Floating Valves?
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Floating Valves?
Hello I have got a 1981 Ford 302 I have got the 1986 high compresion heads on it. I put a 268 duration comp cam in and it has got .428 Valve lift. I put new everyting in but pushrods, vaves, and springs. It drives around great unless I get to 5200 RPM's in any gear, then it just loses power. It doesn't accellerate anymore. Doen't matter in I let up on the gas or not at that RPM it is done. It does have points, and a new distributor. I think the valves are floating other than that I have heard that is as far as the cam will let me go, but the specs. say 1500-5500. For best performance. I don't hear any noise either just he sputtering sounds like through the pipes and the carb. I think can't tell if through the carb.
New:
True roller timing chan and gears.
Oil pump
Pistons
Crankshaft
Bearings
Cam & Lifters
I lapped the valves.
Block Bored .030 and Dipped.
Thanks Alot. Knowone can figure it out not even the locals.
New:
True roller timing chan and gears.
Oil pump
Pistons
Crankshaft
Bearings
Cam & Lifters
I lapped the valves.
Block Bored .030 and Dipped.
Thanks Alot. Knowone can figure it out not even the locals.
Thread Starter
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New User
Joined: Jan 2005
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Floating Valves?
I have a 1981 Ford mustang 302 just rebuilt. Wondering if the valves are floating. I put a set of 1986 heads on cause they are high compresion ones.
I have a comp cam 268 duration .428 lift and a 1500-5500 RPM operating range. I did not change the valve springs. They are stock and have no clue how many miles are on them. When I am driving and I get to 5200 Rpms in any gear it starts sputtering through the exuagst and the carb I think. Doesn't matter if 1/4, 1/2, or Full throttle at 5200 Rpms. It still does it, and has no power won't even keep accelerating. I also have a new points Distrbutor in it. The eninge is in my 1987 Mazda B-2600 Thanks for any info.
I have a comp cam 268 duration .428 lift and a 1500-5500 RPM operating range. I did not change the valve springs. They are stock and have no clue how many miles are on them. When I am driving and I get to 5200 Rpms in any gear it starts sputtering through the exuagst and the carb I think. Doesn't matter if 1/4, 1/2, or Full throttle at 5200 Rpms. It still does it, and has no power won't even keep accelerating. I also have a new points Distrbutor in it. The eninge is in my 1987 Mazda B-2600
Thanks for any info.
CO River Rat
Joined: Feb 2004
Posts: 3,209
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From: Lake Havasu City AZ
Stronger valve springs will help valve float, but they're hard on lifters/cam lobes; what does Comp Cams recommend for your cam? You could also be at the limit of the points' rubbing block to follow the distributor lobes.
Steve
Steve
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Distributor points
Hello its me. The engine before I rebuilt it had the same distrbutor in it and it never did it then. So I had ruled that out of the question. Thanks I will look at comp cams recemendations.
