Ok so no tach ?
72mm tilly 275cam .80 over clone crank big valve head 1.3 roller rockers and Ultralight pvl magneto system and Barry young sa carb on alky and the gear ratio changed when I put the 1.3 rockers in it Wisco piston and 3.595 billet clone rod
Based on 7500 with 11 /66 for 6800 rpm you should be at 12/62 or 63 not a 12/60, however good chance your 7500 rpm reading was not accurate as you were still gear bound, bottom line you need a tach asap even if it's only one of those $20 deals that only give rpms.
I had got 1.3 rocker and a big bore carb put in it so it changed a lot
Where can you find one of them I can’t find none except expensive ones
Confused again !! I'm taking it like your now on a different motor than when you first posted ? But you were saying 6800 rpm then, and your still saying 6800 rpm target, so what changed a lot ?
Last week there was a post showing one, I forget what it was, flattop can you help him ?
I went for stock rocker and holymoses carb to 1.3 rocker and Barry young sa carb and not the gear is a lot different it’s the same motor just put different rockers and carb on it
Ok we cleared that up, but your still saying your looking for 6800 rpm, so IF the 7500 rpm reading was correct with the 11/66 for 6800 rpm you should of been 11/59 ish or if you want to try the 12 driver it would be 12/63 ish.
Yes sir then why with a 12 /60 it’s wouldNt pick with cut out mid straightway
As flattop pointed out, the motor is just not running right now, or with the 11/66 you were gear bound way off on gearing, I don't know if you need to go as drastic of a change as a 14/66 to prove that, but I'd take a big swing at it to confirm.
I’d say a little bigger than a bull rig
Thank you
That's funny I was doing the same thing when I saw you posted !!I counted 53 tires 10 ft c/c so 530 ft on the inside .
23 hp should help some on the tight end.
