Peanut Port Drag Test

[HP HUNTER]

Originally Posted by Robert Simpson

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?

Thanks for your interest.

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

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.

[Robert Simpson]

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

[HP HUNTER]

Originally Posted by Robert Simpson

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

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

[Robert Simpson]

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

[HP HUNTER]

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.

[jcw31]

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

[HP HUNTER]

Originally Posted by jcw31

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

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

[Jim Hanig]

Originally Posted by HP HUNTER

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.

Why would you buy it ?

[HP HUNTER]

Originally Posted by Jim Hanig

Why would you buy it ?

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

[Dwight Southerland]

Originally Posted by HP HUNTER

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

👍 x2