65’ GTO gets a new set of CV-1’s 👍🏻
 

One of our CV-1 customers in Tennessee (Mike Moak) just got his new top end installed on his 505 combo, the car previously had CNC’d HighPorts (380cfm) heads with a ported NorthWind manifold, Mike’s car is a 65’ GTO full steel car that he drives and is a simple pumpgas combination, the car would typically run in the 6.74-6.76 range in the 1/8th mile, so he was anxious to see what the car would run considering his new CV-1’s are as cast and the manifold also is unported … it ran a 6.45 right off the trailer 1st time out, needless to say he was very happy considering no tuning has been done yet, the only thing he changed was the heads and manifold, and yea pistons too because of the different valve angles but still flat tops, great job Mr. Mike ����

Strong performance. That's good MPH for the ET. What's the cam specs? If Mike doesn't mind sharing

65 GTO 3550 lbs ; 4:10 12 bolt ; old 28-10.5 bias slicks ; solid roller cam .727 intake .676 exhaust ; duration @.050 I-285 E-298 ; around 11-1 compression 93 octane pump gas ; 8" converter PTC ; reverse manual 400 tranny ; 505 MR1 ; 4.35 bore ; 4.25 crank ; 6.8 Crower Sportsman rods ;

Gosh, got to wonder if that would be quicker with 3.55s or dare suggest 3.31:1s

I don,t think so. The duration @ .050 is quite large.
Wallace says (with 200lb driver) 687 flywheel HP from ET. But 733 HP from MPH.

According to the notes posted it says 58cc chamber. The post says flat tops, how thick are the head gaskets to come up with 11:1 compression? Or am I missing something?

Cool build. The CV1’s appear to flow quite a bit more from 400”-700”. Same cam with both combos?

Hi Paul, I told Bill the compression. I didn't try to figure the exact #. I had Wiseco build the pistons and told them that I did not want to be over 11:1 compression, But what I can add is the pistons have a -30.7 dome volume and used Cometic head gasket .045 compressed thickness. Mike

Any flowbench numbers to what the 380 highports actually flow and not just going of the number vs what the cv1 flow?

Doesn't the first post have a flow sheet for the KRE 380 heads?

Stan

yea, im an idiot and didnt click on it, but are these as is from kre?

Those High Ports are very close to my HPs up until .700 lift. And my heads have stock port openings, bowl work only.
They never get to 380cfm, even at 1" lift.
More like a 350cfm head where you can use it on a street driven engine.

This show a head from a couple of videos that David Vizard has just posted. You have the stock head and a ported head. you can see that the ported head only really starts making a big difference after a lift of .25 times the intake valve diameter.

Stan

Bill, No further work had been done to the KRE heads. I sent them to be freshened up at Sonny's and they flowed the head.

… thanks for reminding me of that, I was mistaken about the pistons, it’s been awhile so I may have been a bit rusty on those pistons lol … thanks for clearing that up … I’ll make the corrections on FB 👍🏻

… bore cylinder size on the flowbench could be responsible for that … I used a 4.375 bore to flow both heads because that’s the only size I had available for the Pontiac fixture at Sonny’s …

… that’s actually the chamber volume of the small bore version of the CV-1.1’s but Mike’s are slightly larger as his are the large bore heads, sorry for the confusion …

… I don’t think the car would go faster with those gears …

… yes same camshaft … 👍🏻

I think the cam, on the large size was a much better match with the CV-1 heads than the High Ports.

… that cam made the GTO go the fastest it had run with the HP heads and make the most power it had done on the Dyno with the HP heads …
… so what exactly is your reasoning for thinking the cam favors the CV-1’s more than the HP’s ??? …

Bill,
Could you or Mike post up a dyno sheet?

You have read this forum long enough to know there are some strange ideas about cam selection here.

Thanks,
Stan

What was the MPH difference ? That is the measurement of power.

Just under 3 mph

Mike Dyno tested the HP combo awhile ago but the CV-1 combo wasn’t run on the Dyno …

What heads were on it before the High Ports ?
The cam is a good 20 deg more than the cam I am running in my 461 with High Ports.
Its just my opinion, that cam was not a great match for those heads and his combo.
Its going to want more head and the converter and gears required for a .285 @ .050 is not street friendly.
Kind of a miss-match and the CVs helped the situation.

