Than why does a 525efi with the same cam work so well at 8.75:1. I am technucally at 8.27:1. Nothing major. The previous 9.6:1 is irrellevant considering the heads flowed as much as a pinto running on 2 cylinders. Lol. Sure the low end torque was great. But top end sucked. On old heads from 4500 to 5100 rpm rise came to a crawl. Sure it got there but took forever. New engine instant. I may have figured it out. I loaned the distributors to a buddy to try out on his twins while mine was down. They are pertronix ignitir 3 with rev limiters. I asked him if he messed with them and he said yes but didnt recall what rpm he set them to. Will find out tonight.

the facts billyboats stated are all contributing facts to the poor performance of these engines,also without degree checking of the cam,s position with the crank the specs on the cam are not factual.all those specs are based on the cam being properly phased with the crank.lets say your cam is 5 deg retarted from correct phasing,now you are bleeding off even more compression down low,it might make power at 6700 rpm but it can,t go past 5100 because it does not have the power to do so.mercury marine produces an engine that can run on 87 octane fuel,only has 8.75 c/r and uses a pos edelbrock head.with the same cam,10/1 cr and a good cylinder head 600 plus hp would be all day every day.

If I remember right the silver spring doesn't fully advance until 5 or 6k. However if you cked timing that wouldn't be an issue. Go to pertronix site and go to HEI distributors and find your model and download. This is just for your own info but should know what you have going on if you had a friend messing around with them since you used last. People have a tendency to change things just to see what happens but in reality don't have a clue. So regardless make sure you know what you have. Just a FYI.

Silver spring all in by 3500. Well checked rev limiters or at least tried to. When i loaned them to him they were set with limiters off he had them set somewhere because they were not fully clockwise. Problem is the pos will not go into relearn rev limiter mode on either. FML. No led blink. Nothing. So two new ignitor 3. I could literally burn this piece of crap to the ground right now im so pissed

Hang in there it only seems to get worse. Lol.

Sounds like sime motivational speeches I gave in the military.

Does anyone know of a propshaft dyno in AZ

Carbs are too small, IMO. They need 850's atleast.

I would check that the timing is good, plugs look fine, and run the b!tch. Save money for blowers and then start the chit all over again LOL

Pertronix is sending two new ignitor 3 modules. They said it sounds to them like the modules are bad sense the leds on both do not respond to adjustment. We will see.

Blowers.... Rembember you get to do the distributor/ign thing all over again when you go SC. Another 1k per side. Fun fun.