Missed on this combo?

Ironmike said
Man, you guys are great! I'm learning so much just from this post....and YR, I cant thank you enough for the offer. I may even take you up on it. I have some things here to address. Going to be a bit long and picture heavy, but i'll try to be straight to the point.

1. the issue of my lift at the valve. Well if you remember I came up with .626 at the retainer. Supposed to be .668 per cam card. I know about geometry loss and all that BUT....got home from work and decided to measure the lift on my "in car" engine.
The cam is a Lunati showing .640/.640 on the card. You can see in the 2 pics I came up with .623 and .618. Add the 0.14 lash and you come up with .637 and .633. You can see the indicator for yourself. Remember you're reading it backwards from zero. I did it 2 different ways. So......the fact is my Lunati with .400 lobe lift and 1.6 rockers came up very close to the card specs for "valve lift"(.640). Within .007.

And the Bullet with .4176 lobe lift and 1.6 rockers came way short at .626. .042 thousands short. Thats a lot of lift to lose compared to .007. So either cam is off or rockers aren't right. Which is off is anyone's guess. But something ain't right.

Next issue, my dyno guy calls me AT WORK today, on Sunday cause it's buggin' him too. He asked if I remember which pipes we had running out the wall. He said we might have used some 8 inchers that he was using to dyno some blown alcohol thing earlier in the week. He usually runs a 4 inch pipe from the header through the wall. Said if we did, that may have a LOT to do with the numbers. Especially torque.

I happen to take a couple pics that day and sure as hell those pipes don't look like 4 inchers coming off the header. Can that really make much difference?

Last, I posted a couple crappy pics of an exhaust port. Don't know if you guys can evaluate the porting or not. Hard to get a good view with my camera.

Well, thats all I got for now. Don't know whether to call Hughes or Bullet tomorrow. Personally from my measuring at the pushrod......I am pretty sure the cam is not right.

Maybe all I need is a proper cam and smaller pipes on my next trip to the dyno?View attachment 1715027435 View attachment 1715027436 View attachment 1715027437 View attachment 1715027438 View attachment 1715027439 View attachment 1715027440

I hate that port as much as the next guy but it's better than the OEM port. I can't see the short turn. Maybe it's not finished correctly but I can't see that from the picture.

If you feel like it, you can take the rockers off and mount you dial indicator as secure as you can get it. Take an old pushrod and cut it off as short as possible and still get the indicator in line with the lifter. Then very carefully just measure the lobe lift. You already know what it is at the valve. The trick is keeping everything in line. I like the indicator to just sit in the end of the cut pushrod. It keeps things stable.

I'm no betting man but, I'd bet a bunch the error is in the rocker. In 1987 I ordered a crower cam. It was a catalog grind but it was close enough except for LSA, so we had them move the LSA from 110 IIRC to 107.

When the cam showed up in January of 88 the numbers on the card weren't close to what the catalog called out. So I called crower and they said moving the LSA that far made the events change a bit. So I gained some lift on the intake, lost a bit on the exhaust and the at .050 numbers had a bit more split than I wanted.

When I installed the cam, nothing on the card matched the cam. Not one intake lobe matched another. Crower blamed the rockers, but I checked stuff at the lobe. Then they said my lifter bank angles were poo-poo. Bad thing was, the bores were lifter trued and bushed. I think that engine only made 625 or so at 7800 so I was disappointed.

BTW, I have a used, true Harold Brookshire UltraDyne roller cam in the for sale section. Tell you what lol do. I will send you the cam. You test it. If it makes power, you owe me the shipping. If not, I'll pay you to have it shipped back. I posted numbers in the for sale section but I found the cam card and I don't think I have all the numbers correct there.

The numbers are:
278/281 .050
.640/.640 I lashed it at .022 hot
106 LSA goes in at 100

If you want to try it PM me your info and I'll send it out tomorrow. You could at least see if you are going in the right direction, relative to duration and LSA.