… unported HP’s we’re on it previously, but you’re saying the CV-1’s are more head, in what way ?? …

… cam is fairly snotty but still drivable, so what I looks like you’re suggesting is the CV-‘s don’t make this improvement if Mike had a smaller camshaft ?? …

To make peak HP at the same RPM as you, how much more cam does his 505 ci engine need verses your 461 ci engine if both are running the high-port heads?

Also he is running a SRT cam is your cam Solid or Hydraulic?

Stan

I don't get your logic. Just because it's a bigger cam than you run?? Street able?? That's an opinion. I'm running a .276/.284@ .050 SR. I have driven it on the street. It idles at 1100-1200 rpms. It's kinda rowdy but it's all about what you are willing to accept as street
The HP heads flow close to what the CV1 heads flow, just a little less so I don't see the cam being such a miss match for the HP heads

That is not what I am saying at all. I am saying the combo as done originally was strange. Not a good match.
3550lb car with 200lb driver running a 6.74 is showing 675 HP and a 505 with that much cam should blow well past that level.
Its near the same weight as my car, same gears and my old 455HO had the same 60 foots or better and would go in the high 6s in the 1/8th. Lot of money for a couple of tenths.
Its just my opinion for whatever that is worth but a cam that big in a 505 should have lower than 4.10s with a big stall converter to make it work.
Just a strange combo and your heads helped it work better.

… you know what Mike weighs ? …
… maybe you can post your time slips ? …
… maybe you could post actual details of your car, including weight ? …
… maybe post your actual experience and track data with a HP combination? …
… so Mike’s HP combo is “Strange” now ? …
… so apparently you’re smarter than Kevin Sweeney ?

We all knew where this thread was headed................

:ranger:

SMH! :D

… yeah he clearly doesn’t care for the CV-1’s, so I figured I’d just ask questions based on his posts …

I am not going to say one bad thing about your heads.
Clearly the owner Mike, who I am sure is a fine fellow thought his 505 with the 380 High Ports was not what he wanted, paid a lot of money for that stuff. So he bought your heads and it ran quite a bit faster.
I know 2 people who bought some of KREs CNC High Ports. A 380 set and a 400 cfm pair.
Both were unimpressed and sent the heads out to another head porter and both commented that the ports were tall and kind of narrow.

Who Is Kevin Sweeney? Also what makes him smart? ..... Just curious

Just a fwiw the amount of duration on that cam is almost same as mine that made 1050hp @8000rpm from a 511ci. Seems like a lot of duration for this application to me.
3 tenth in 1/8 is a good gain for sure

Exactly. I thought of builds like yours when that cam was posted.

… well paint me stupid because I didn’t expect that 👍🏻 …
… so does that mean you think the CV-1’s are good heads ? …

… I can agree with that, but that’s what Mike has in the car so we wanted as apples to apples as we could get and a cam change with the new heads would’ve negated that data …

… maybe the next cam makes it even faster 👍🏻 …

Shouldn't be hard to pick up with, current cam leaves a lot on the table imo

Thats a loaded post with loaded questions called "quick sand".

I do not know what Mike weighs, used 200lbs for the math.
What my heap has done is no secrete.
10.80 guy, not sure if I could fit all my NHRA trophies in the trunk of ,my GTO.
Yeah, whoever originally set up his car, kind of strange. 8000RPM 900 HP cam takes a whole lot of other stuff to work. 1250 carb, 5500+ converter. Not your average pump gas 505 for sure.
That guy... I would let you port my heads first.

A 505 on its second set of aluminum heads running a 6.74, well, that is how BBCs end up in Pontiacs.
I am just glad he got it straightened out and still has a Pontiac in it.
Whatever head keeps a Pontiac in a Pontiac is a good head.
With the right cam and converter there is a lot more left in it.
Get the 60fts down in the 1.2s and let it eat.

Brian,
Not saying Mikes cam is right or wrong, but the cam is part of a combination. He had .727 intake lift and the head flowed around 367 cfm there. What was your intake valve lift and head flow at that lift?

Stan

Really? :eek::eek:

Stan

… yeah, exactly… 🤣

… you never of heard of him ? …

Well, high 1.2s might be a little optimistic. But he should be able to get a mid 1.3 out of it with more tuning Takes 750 HP.
I have little doubt my 461 will get me in the 1.3s.

You guys must be nights owls too.