550 HP with 600 TQ. No need to apologize about the car, its no problem for me.


http://speedtalk.com/forum/viewtopic...447590#p447590

Re: Peanut Port Drag Test
 

HP thank you for the info. I did read the article in the link. But, I did see where there was possiably more info to the story (picts and all) that I did not have access to until I register. I have just not done that yet. But, thank you for the info. Again your car looks and runs really good. Have a good one.

Robert

Re: Peanut Port Drag Test
 

Update: I ran the car at Bandimere in some 8800 DA conditions, 24.24 baro. I was able to figure out the off idle stumble and was able to run a 1.47 60, 6.95 660, 11.05 1320 on Sunday, If I could have figured out the carb Saturday when the baro was a whole 24.38 and had my 29.5s on there surely I would have seen some 10s.

Re: Peanut Port Drag Test
 

HP how would it have compared if you ran the next bigger cam 238/248 114?

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I had 9.3 compression, I think it would be slower, but I don't know.

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Update,


I had the peanut port out this weekend at Pueblo, 25.10 baro, 7000 DA, made suspension adjustments, along with 29.5 Hoosiers and ran the following

60 1.42
330 4.35
660 6.82
660 98.8
1320 10.86
1320 120.4

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I'm really impressed your horsepower and weight make that seem like a 11.20 combo not a high to mid 10 second combo. someone knows how to build a efficient car that works. nice job

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Great runs. Pretty impressive.

Have you ever done any work with the 366 truck motor? I know it is a high deck block, but we noticed it has smaller Main Journal size 2.50 like a 409 motor.

Does anybody know if this motor listed in the NHRA guide? Probaly not since it only came in dump truck/buses.

Will

Re: Peanut Port Drag Test
 

HP is this the same engine combo with no changes as last year? Also if you had to make changes would you use a cam with a tighter lobe sep. ? What icl is the present one in at?What if you wanted to make more upper hp but not kill the bottom to increase the back half.Seems like you are running as fast as some alum. head roller cam more comp. engines.How about some thoughts on this.Most builders would cringe at a 114 ls.

Re: Peanut Port Drag Test
 

It is the same combination as last year, just dialed in now, low 10s. The cam was used to keep the engine as close to what I sell as possible, the cam has great vacuum and works great in a street driver. There is better cam choices when it comes to the track for sure. I feel I've maxed the combo out and its time to move on to my 620 HP oval port combo, I think you will like that cam, 108 LC, peaks @ 6600 RPM, the peanut port peaked @ 5900, although it ran through @ 6900 RPM. Stay tuned....

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It ran 10.80s at 7000 da is this corrected or what would you expect at 2000 da

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366 has same main journal size as other BBC don't know of many ever doing anything much with them,had a friend ran them years ago in Super stock 4wd pulling,they had 366'' limit,they made the rules don't guess they thought of anyone building 366'' BBC, he dominated it.
About all we have ever done besides build them back stock, is use the cranks,in 396,427's and use the rods for stock rebuilds.
366 wouldn't be good for any kind of budget build,by the time you had custom pistons made that would be more than the difference in $ of 454/427 block,could build bigger for same or less money.

HP,I like your build.

Mike Taylor 3601

Re: Peanut Port Drag Test
 

I think that would depend on the barometer that the 2000 DA happened at.
Example: 2000 DA with a baro of 28.00
2000 DA with a baro of 29.40
Obviously the 2000 DA with the 29.40 baro WILL be faster than a 2000 DA with a 28.00 baro in my opinion. So to answer your question, I would say 10.40s in a 2000 DA.

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Thanks for the nice comment!

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Why would you buy it ?

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After a front to back rebuild I've won several races with it, run incredibly fast with a production block/head combination, I love this car.......that's why

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👍 x2

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That answer deserves a bigger picture. :)




http://classracer.com/classforum/att...9&d=1519358433

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Nice lookin' and runnin' car.

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It ran fast as stocker long before you rebuilt it.

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Thanks

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Did it run low 9s @ Kearney's 2130 feet elevation with 1.3 60s on the rear tires?