Fast355

My Hemi did it, gained nearly exactly 100 RWHP @ 6,200 rpm, peak to peak was around 60 HP. Went from 285 to 345 HP, then opened up the exhaust, used a short belt to bypass the p/s and a/c compressor, and ran E-85 and put down 385 RWHP.

Funkster

iTrader: (97)

I didn't say not possible.

However, the OP is asking about a peak to peak situation it seems. Also we are not talking about a Hemi, apples to oranges.

Fast355

Its not nearly as apples to oranges as you would think.

The engines have many design similarities, very close to the same head flow and valve size, and the intake designs are similar. The factory cams have very similar specs to the stock 5.3. Not to mention Comp Cams uses the lobes they designed for the LS1 for the modern Hemi. More similarities than differences.

calboi

iTrader: (2)

^who'd thunk it

Funkster

iTrader: (97)

Well, I have to say I don't think a design concept being similar on an engine with different displacement makes it directly apples to apples, but we are all entitled to opinions.

This still doesn't change the fact that 60hp peak to peak is not 100hp peak to peak. There may be areas in the RPM range where the truck makes an increase of 100rwhp. However, I have a hard time believing it is common place enough for a person to make 350rwhp with a baby cam on a 5.3 that we should be leading the OP to expect it to happen.

calboi

iTrader: (2)

we can let this thread go now i ordered 243 heads with pac springs and bigger cam yesterday so....