Trick flow Double Hump alloy heads
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Trick flow Double Hump alloy heads
Received one of these from Summit today.
Took some measurements today hopefully flow test over the weekend,these heads are going on my weekend cruiser so not going overboard.
450 hp 383 sbc,turbo 350 with 4200 9" converter 3.7:1 rear gear.
Just wanted to share some information.
The couple of things I have found so far-
Guides are tight
Pinch is very small 1.68 " CSA includes radius
Would take some work to fit 3/8" pushrods I will run 5/16"
The casting, valve job and chamber seem good,
I blued and back- blued seat and looks good.
With the 60cc chamber the 37deg top cut is very close to the deck,I want change top cut to 40deg and test.
Intake throat is 1.79" - 88% of 2.02" valve
Exhaust throat is 1.38 " - 86% of a 1.6 " valve.
Intake bowl is 1.90" - 94% of 2.02 " valve
Exhaust bowl is 1.53" - 96% of a 1.6" valve
Will put up flow numbers and velocity profile in a couple of days.
Took some measurements today hopefully flow test over the weekend,these heads are going on my weekend cruiser so not going overboard.
450 hp 383 sbc,turbo 350 with 4200 9" converter 3.7:1 rear gear.
Just wanted to share some information.
The couple of things I have found so far-
Guides are tight
Pinch is very small 1.68 " CSA includes radius
Would take some work to fit 3/8" pushrods I will run 5/16"
The casting, valve job and chamber seem good,
I blued and back- blued seat and looks good.
With the 60cc chamber the 37deg top cut is very close to the deck,I want change top cut to 40deg and test.
Intake throat is 1.79" - 88% of 2.02" valve
Exhaust throat is 1.38 " - 86% of a 1.6 " valve.
Intake bowl is 1.90" - 94% of 2.02 " valve
Exhaust bowl is 1.53" - 96% of a 1.6" valve
Will put up flow numbers and velocity profile in a couple of days.
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steve c
"Pretty don't make power"
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Re: Trick flow Double Hump alloy heads
The Intake throat is 94%!!!
I would without hesitation step up to a 2.05" Intake valve , recut the seats to get the 45 degree Seat OD out to 2.040" and I would make use of that 1 CC or so larger Intake valve to unshroud the chamber if your not fighting for compression.
You only need 240 cfm to attain your 450 hp.
That deck finish looks great!
I would without hesitation step up to a 2.05" Intake valve , recut the seats to get the 45 degree Seat OD out to 2.040" and I would make use of that 1 CC or so larger Intake valve to unshroud the chamber if your not fighting for compression.
You only need 240 cfm to attain your 450 hp.
That deck finish looks great!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Re: Trick flow Double Hump alloy heads
A quick question, a little off topic though.
How will you manage your compression ratio? I'm guessing a heavily dished piston?
Kevin
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Re: Trick flow Double Hump alloy heads
Magmag2555 wrote: ↑Fri Oct 01, 2021 6:30 am The Intake throat is 94%!!!
I would without hesitation step up to a 2.05" Intake valve , recut the seats to get the 45 degree Seat OD out to 2.040" and I would make use of that 1 CC or so larger Intake valve to unshroud the chamber if your not fighting for compression.
You only need 240 cfm to attain your 450 hp.
That deck finish looks great!
Throat is 88%
Bowl is 94%
steve c
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Re: Trick flow Double Hump alloy heads
Kevin
At a guess it will around 11.5:1
I personally don't have a issue with that with our 98 fuel.
My other 010 383 with my dart 182cc cast iron heads with 0.028" piston to head,64 cc chamber pumps 225 psi cranking compression
Pumpgas runs 11.10s at 120mph at 3650 pounds streeter.
Alot of guys take issue with pumpgas and a bit of compression, I dont
steve c
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Re: Trick flow Double Hump alloy heads
Picking up a new GM 350 block today.
This is a 1975 HJ Holden 4 door sedan.factory colours.
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steve c
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Re: Trick flow Double Hump alloy heads
And since Holden closed its doors in 2017 a car like that is fetching up to AUD$60,000.
Interested to see what these heads do on a 383.
I’m a Street/Strip guy..... like to think outside the quadrilateral parallelogram.
Re: Trick flow Double Hump alloy heads
That little car is friggin cool. I will be watching this thread to see how your project turns out. Great work so far.steve cowan wrote: ↑Fri Oct 01, 2021 4:22 pm 20210912_083744.jpg20210912_083731.jpg20210911_182906.jpg20210907_173734.jpg
Currently a straight 6 cylinder but upgrades coming.
Picking up a new GM 350 block today.
This is a 1975 HJ Holden 4 door sedan.factory colours.
Re: Trick flow Double Hump alloy heads
The two door version is also a great looking car. In my opinion, it has a better shape/style than the US GM A bodies of 1968 to ~1972.
Re: Trick flow Double Hump alloy heads
GM Holden engineers designed some awesome cars in their day for sure
3370lb Sedan 9.89@136MPH 358chevN/A
Re: Trick flow Double Hump alloy heads
I have a feeling that head is going to port out quite nicely. Anyone know how those heads compare to AFR's Enforcer?
Re: Trick flow Double Hump alloy heads
Steve
Be really interested in the capabilities of this casting
Would be cool if it could flow in the 290s and make 600* Hp
And be made to look original
Be really interested in the capabilities of this casting
Would be cool if it could flow in the 290s and make 600* Hp
And be made to look original
3370lb Sedan 9.89@136MPH 358chevN/A
Re: Trick flow Double Hump alloy heads
Thanks for that Steve.steve cowan wrote: ↑Fri Oct 01, 2021 4:15 pmKevin
At a guess it will around 11.5:1
I personally don't have a issue with that with our 98 fuel.
My other 010 383 with my dart 182cc cast iron heads with 0.028" piston to head,64 cc chamber pumps 225 psi cranking compression
Pumpgas runs 11.10s at 120mph at 3650 pounds streeter.
Alot of guys take issue with pumpgas and a bit of compression, I dont
Your "other" 383 appears to be similar to the long (long) awaited project I'm plodding through. (On a historical note, I actually started back working on the car just yesterday so it begins...)
Do you have a thread somewhere as to what went into the other engine? (.028" PTH?)
It seems a 383 and small(ish) iron heads are part of my plan too.
I apologize if I've asked that before. It's been a long time.
Kevin