How big of a cam can i go with stock pistons???

[mustangman70]

I want to add a cam, if it matters i will be spraying a 100 shot on the car, so will i need any special "nitrous" cam or anything? The nitrous will only be used like 2-4 times a month tops, but here is where my question is......If i have stock internals, what are stock pistons like, as in they are dished right??? Ive heard that you can run a decant cam with dished pistons

Im not sure exactly what pistons are in there, but the block is out of a 66 mustang, its a 302, and i giuess what im getting at is....whats about the biggest cam i can use without having to notch the pistons

 

[geostang351]

If its a 302 then it is not original with the 66. The 302 wasn't produced until 68. Check the numbers on the block to get the build date. I not a NOS pro or really know anything, but from what I've read, it would be a good idea to match the pistons with NOS

 

[69Rcode_Mach1]

If you plan on running nitrous you may want to get a nitrous cam I think they are the same as supercharger ones because you will need more duration on the exhaust. Im not a nos expert either someone should chime in.

 

[mustangman70]

Ok, it IS in fact a 68 302 block, (thats the car that HE got the motor from)

LOL Its went from a 68...into a 66...and found its happy rebuilt home into the 70 lol. Also, It was rebuilt with dished pistons

 

[iskwezm]

See my screen name I ran a 125 shot on my car for years,all it had was "stock" TRW cast flat top pistons,it did have small valve reliefs though.The last cam I had on it was a Edelbrock RPM cam with .490/520 lift.I did tap the valves a couple of times untill i changed the springs,the factory Edelbrocks were too weak,so you might wann go a little smaller.The diffrence between a nitrous cam and a regular cam is the N20 cam will have more durration and i think overlap to help in scavenging.I had a comp cam 270 before that worked great on the bottle. I also run a 130 shot on my 94' GMC pick up with a stock 5.7 that saw MANY bottles without a problem.

 

[mustangman70]

Hrrrmmm, did you like that cam????

 

[racingtheburg]

I have found its just the matter of trial and error...

Pam and some playdo

pam spray on the piston so the playdo does not stickand on the valves...Put a good headgasket on tq her down spin the motor around 10-20 times and see how bad the valves go into the piston's measure the distance with a dial caliper on the playdo and this should tell you how much room you have to play with !

I have seen 1.7's on a stock 302 with ease and some would hit the piston.

All depends

 

[iskwezm]

Hrrrmmm, did you like that cam????

The comp cam 270 was a good cam,big enough for power and choppy idle,but not to big to mess with the torque convereter.

 

[Pbum5]

For a time I ran a Comp Cams 292 - with
.534 lift.
It ran strong and sounded great. I also had some head work done though.
I have a 4-spd and manual brakes so the lack of vacum and stall were not an issue.

 

[mustangman70]

But could i run the Comp 292 with stock pistons

If not i like the specs of the 270 also

 

[iskwezm]

But could i run the Comp 292 with stock pistons

If not i like the specs of the 270 also

Ill even sell you mine,it has bout 5k miles,but no lifters

 

[mustangman70]

but will it work with stock pistons?????? If so we may be talking....how much????

nd what type of cam, Is it a hydralic? roller?

 

[mustangdave]

The only way to know for sure is to mock it up and clay the pistons. There are too many different variables to answer this question: piston design, rebuilt rods?, head design, head and/or block machining.....

 

[mustangman70]

The only way to do the clay thing is to pull the heads, and put clay in one of the cylenders right??? but dont i need the new cam to do this???

 

[iskwezm]

but will it work with stock pistons?????? If so we may be talking....how much????

nd what type of cam, Is it a hydralic? roller?

my pistons were stock replacement and the cam is a hydraulic.How does $50 plus shipping

 

[mustangman70]

Hrm let me think about that, the guy i bought the motor from is digging up pitures from the build, and he thinks the pistons were notched.... if they were i can go bigger lol

 

[1967coupe]

I may be interested in that cam if he isn't.

 

[mustangman70]

How lumpy is the idle on the 270H :dunno:

lol i want people to know i have a cam

 

[Pbum5]

But could i run the Comp 292 with stock pistons

If not i like the specs of the 270 also

I ran the 292 with stock pistons.

 

[mustangman70]

stock size rods also??????