331 Dyno #'s Dead @ 5100 RPM (Long)

[Fox-4-Cobra]

Went back in with new 65mm TB and C&L 76mm MAM kit. Gained 14.5 HP and 9 ft lbs TQ. Timing was bumped and clutch was fine so I guess the GT-40 heads must be killing me.

Twisted Wedges or AFR's will be my next purchase after I can save a little jack in the next few months. I'll post an update after that and let you guys know how it goes.

Thanks for the help!

[fiveohpatrol]

post your air/fuel curve from either run, it really sounds like you're going lean and not making the power it should

[andy669]

The heads should not be the problem. I have seen 330rwhp with a stock cam, 306, GT40 intake, shorty headers.

Take a 3 1/2 inch floppy with you to the dyno. Have them save your files to it, then email them to me. I have WinPep and can post all the info.

Andy

[Dark_5.0]

Originally Posted by andy669

The heads should not be the problem. I have seen 330rwhp with a stock cam, 306, GT40 intake, shorty headers.

Take a 3 1/2 inch floppy with you to the dyno. Have them save your files to it, then email them to me. I have WinPep and can post all the info.

Andy

I am with this guy

[Fox-4-Cobra]

I did not clarify in my update post that the peak HP stayed put from 5100-5300 before dropping this time.

I dont know much about the computer systems and programs that work with the Dyno's. Would I have to get another run or would they have it saved from my tune so they could check it with the next upgrade? I would love to get it and e-mail it to you guys.

I figured the GT-40 Irons would hold me back some but felt the car would put out 275-295 RWHP as is. I was originally planning to use those heads until winter and then replace them for something better. If it's not the heads then I'am at a total loss for what would be holding me back.I did not expect over 300 RWHP with the GT-40 Irons with just a mill job and 3 angle on them. I have tried replacing the TB, Fuel Filter, Plug Wires and MAM and gained so little

I'll call the shop and see if I can get something worked out if they save the programs. Hate to drop another $ 100-150 on a retune without heads.

Appreciate the help guys.

[andy669]

They will have them saved and they might even be able to email them to you. The files are only 4k each. Did the dyno operator have any ideas? Where was the fuel pressure, and did the tuner note the injector duty cycle?

Andy

[fiveohpatrol]

well that vette has a 350, and you should be able to whoop him even with your car not making all of its potential hp. The pre LS-1 Vette's are WEAK (ZR-1's not included )