38 flat deck with 33o´s
 

anyone know how fast a flat deck 38 with 330 hp 454´s would go....wasnt that base power back in the day_

454 (basic motor) is corect but 330hp - i'm not shure. I think 454/420hp /TRS maybe 52-54 mph with this. With 330 you better go sailing ;)

I would say 55 to 60mph

You are talking a 12000 pound + boat with a 24 degree deadrise.

That's the same weight of the older Formula 34 PC (top speed mid 40's) but they also had much less dearise.

Another reference point is the Formula 272 SR1. It weighs in about half the weight and runs mid 60's with the 330's.

I think you would be in the 40's with a flat deck. Still would be a cool ride though and look/sound good at the docks.

mine 38 flatdeck " had " worn out 454's with TRS drives and ran 60 on the GPS speedo . the engines did have cams with carbs and were in bad shape on compression and valve springs were gone .

now we have just finished the new engines going on the dyno in a week , should be 800 hp range with 871 blowers and konrad drives .

ok how about 420 hp (good engines)

Its depending on the drives. With TRS i bet 52-54. With Konrads or Bravos run faster. Also depends of water - its a non steped bottom so you need churned water for good top speed.

FWIW.....I think you might see mid 60s with 420s.....maybe...a flat deck is a heavy boat with no transom notch...It would be a pig with 330s for sure. Hell twin 330s only push my 29 outlaw to 64 GPS and weighs half what a flat deck weighs....

38 Flat Deck
 

I know a guy had a 84 Flat Deck brand new with 400's (Really 370's) right out of the box.........56 MPH Tops. Probably would have gone a little faster as is only had the old style Clevers on it.

My Mistress has around 480 hp and runs 64.8 best so far...

I would guess...

flatdeck with 330's 48-50 best, nowhere near 60, I have no idea where that comes from....

flatdeck with 420's I would guess 55-57 tops in good water...

mistress with stock 400/420 normally run 60-62