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.