confused??????

[psgp]

That cam is for a fuel injection, just lookin at some specs, there is only 48 degrees overlap and the lca is 112 when is should be at a max of 110. It has a decent lift and duration but the overlap is too small. More overlap helps fill the cylinder during the intake stroke. The cam is deff. slowing ya down.

first pass off of trailer after rebuild was 14 21 @91mph then went slow after that then 2nd week out ran 14 44 off the trailer now its been 15 20-43 range and the cam we used last yr was the 08-501-8 and was running 14 50-70s

 

[jetsetw31]

That cam is for a fuel injection, just lookin at some specs, there is only 48 degrees overlap and the lca is 112 when is should be at a max of 110. It has a decent lift and duration but the overlap is too small. More overlap helps fill the cylinder during the intake stroke. The cam is deff. slowing ya down.

X2 on that being the wrong cam for you. It's pretty mild. With most of the mods suggested you won't break a 14 in the 1/4. I'd put the old cam back in or try 08-445-8.
Is the old cam a Hyd roller also? I don't think you mentioned it. I also hope your using Comp's roller lifters. The stock used rollers won't hold up to high lifts very long. Also don't use 1.6 rocker arms even with new factory rollers. I've seen them let go at about 5500rpm with 1.6s. Just letting you know.
T

 

[psgp]

That cam is for a fuel injection, just lookin at some specs, there is only 48 degrees overlap and the lca is 112 when is should be at a max of 110. It has a decent lift and duration but the overlap is too small. More overlap helps fill the cylinder during the intake stroke. The cam is deff. slowing ya down.

X2 on that being the wrong cam for you. It's pretty mild. With most of the mods suggested you won't break a 14 in the 1/4. I'd put the old cam back in or try 08-445-8.
Is the old cam a Hyd roller also? I don't think you mentioned it. I also hope your using Comp's roller lifters. The stock used rollers won't hold up to high lifts very long. Also don't use 1.6 rocker arms even with new factory rollers. I've seen them let go at about 5500rpm with 1.6s. Just letting you know.
T

old cam was hyd roller also stock rollers also and 1.5 rockers we ran a 14s twice with new motor but now 15s just wander what happen to why it slowed down only change in motor was a cam and bored 30 over and a lil more dome on piston to get to 10 to 1 compressin ratio everything else same as last yr

 

[BPTTONE420012]

random thought... not sure where you live but i know when i was down in NC a few years back they have PURE gas stations and ethanol added gas stations... my car hit harder on the pure gas, didnt realize my wife put that corn crap in my car till i hit the gas and she had a noticeable loss in power... if you have any pure gas stations in your area, run your car as close to empty as possible then fill her up with 93... i think the name of the site to find all the pure gas stations is puregas.org
i know tgis isnt why the car slowed, but its just helps get those few extra ponies to the tires

 

[psgp]

heads are the 083 and machine shop took 12 thousand off and we were told with new pistons that say 3.5cc dome was 10 to 1 compression old pistons are thhttp://www.summitracing.com/parts/slp-h618cpese will add exact specs on new pistons when i can thanks

 

[psgp]

heads are the 083 and machine shop took 12 thousand off and we were told with new pistons that say 3.5cc dome was 10 to 1 compression old pistons are thhttp://www.summitracing.com/parts/slp-h618cpese will add exact specs on new pistons when i can thanks

new pistons http://www.probeindustries.com/Chevy_35 ... /13721.htm

 

[psgp]

anymore suggestions to try ?? need more info?? want to figure this car out thanks for all the help

 

[bygddy]

Well, the compression is way way high for pump. You mentioned decking the block and shaving the heads, with the pistons in it now, on an undecked block, and 64cc heads with a standard 0.041 head gasket your right at 10.77:1.
Now if its been zero decked, its in the 11.5:1 range.....take a couple cc's out of the chambers and were nearing 12.1
Not even remotely doable on pump.
If its detonating itself to death right now its going to run like garbage and slow down each and every pass.
So lets assume its on race gas or E85
Now the limiting factor becomes the heads again, you have heads that work well to 480-500 lift with some porting at Max effort, you have a low rise intake best suited for the street rod guys or a boat anchor, and compression and cam that isn't matched to either. Then add a dinky vaccum secondary Carb and here we are.
This motor needs heads, then an intake, then a Carb. Then E85

 

[psgp]

Well, the compression is way way high for pump. You mentioned decking the block and shaving the heads, with the pistons in it now, on an undecked block, and 64cc heads with a standard 0.041 head gasket your right at 10.77:1.
Now if its been zero decked, its in the 11.5:1 range.....take a couple cc's out of the chambers and were nearing 12.1
Not even remotely doable on pump.
If its detonating itself to death right now its going to run like garbage and slow down each and every pass.
So lets assume its on race gas or E85
Now the limiting factor becomes the heads again, you have heads that work well to 480-500 lift with some porting at Max effort, you have a low rise intake best suited for the street rod guys or a boat anchor, and compression and cam that isn't matched to either. Then add a dinky vaccum secondary Carb and here we are.
This motor needs heads, then an intake, then a Carb. Then E85

your probably correct was told by machine shop that these heads were 76cc and they look it not small like 64cc and we have had 2 passes under14.50s its been running consistant 15 .20 the last 2 weekends not slowing down at all thanks for the input

 

[bygddy]

Get a new machine shop then, because unless they cc'd them and the chambers were opened up a ton they aernt 76cc heads, if the motor was put together under the advice of a machine shop, its time to find someone new, or pick up Vizards books and do it yourself.
Good luck.
Dave