496 Stroker/Dart Pro1 Heads
 

Anyone running Dart Pro1 Heads?
I'm thinking about putting them on my 454s +30over
310cc intake/119cc chamber
2.25/1.88valves
I'm toying with the thought of turning my engines into 496 strokers.
Presently 5.88/6.10 112centerline roller cam
Anyone have experience with either Pro1 heads or 496 strokers?
Dennis

The stock heads on a 454Mag flow pleanty for a 454ci motor...you won't see much there in power gains unless your raising your cr to like 9:1 with the alum. Darts.
What exhaust system are you running now?

Back4More,

The compression ratio presently is 9.6:1 with TRW'S
Since I droped a valve at the C.O.PS. run I want to go with 9.6:1 SRP piston's with a quarter stroke crank aka:496ci
Intake is a Victor JR./1" spacer with a Nickerson 960 on it.
Exhaust is Stainless Marine.
Dennis

The WETTE VETTE has a 13.2:1 compression 496" Chev. with fully ported 325 Pro 1 Darts. It also has a stage 5 Nickerson 1050 Dominator, CMI exh, Merlin intake, full MSD, and a Comp solid roller cam 272/280 @ .050 with .714" lift. It runs pretty good.:cool: The stroker crank with 6.385" rods and the appropriate pistons results in a very good torque motor that works well in boats. Take a ride to LaPorte sometime and check it out.

35Lightening,

If Pro-1's are what you want then you should go with the 310cc head that Dart offers in the Pro-1------Do NOT go any larger! I run the 310's on my 540's.

35lightning,
Dan was saying it might have been a rocker or something at the lunch stop...sorry to hear it wasn't.
Maybe Bruce at Wolffie's could set you up.

My engine is currently on the dyno and is very close to what you are talking about. 454 @ 60 over 4.25 stroke w/6.385 rod = 496ci. I have the Dart Pro1 heads that have been worked to remove casting flash without enlarging the ports. I am using JE/SRP pistons for a compression ratio of 10.1 to 1. I am using the 731 crane cam which I don't remember the specs on at the moment. Those are the main features of the long block but a lot of other little things have been done. I am using the Arizona Speed & Marine EFI which is like the HP500efi but I am using larger injectors and throttle body. We are still making adjustments but prelim. #'s on dyno are: 590ft/lbs @ 3800rpm and the torque doesn't really drop until about 5400rpm (560ft/lbs). This is all designed to work with 92 oct. pump gas.

Todd

KAAMA
 

Do you think my boat would be faster with 310's or the 325's that I am running. I have seen 97.8 MPH at 6300 RPM for a best GPS top speed turning a 29 pitch Spinelli through 1.5 gears. I like this subject and want everyone's opinion. Oh ya the throttle response and acceleration are pretty awesome the way the motor is set up now.

Back4More,

I was at the marina pulling off the other head and I had a conversation with a friend that's into cars.
He suggested Bruce Wolff in New Buffalo for my machine work.
I believe that KAAMA had given me Wolff's phone number in a previous post....Thanx

Dennis

panchangalpina,

My cam is a crane 139631.
I think the 731 is close to what I'm running.
I spoke to a shop today that suggested that I use SRP
pistion #142991 which is a dome 10.2:1 at 118cc
I would like to be at 9.6:1 - 9.5:1
They suggested to go to a .051 head gasket which would bring me to 9.7:1
Then take some off of the dome to bring me down to 9.6:1
OR use a .039 head gasket and take more off of the dome.
Is either of these a commom practice?