38KV

Anyone know the height difference between a stock 9.800” block with GM 990 heads and a Dart 10.200” block with Dart Pro 1 heads? (from crankshaft centre to exhaust ports)

I suppose the Dart combo will be about 1” taller, but I need to know exactly.

ratman

i think is about 3/4 of an inch cuz its on a 45* angle, i had trouble fitting my exhaust and had to mill material off the maniflod flanges to make it fit. what type of exhaust are you running.

ratman

i went from 9.8 block and oem heads to 10.2 block and am 1/2 raised ports heads.

38KV

I'm running tubular headers.

The current set up is 9.800" blocks with GM 990 heads and TRS's, but I'm going with tall deck 572's and SSM#6's.
As you can see in the pic there's no more headroom for the headers, so I try to figure out if it's possible to get the X-dimension I want,
and I don't want to lower the motors more than I really need.
My goal is to lower the motors exactly as much as the Dart combo are taller than my current motors.

Thanks for your reply ratman.

ratman

my issue was room to get the ex manifolds to fit between the engines. you like you have plenty of room between em. what drives came off the boat?

38KV

TRS's

19" X-dimension.

ratman

the sixes should be a lot shorter than the trs, you should have plenty of head room

38KV

Yeah, the sixes are 5.55" shorter, but the prop shafts should also be a lot higher than the TSR's.

The #6's prop shafts will be 1/2" below the running surfaces if I lower the motors 3/4".