|
02-22-2018, 01:42 PM | #21 |
VIP Member
Join Date: Jul 2007
Posts: 1,334
Likes: 914
Liked 727 Times in 152 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
When your done they will pour the same volume. Pass tech, have a great race. That’s why they are welded up. To adjust the runner volume. They will be legal to the inspector.
__________________
Todd Hoven 1035 Stock |
02-22-2018, 02:11 PM | #22 | |
Member
Join Date: Dec 2006
Location: Charlevoix, MI
Posts: 426
Likes: 96
Liked 98 Times in 36 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
Quote:
Correct me if I'm wrong but I believe welding and epoxy are illegal in stock, so if you do that to get the cc numbers right aren't you illegal?
__________________
Bobby Lundholm 3516 G/SA |
|
02-22-2018, 02:30 PM | #23 |
VIP Member
Join Date: Jul 2007
Posts: 1,334
Likes: 914
Liked 727 Times in 152 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
Sounds like a mystery. The first guy who passes a tech inspection via tear down with these heads, will know the secret. Who ever prepares those heads would get my business if I had a Chevrolet. There are no replacement heads for my combo nor ever will be. I was told “it’s not in the spirit of stock eleminator” There was my answer. This deal is a goldmine for power. I’d work on a set until it passes, and not ask questions on a public forum about it during or after. I don’t have those problems so it
Doesn’t apply to me. QUOTE=Bobby Lundholm;556815]My point is that they originally start at 185 cc and finesse them down to 165 cc where the stock ones are NHRA will know they have been modified thus being illegal. We are not talking about removing material and making it look "stock" adding material is whole different ball game. You never miss what you don't know was there, but when runners are smaller than what the manufacturer is saying it makes you think. Correct me if I'm wrong but I believe welding and epoxy are illegal in stock, so if you do that to get the cc numbers right aren't you illegal?[/QUOTE]
__________________
Todd Hoven 1035 Stock |
02-22-2018, 02:38 PM | #24 |
Junior Member
Join Date: Jul 2012
Location: Muskegon, Michigan
Posts: 57
Likes: 0
Liked 4 Times in 1 Post
|
Re: Thoughts on accepted aftermarket heads for 350?
Wouldn't it be easier for everyone, if NHRA just calls it: Every SBC head must be Less than or equal to 185CC's, have stock diameter valves? Then they just inspect for grinding and pour? We all make a ton of power, and inspection is easy. (FYI, the pinch cross section on the Dart 185cc heads are smaller than the stock intake manifold cross section) Thus, the heads will be a substantial gain once a good valve job and flowing is completed.
|
02-22-2018, 03:04 PM | #25 |
VIP Member
Join Date: Apr 2002
Location: Coarsegold, CA
Posts: 1,017
Likes: 57
Liked 321 Times in 101 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
All I can say is
WTF IS NHRA THINKING.... Maybe they figure that between these BS heads, crate motors and eliminating Heads-Up runs we will all just walk away????? I have been asking for 15 years what is their Business Plan.... Maybe this is it??? and another thing.. Anybody that knows anything about air flow or a flow bench isn't posting and never will....
__________________
Bob Mulry 7516 STK A & M Motorsports Last edited by Bob Mulry; 02-22-2018 at 03:17 PM. |
02-22-2018, 03:29 PM | #26 | |
Senior Member
Join Date: Dec 2003
Location: Vacaville Ca
Posts: 809
Likes: 782
Liked 648 Times in 269 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
Quote:
Hey BG! Eliminate heads up? Need a really good explanation ... Are we not a Performance based class? Combine Auto and Stick? Stick will run away with it. You might think an auto is as fast but a good stick will kick your a $ $. If.... one does not have the negative paper factor in favor. Have they decided to do away with the Alum Head penalty for all? Appears the Gov irrigation flow gate is wide open. Crate motor combos. No- period.
__________________
Barry Polley 758 A/SA California Screaming! California- No place to race! |
|
02-22-2018, 03:57 PM | #27 | |
VIP Member
Join Date: Apr 2002
Location: Coarsegold, CA
Posts: 1,017
Likes: 57
Liked 321 Times in 101 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
Quote:
All you have to do is look at what the flakes from the IHRA are posting on line..... They don't even look at wheel studs anymore.... With tech the way it is how far can no heads up be?????? The only thing that could be done is to protest the car, but on the other hand will the NHRA have their people in place to do the inspections???? If and when it happens I'll find something else to do after doing it for 55 years.......
__________________
Bob Mulry 7516 STK A & M Motorsports |
|
02-22-2018, 04:35 PM | #28 |
Member
Join Date: Sep 2006
Location: Moncton, N.B.
Posts: 276
Likes: 24
Liked 24 Times in 13 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
So, is it a fact, that the advertised runner volumes on the replacement heads are
acceptable? In my case, my 624's are to be 168 CC's in/on the intake. So the aluminum 175 CC's would be accepted?? Terry K |
02-22-2018, 04:37 PM | #29 |
Junior Member
Join Date: Aug 2013
Posts: 28
Likes: 0
Liked 72 Times in 6 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
Back on topic 350 chevy heads , why would any racer go to all the trouble to approve iron head such as the dart 1070 . You would have to mill intake flange off or valve cover rail to get to 165 .
|
02-22-2018, 04:46 PM | #30 |
Junior Member
Join Date: Aug 2013
Posts: 28
Likes: 0
Liked 72 Times in 6 Posts
|
Re: Thoughts on accepted aftermarket heads for 350?
Stock runner must be same size as head it is replacing. According to stock head cc guide sub notes on replacement heads
|
|
|