Thread: 72 402 Truck Motor Performance, Any Ideas?

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Kade, nice ride! Dont worry about asking questions...You're right, that's how you learn. We have all been there! I guess you have to have a bit of a thick skin sometimes in the forums. Please dont take it personally. Richard has done a big thing by apologizing too. See, we're not such bad guys! I was going to mention the LSA thing...you can have that idle that you talk about, but remember, you will give up a little in performance in some areas. Maybe you will notice the small losses, maybe you wont. Call Howard's Cams (owned by same guy as Competition Products) and speak with John or Scott 920-233-5228. Tell them exactly what you're after, and they'll advise you. They grind their own cams, so they have first hand info. Keep on learning, and hopefully you'll still visit us and ask questions from time to time. And keep the pictures coming! As long as they're not of an Eclipse or Honda!!! (Unless it has a BBC in it) John

Originally Posted by 1JohnnyO

Kade, nice ride! Dont worry about asking questions...You're right, that's how you learn. We have all been there! I guess you have to have a bit of a thick skin sometimes in the forums. Please dont take it personally. Richard has done a big thing by apologizing too. See, we're not such bad guys! I was going to mention the LSA thing...you can have that idle that you talk about, but remember, you will give up a little in performance in some areas. Maybe you will notice the small losses, maybe you wont. Call Howard's Cams (owned by same guy as Competition Products) and speak with John or Scott 920-233-5228. Tell them exactly what you're after, and they'll advise you. They grind their own cams, so they have first hand info. Keep on learning, and hopefully you'll still visit us and ask questions from time to time. And keep the pictures coming! As long as they're not of an Eclipse or Honda!!! (Unless it has a BBC in it) John

No big deal, like I said i appreciate the help. You guys haven't scared me off yet.

Well I ended up with some 97cc closed chamber heads off ebay. I hope these will be good also.

That's cool...post the numbers so we can ALL see what you bought!! Small chambers will be good for your compression.

3856206....65-66...oval..CLOSED..396, 97cc chamber
That be them.

Basic Operating RPM Range: 1,500-6,500 RPM
Intake Duration at 050 inch Lift: 240
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 240 int./246 exh.
Advertised Intake Duration: 300
Advertised Exhaust Duration: 306
Advertised Duration: 300 int./306 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.560 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.573 in.
Valve Lift with Factory Rocker Arm Ratio: 0.560 int./0.573 exh. lift
Lobe Separation (degrees): 112

That is the cam I bought.

Kade, those are good heads, a friend of mine is running in the 10's with them!! He had the bigger valves installed, and just mild porting and unshrouding, very minor. That cam should be OK I think. What brand did you end up getting? I dont know what you're going to do with the heads, but make sure your machinist knows what the lift of the cam is that you're going to use, and he can see that you wont have any interference with the top of the valve guide. Thats not a huge lift, but you have to check anyway. Also, dont forget to check your piston/valve clearance too. Keep us posted on your progress. John

Originally Posted by 1JohnnyO

Kade, those are good heads, a friend of mine is running in the 10's with them!! He had the bigger valves installed, and just mild porting and unshrouding, very minor. That cam should be OK I think. What brand did you end up getting? I dont know what you're going to do with the heads, but make sure your machinist knows what the lift of the cam is that you're going to use, and he can see that you wont have any interference with the top of the valve guide. Thats not a huge lift, but you have to check anyway. Also, dont forget to check your piston/valve clearance too. Keep us posted on your progress. John

The heads have been hot tanked and fluxed with new guides and seals and they checked the stock springs and they were supposed to be good. The cam is a edelbrock. I went with the edelbrock because I figured they had tested the cam with the pro flow system and knew if it would work or not. This is just a street motor and I will not be drag racing, just cruising and going to car shows. I hope this combo turns out good. Reckon the heads will perform ok with stock valves and springs?

no it will not . good springs are not that much .buy some springs that you know that can take the lift. if you use them and do not have them to check bad things will happen .coil bind . is one thing that will follow$$$. you will be running the spring at the max and if you shims the old springs then you are past the safety factor. less they are new and will set up for the lift. trash them they are junk . if you machine shop can not do this for you take you heads and run aLOT OF YOU VALVE TRAIN PARTS may not take the lift guilds may need to be cut down steel stock rocker may not work they can hit the stud and you may not have much piston to valve not one thing i posted can past up not to be check. or have some fool tell you it is fine with out checking it

Originally Posted by pat mccarthy

no it will not . good springs are not that much .buy some springs that you know that can take the lift. if you use them and i do not have them to check bad things will happen .coil bind . is one thing that will follow$$$. you will be running the spring at the max and if you shims the old springs then you are past the safety factor. less they are new and will set up for the lift. trash them they are junk . if you machine shop can not do this for you take you heads and run aLOT OF YOU VALVE TRAIN PARTS may not take the lift guilds may need to be cut down steel stock rocker may not work they can hit the stud and you may not have much piston to valve not one thing i posted can past up not to be check. or have some fool tell you it is fine with out checking it

Pat I appreciate that info I will get me a set of good springs and I was thinking of some roller tip rockers.

not a big fan of roller tips .a full roller or stock type for $80 . more you can get some harland sharps or crane builders roller rockers . with the roller tip you still have the rocker balls and in time they groove the rockers bodys if they have grooved balls for more oil ??? grooved balls are junk .stock ones work better in the long run. if you buy the roller tip, you do not loose the friction of the fulcrum ball of the stock rocker with the roller tip or stock type rocker so the tip will not see much with a roller on the tip ? i think. where you need the roller is at the fulcrum and you do not get it with a roller tip so i think stock or full roller if you go to stock type rockers get a set of long slots

Sounds good, and once again thanks for the vitial info.