engine won't rpm

[ericandkayti]

i built a 408 w/ solid flat tappet, and pro comp 210 heads. i have had 2 different cams in it and it will not rpm past about 6200 rpm. i do have valve springs on order, so i will be doing that this week. any ideas or suggestions would be appreciated.
thanks
eric

[BK Meyers]

Check for fuel starvation. dropping fuel pressure or a pump going bad.

BK

[MR 408]

Did you ever find problem? Have similar problem.

[Casper302]

Check the rev limiter LOL



Not enough fuel, bad ignition, too hot spark plug, too rich, too lean.


My engine (14.1 compression 393) would spit and sputter in 3rd gear around 5500. I changed Power valves, Jets ect. I had NGK number 6's and I went online and checked out a few sites that show you how to read a plug...:rolleyes: Sure enough I had too hot of a plug, switch to a NGK #8 and it runs up to 7200 RPM without a hicup.

[donn92]

I had the same problem and after chasing every suggestion I found that my distributor was out of phase replaced it and had no problems since hope this helpd

[Reaper Motorspo]

had same problem with same heads changed springs and its all good

[ilv6662]

I had the pro comp 225's and had the same problem. It dropped a valve in garage at idle changed springs to comp cams set up and still would not rpm & blew a head gasket.

Changed heads (the fix) same springs & valves no problem.

[whitefieldm]

Hey I have a 472 big block ford with the cast iron scj heads and solid roller cam in my pulling truck and freshend up the trans and added 500 rpm to my stall speed and the truck is a dog about 5500 to 5800 rpm is all it will go . NEED HELP...